[MVOa  XNVlcT  3XVXS 
 
 Technical  Series  No.  21. 
 
 U.  S.  DEPARTMENT  OF  AGRICULTURE, 
 BTJREj^xj  OF  entom:oi^o&y. 
 
 L.  0.   HOWARD,    Entomologist  and  Chief  of  Bureau. 
 
 SYNOPSIS,  CATALOGUE,  AND 
 BIBLIOGRAPHY  OF 
 
 NORTH  AMERICAN  THYSANOPTERA, 
 
 WITH  DESCRIPTIONS  OF  NEW  SPECIES. 
 
 UBRARY       _^ 
 BY    ^T  ATE  PLAIW  BOARD 
 
 DUDLEY  MOULTON, 
 
 Deputy  State  Commissioner  of  Horticulture  for  California. 
 
 Issued  June  13,  1911. 
 
 WASHINGTON: 
 
 GOVERNMENT    PRINTING   OFFICE. 
 
 1911. 
 
BUREA  U  OF  ENTOMOLOG  Y. 
 
 .  ;   L,  O.  Howard,  Entomologist  and  Chief  of  Bureau. 
 =4/1/   ■  9:  .^-^ARLATT,  Entomologist  and  Acting  Chief  in  Absence  of  Chief 
 R.  S.  Clifton,  Executive  Assistant. 
 W.  F.  Tastet,  Chief  Clerk. 
 
 F.  H.  Chittenden,  in  charge  of  truck  crop  and  stored  product  insect  investigations 
 A.  D.  Hopkins,  in  charge  of  forest' insect  investigations. 
 W.  D.  Hunter,  in  charge  of  southern  field  crop  insect  investigations 
 F.  M.  Webster,  in  charge  of  cereal  and  forage  insect  investigations. 
 A.  L.  QuAiNTANCE,  in  charge  of  deciduous  fruit  insect  iywestigations. 
 E.  F.  Phillips,  in  charge  of  bee  culture. 
 
 D.  M.  Rogers,  in  charge  of  preventing  spread  of  moths,  field  work. 
 RoLLA  p.  Currie,  in  charge  of  editorial  work. 
 Mabel  Colcord,  librarian. 
 2 
 
LETTER  OF  TRANSMIHAL 
 
 U.  S.  Department  of  Agriculture, 
 
 Bureau  of  Entomology, 
 
 Washington,  D.  C,  December  13,  1910. 
 Sir:  I  have  the  honor  to  transmit  herewith  the  manuscript  of  a 
 bulletin  to  be  entitled  '^  Synopsis,  Catalogue,  and  Bibliography  of 
 North  American  Thysanoptera,  with  Descriptions  of  New  Species." 
 
 During  the  past  few  years  the  order  Thysanoptera  in  America  has 
 been  the  subject  of  increased  study  by  entomologists,  not  only  on 
 account  of  the  extreme  interest  attaching  to  the  insects  themselves, 
 but  also  by  reason  of  the  considerable  importance  which  several  of 
 the  species  have  attained  as  pests  of  horticultural  and  other  crops. 
 Mr.  Moulton,  while  in  the  employ  of  this  bureau,  was  a  part  of  the 
 time  engaged  in  a  study  of  two  very  destructive  species  in  California, 
 namely,  the  pear  thrips  {Euthrips  pyri  Daniel)  and  the  orange  thrips 
 {Euihrips  citri  Moulton),  and  the  present  paper  is  an  outgrowth  of 
 data  and  specimens  collected  during  his  investigation  of  these  insects 
 for  the  bureau. 
 
 An  up-to-date   synopsis   and   catalogue   of   the   Thysanoptera  is 
 greatly  to  be  desired  and  will  be  of  much  use  to  students  of  this  order. 
 I  would  therefore  recommend  the  publication  of  this  paper  as  Tech- 
 nical Series  No.  21  of  the  Bureau  of  Entomology. 
 Respectfully, 
 
 L.  O.  Howard, 
 CTiief  of  Bureau. 
 Hon.  James  Wilson, 
 
 Secretary  of  Agriculture. 
 
 3 
 
CONTENTS. 
 
 Page. 
 
 Introduction 9 
 
 Classification  of  North  American  Thysanoptera 10 
 
 Key  to  the  suborders  and  families 10 
 
 Key  to  the  genera 11 
 
 Key  to  the  species 13 
 
 Catalogue  of  North  American  Thysanoptera 21 
 
 Descriptions  of  new  genera  and  new  species 34 
 
 Bibliography  of  recent  publications 44 
 
 Index 47 
 
 5 
 
Digitized  by  the  Internet  Archive 
 in  2013 
 
 http://archive.org/details/synopsiscataloguOOmoul 
 
ILLUSTRATIONS. 
 
 Page. 
 Plate  I.  Fig.    1. — Erythrothrips  arizonse:    Head  and  thorax  of  female,  dorsal 
 
 \dew 40 
 
 Fig.    2. — Erythrothrips  arizonse:  Tip   of  abdomen  of  female,    dorsal 
 
 \'iew 40 
 
 -Fig.    3. — Erythrothrips  arizonse:   Tip  of  abdomen  of  male,  dorsal  view .  40 
 
 Fig,    4. — Erythrothrips  arizonse:     Eight  fore  wing 40 
 
 Fig.    5. — Erythrothrips  arizonse:    Maxillary  palpus 40 
 
 Fig.    6. — Erythrothrips  arizonse:  Left  antenna 40 
 
 Fig.    7 . — Erythrothrips  arizonse:    Larva 40 
 
 II.  Fig.    8. — Orothrips  kelloggii:    Right  antenna 40 
 
 Fig.    9. — Orothrips  Jcelloggii  yosemitii:    Right  antenna 40 
 
 Fig.  10. —  Thrips  magnus:    Head  and  prothorax  of  female 40 
 
 Fig.  11. — Thrips  magnus:     Right  fore  wing 40 
 
 Fig.  12. — Euthrips  citri:     Head  and  prothorax  of  female 40 
 
 Fig.  13. — Euthrips  citri:    Tip  of  abdomen  of  female 40 
 
 Fig.  14. — Euthrips  citri:     Right  antenna  of  female 40 
 
 Fig.  15. — Euthrips  citri:     Right  fore  wing 40 
 
 III.  Fig.  16. — Echinothrips  mexicanus:     Head  and  thorax  of  female,  dorsal 
 
 view 40 
 
 Fig.  17. — Echinothrips  mexicanus:    Tip  of  abdomen  of  female,  dorsal 
 
 view 40 
 
 Fig.  18. — Echinothrips  mexicanus:     Right  fore  wing  of  female 40 
 
 Fig.  19. — Echinothrips  mexicanus:    Right  antenna 40 
 
 Fig.  20. — Euthrips  alhus:     Head  and  prothorax  of  female,  dorsal  view .  40 
 
 Fig.  21. — Euthrips  alhus:    Tip  of  abdomen  of  female,  dorsal  view 40 
 
 Fig.  22. — Euthrips  alhus:    Right  fore  wing 40 
 
 IV.  Fig.  23. — Euthrips  parvus:    Head  and  thorax  of  female,  dorsal  view. .  40 
 Fig.  24. — Euthrips  parvus:    Tip  of  abdomen  of  female,  dorsal  view. .  40 
 
 Fig.  25 . — Euthrips  parvus:     Right  fore  wing  of  female 40 
 
 Fig.  26. — Euthrips  helianthi:    Head  and  prothorax  of  female,  dorsal 
 
 \dew 40 
 
 Fig.  27. — Euthrips  helianthi:    Tip  of  abdomen  of  female,  dorsal  view.  40 
 
 Fig.  28. — Euthrips  helianthi:     Right  antenna  of  female 40 
 
 Fig.  29. — Euthrips  helianthi:     Right  fore  wing 40 
 
 Fig.  30. — Euthrips  alhus:     Right  antenna  of  female 40 
 
 V.  Fig.  31. — Anaphothrips  zese:    Head  and  prothorax  of  female,  dorsal 
 
 view 40 
 
 Fig.  32. — Anaphothrips  zese:    Tip  of  abdomen  of  female,  dorsal  view.  40 
 
 Fig.  33. — Anaphothrips  zese:     Right  fore  wing 40 
 
 Fig.  34. — Anaphothrips  zese:     Right  antenna  of  female 40 
 
 Fig.  35. — Anaphothrips  tricolor:    Head  and  prothorax  of  female,  dorsal 
 
 view 40 
 
 7 
 
8  KOBTH   AMERICAN    THYSAXOPTERA. 
 
 Plate  V.  Fig.  S6.~AnapMrips  tricolor:    Tip  of  abdomen  of  female,  dor.al  "'""'' 
 
 View 
 
 pf  l'--i^^Pl'f\P'i^color:    Right  fore  wing  of  female 40 
 
 VT    l'^-f^-~i''^P^^i^'''P'i'^^^^       Right  antenna  of  female....  '         40 
 
 \  I.  Fig.  39.-Tnchothrips  richer:     Head  and  prothorax  of  female/dorsal 
 
 view 
 
 Fig.  40.-  Trichothrips  ruber:    Tip  of  abdomen,"  do'r^^al  "vVo^v 40 
 
 Fig.  41 -Trichotkrips  ruber:    Right  antenna  of  female         40 
 
 t  ig.  42. -Cephalothrips  errans:     Head  and  prothorax  of  female  dorsal 
 ^^ew ' 
 
 Fig.  43. -Cephalothrips  errans:    Tip  of  "abdomen  "of"  "femal"e  "  "dorsal        ^^ 
 view ' 
 
 Fig.  44.-Cephalothrips  errans:    Right"anienna"of  fem"ale 40 
 
 Fig.  4o.-Cryptothrips  californicus:     Head  and  prothorax  "of"  fem"a"l"e" 
 dorsal  view ' 
 
 Fig.  4Q.~Cryptothrips  californicus:  "  Ti"p  of  ab"do"m"e"n  of  femal"e  "dorsal        ^^ 
 
 view 
 
 40 
 
SYNOPSIS,  CATALOGUE,  AND  BIBLIOGRAPHY  OF  NOPxTH 
 AMERICAN  THYSANOPTERA,  WITH  DESCRIPTION  OF 
 NEW  SPECIES. 
 
 IK"TRCDUCTION. 
 
 The  many  recent  publications  on  American  thrips,  and  especially 
 the  descriptions  of  new  species  with  their  added  notes,  have  con- 
 stantly impressed  the  writer  with  the  need  of  a  catalogue  of  these 
 alreadj^  kno\\Ti  species,  w^ith  references  to  their  habitat  and  food  plants 
 and  to  notes  on  their  life  history.  The  writer  is  also  impressed  with 
 the  need,  for  future  workers,  of.  a  uniform  method  in  describing  new 
 species. 
 
 Several  English  and  European  entomologists  have  published 
 extensively  on  European  thrips,  but  it  is  only  within  the  last  decade 
 that  American  writers  have  given  more  than  passing  notice  to  these 
 insects.  Several  species  of  injurious  thrips,  in  both  the  East  and 
 West,  have  been  carefully  studied,  and  these  economic  problems,  it 
 seems,  have  been  largely  the  incentive  for  the  other,  the  systematic, 
 work.  The  grass  thrips  {AnapJiotlirips  striatus  Osborn),  the  straw- 
 berry thrips  (EutJirips  tritici  Fitch),  the  onion  thrips  {Thrips  tabaci 
 Lindeman),  the  tobacco  thrips  (Euthrips  fuscus  Hinds),  the  green- 
 house thrips  (Heliotkrips  hsemorrhoidalis  Bouche),  the  bean  thrips 
 {Heliothrips  fasciatus  Pergande),  the  orange  thrips  {Euthrips  citri 
 j.loulton),  and  lastly  the  pear  thrips  {EutJirips  pijri  Daniel)  are  all 
 examples  of  what  serious  pests  this  group  includes.  Already  many 
 agents  of  the  Bureau  of  Entomology  of  the  United  States  Depart- 
 ment of  Agriculture  and  various  State  and  county  workers  have  spent 
 much  time  and  money  in  learning  the  habits  of  these  several  inju- 
 rious forms.  California,  unfortunately,  harbors  all  of  the  above- 
 mentioned  species  except,  so  far  as  we  know,  the  tobacco  thrips. 
 
 Messrs.  Hood,  Shull,  Franklin,  and  D.  L.  Crawford  have  published 
 extensively  on  these  insects  since  the  monograph  by  Dr.  W.  E.  Hinds 
 appeared.  The  waiter  also  laiows  of  others  who  are  collecting  thrips 
 and  preparing  manuscript  on  description  of  new  species.  It  seems 
 opportune,  therefore,  for  the  sake  of  future  workers,  that  a  uniform 
 method  of  describing  species  be  adopted.     The  writer,    therefore, 
 
 9 
 
10  XORTII    AMERICAN    THYSAXOPTEEA. 
 
 inclu.les  an  outline,'  which  has  been  found  most  satisfactorv  in  liis 
 own  work. 
 
 Thrips  are  such  minute  insects  that  it  is  necessan-  for  accurate 
 
 get  the  best  results  by  treating  them  in  the  foUo^^-ing  war:  The  thrips 
 should  be  col  ected  and  killed  by  dropping  them  dir^ctlv'into  75  S 
 percen  alcohol;  they  should  be  dehydrated  bv  passing  them  succes- 
 sively hrough  90  per  cent,  95  per  cent,  and  absolute  alcohol,  and  then 
 cleared  in  xylol  or  cedar  oil,  and  mounted  in  balsam.  One  speci  en 
 only  should  be  placed  under  a  cover  glass;  but  by  using  smal" 
 coyerglasses,  two  can  be  placed  side  by  side  on  a  single  shde.  GlycTrin 
 ]elly  mounts  are  not  to  be  desired.  ^ 
 
 The  present  paper  includes  118  species  of  known  American  thrins 
 which  are  variously  divided  among  40  genera.  De'^^tions  fo 
 genera,  10  species  and  1  variety  are  herewith  presented.  The 
 bibliography  includes  only  references  to  recent  publications. 
 
 CIASSIFICATION    OP   NOETH   AMEEICAN    THYSANOPTEEA. 
 
 KEY  TO  THE  SUBOEDERS  AND  FAMILIES. 
 
 I.     SUBORDER  TEREBRANTIA. 
 
 Pem»Io  with  a  sawlike  ovipositor.    Terminal  abdominal  segment  of  female  conical 
 
 and  of  male  broadly  rounded.     Wings  usually  present;  fore  pair  strong "st 
 
 BcopicTa'r         ^^"-''--'"P^d  veins;  membrane  of  win„^  with  micro: 
 
 a.  Antenna,  with  nine  segments.    Fore  wings  broad  and  rounded  and  with  promi- 
 nent  ring  veins  and  cross  veins.    Ovipositor  upcurved. 
 
 «-.  An^nn.  With  seven   eight,  nine,  or  ten  s^^et^^'  A^n^f  pferr^: 
 
 ing^when  present  usually  narrow  and  pointed  at  tips."  Ovipositor  dow,!- 
 
 (^O  Family  Thripid.e. 
 
 Name.  '  ^''''^^  Followed  in  Describing  Thvsanoptera 
 
 length.    .Note  any  varlatlo™  ^  '""^"''  '"'™'""''  '™8«'  "'  ^'■'S""'"'''  '"  '"i<^rom.  lolal 
 
 Oeneral cilm,  with  wiriations. 
 
 'pZt  'iT'T""™  ''"■•  """*  "™''''  <='"'<"''^)'  markinss,  spinrs. 
 ^^.,»««,.  comparative  size,  shape;  »a..i,tary  ,.al„„s,  s„a„e,  so.„,o,„.;  ,„,..„  „.„„,,  3„„„.  ,„^. 
 
 Aiemnoraz.  hhaiio,  conipurativo  size,  color.  ,     lui. 
 
 Mttathorai  or  ptirthorai:  Ditto. 
 
 Legs:  Shafc,  markings  of  claws  or  spines,  color. 
 
 pf^s,:;;;%;^u;::;:^;-:-;:~-^^         >—. 
 
 ^U7nher  o/spccnnens  from  whici.  dpscribo.l  «i"ni.i(la  . 
 
 Habitat. 
 
 Food  plants. 
 
 Notts:  IncludiriK  tiino  of  year  whon  a.i.ilfs  arc  taken 
 
KEY   TO   THE   GENERA.  11 
 
 II.     SUBORDER  TUBULIFERA. 
 
 Female  without  sawlike  ovipositor.  Terminal  abdominal  segment  tubular  in  both 
 sexes.  Wings  usually  present;  fore  pair  only  with  a  rudimentary  median 
 longitudinal  vein;  membrane  of  wings  without  microscopic  hairs.  Antennae 
 with  eight  segments,  or  sometimes  only  seven. 
 
 (C)  Family  Phlceothripid^. 
 
 KEY  TO  THE  GENERA. 
 A.     Family  ^OLOTHRiPiD.E. 
 
 1.  All  segments  of  antennae  freely  movable  and  diminishing  in  size  gradually  toward 
 
 the  tip. 
 a.  Maxillary  palpi  with  seven  or  eight  segments;  wings  with  bands. 
 6.  Wings  with  dark  cross-bands;  maxillary  palpi  with  seven  segments. 
 
 (1)  Orothrips  Moulton. 
 y.  Wings  with  dark  longitudinal  bands  along  posterior  margin;  maxilliary  palpi 
 
 with  eight  segments (2)  Erythrothrips  new  genus. 
 
 a\  Maxillary  palpi  three-segmented,  labial  palpi    two-segmented;  wings   without 
 dark  cross-bands (3)  Ankothrips  Crawford. 
 
 2.  Last  four  segments  of  antennae  closely  united  and  together  shorter  or  a  little  longer 
 
 than  the  fifth;  maxillary  palpi  three-segmented,  labial  palpi 
 four-segmented (4)  ^olothrips  Haliday. 
 
 B.     Family  Thripid^. 
 
 1.  Antennae  with  seven  segments. 
 
 a.  Body  with  deeply  reticulated  structure;  wings  broad,  reticulated,  and  without 
 
 front  fringe (5)  Parthenothrips  Uzel. 
 
 a\  Body  without  reticulated  structure;  wings  pointed,  front  fringe  present. 
 
 h.  Maxillary  palpus  with  two  segments (6)  Baliolhrips  Haliday. 
 
 V.  Maxillary  palpus  clearly  with  three  segments (7)  Thrips  Linnaeus._ 
 
 2.  Antennae  with  eight  segments  (with  six  segments  in  Aptinothrips  rufus  var.  con- 
 
 natticornis) . 
 a.  Body  with  reticulated  structure,  wings  present. 
 
 b.  Last  segment  of  antenna  long  and  slender  and  very  much  longer  than  segment  7. 
 c.  style  longer  than  segment  6;  prothorax  much  shorter  than  head;  spines  on 
 
 veins  pointed (8)  Heliothrips  Haliday. 
 
 (/.  style  shorter  than  segment  6;  prothorax  about  as  long  as  head;  spines  on 
 wings  long,  strong,  and  with  dilated  tips. 
 
 (9)  Echinothrips  new  genus. 
 y.  La-st  segment  of  antenna  not  noticeably  long  and  slender  and  only  a  little 
 longer  than  segment  7;  style  shorter  than  segment  6. 
 
 (10)  Dictothrips  Uzel. 
 a\  Body  without  reticulated  structure  (except  in  Sericothrips  reticulatus) . 
 
 b.  Abdomen  having  a  silky  luster  (when  living  or  in  dried  condition),  because 
 of  covering  of  extremely  small  hairs. 
 
 (11)  Sericothrips  Haliday. 
 y.  Abdomen  without  small  hairs  giving  it  a  silky  luster. 
 
 c.  Last  two  antennal  segments  longer  than  the  sixth (12)  Raphidothrips  Uzel. 
 
 (/.  Last  two  antennal  segments  shorter  than  the  sixth. 
 d.  Terminal  segment  of  abdomen  with  a  pair  of  extremely  stout,  short  spines 
 
 near  the  tip  above (13)  Limotkrips  Haliday. 
 
 d\  Terminal  abdominal  segments  without  stout  spines. 
 
12  ^'OETH    AJIEEICAN    THYSAXOPTEBA. 
 
 ..  Autoun*  with  .eoond  segment  drawn  „u.  into  an  acte  process  on  outer 
 
 :nfok':;:.'^r  -^-^"^ ''-'  -1 ;;"'  ™^" '"  "- 
 
 /.  Ocent  -^^^^^^n^^^on  the  end  of  „e  a.do.en  .Uort 
 
 ''•  """itiTonT-r  ^-"™<'>------ref^^^^ 
 
 ,„.  ,      ;'^^^>  ^o^"  and  proportionately  stout 
 9.  ^^  ith  a  long  spine  at  the  middle  of  each  side  of  prothorax;  spines  on 
 
 body  and  wings  very  strong  ^^R\  e    z  .i  •      J; 
 
 9^.  ^nthon,  a  .pine  at  ti Jntiddle  of  fach'side  o/Stt"'^  '''"'^■ 
 ».  Ov,po.or  long  and  extending  eonsiderabl,  C^Ttip  of  abdo- 
 
 3.  Antennae  with  apparently  nine  sec^ments ^  '^'  Targioni-Tozzetti. 
 
 :7"""-^-""""ttiri!;nSr^^-'^ 
 
 4.  Antenna  with  clearly  nine  segments;  sometimes  apparentljte^''"^'"*"^'  ^''"^'■ 
 
 n      r.      ■,     ^  ^^^'  Helcmhrips  Hood 
 
 (-.     l-amily  Phlosothripid^ 
 
 1.  Head  abont  a.  iong  as  jHdeand  eiU.er  sbor.er  or  on,-  a  .ittie  ionger  t.an  the  pro- 
 
 a.  Antennae  with  seven  segments 
 
 *■  ^"'™""  °"°  ""'^  Zo^f  '--  -  'r  "^  '"'^■'  '^-^^  ---l^d  in  front  and 
 
 *'.  Antenna  two  and  one-haif  times  aV  long  a^  he^d;' he^derngZ-'lti 
 segments  of  antenna,  widely  separated  and  pi:ced  ;,,  the 
 prominent  anterior  angles  of  the  head 
 
 _^  constricted  m  the  middle  °     '       ^ 
 
 .  Mou.h-oone  no.  longer  than  its  breadth  at  base;  labrum  narrowed  toward 
 
 he  np  but  not  sharply  pointed;  fore  femora  but  JlZ'w 
 
 In -rrlid^  ''-'  "'  -^'-  "if-  large  eurveJC: 
 c-.  Mouth-cone  reac.i,„^^^ 
 
 6-^.  Head  not  narrowed  in  front ^^'^^  Eurythrips  Hinds. 
 
 :^.T;;-:,:;:::;;;:;,:~^;-r^''"''""'- (^.x„...,„„.,, 
 
 e.  Segment  8  of  antenna  shorter  than  segment  7        f'K^  r,-,',.;,  „;   •      ,r    , 
 e'.  SegmentSof  antenna  very  s,en<ler and  noUeJably  ttrU^S^^; 
 
 (29)  Plcclothrips  Ilood. 
 
KEY   TO   THE   SPECIES.  13 
 
 2.  Head  considerably  longer  than  wide  and  longer  than  the  prothorax. 
 a.  Head  less  than  twice  as  long  as  wide. 
 
 b.  Fore  femora  each  with  a  tooth  on  the  inner  side  near  the  end. 
 
 (30  Acanthothrips  Uzel. 
 y.  Fore  femora  unarmed, 
 c.  Wings  wanting  or  reduced  to  pads  (or  very  short  and  weak  if  fully  developed). 
 d.  Mouth-cone  shorter  than  its  width  at  base,  labrum  not  narrowed  in  the 
 
 middle  and  with  a  blunt  tip (31)  Cephalothrips  Uzel. 
 
 d^.  Mouth-cone  as  long  as  its  width  at  base,  labrum  sharply  pointed. 
 
 €.  Cheeks  with  spine-bearing  warts (32)  Malacothrips  Hinds. 
 
 e^.  Cheeks  without  spine-bearing  warts (33)  Neothrips  Hood, 
 
 (/.  Wings  fully  developed. 
 
 d.  Wings  constricted  in  the  middle. 
 e.  Mouth-cone  broadly  rounded  at  the  end;  wangs  only  slightly  narrowed 
 
 in  the  middle (34)  Cryptothrips  Uzel. 
 
 e^.  Mouth-cone  constricted  at  the  end;  wings  considerably  narrowed  in 
 the  middle  and  having  somewhat  the  shape  of  a  sole. 
 /.  Head  nearly  twice  as  long  as  wide;  mouth-cone  reaching  nearly  across 
 
 presternum (35)  Leptothrips  Hood^ 
 
 /^.  Head  only  a  little  longer  than  broad;  mouth-cone  reaching  only  to 
 
 middle  of  presternum (36)  Zygothrips  Uzel. 
 
 d\  Wings  of  equal  width  throughout. 
 
 e.  Cheeks  with  a  few  very  small  warts,  each  of  which  bears  a  small  spine, 
 
 (37)  Phloeothrips  Haliday, 
 
 e^.  Cheeks  without  such  warts (38)  Liothrips  Uzel. 
 
 a'.  Head  more  than  twice  as  long  as  wide;  individuals  very  large. 
 
 b.  Antennae  one  and  one-sixth  to  one  and  one-half  times  as  long  as  head;  fore 
 tarsi  of  females  unarmed,  of  males  each  armed  with  a  tooth; 
 without  prominent  spines  along  fore  margin  of  prothorax. 
 
 (39)  Idolothrips  Haliday. 
 6^,  Antennae  twice  as  long  as  head;  color  brown  to  dark  brown;  fore  tarsi  not. 
 armed ;  four  prominent  spines  along  fore  margin  of  protho- 
 rax, two  of  which  stand  on  the  outer  angles. 
 
 (40)  Megalothrips  Heeger, 
 
 KEY  TO  THE  SPECIES. 
 
 (1)  Genus  Orothrips  Moulton. 
 
 1.  Segment  2  of  antenna  quite  uniform  brown;  segment  3  not  constricted  in  the  middle; 
 
 sense  areas  on  segments  3  and  4  elongate. 
 
 (1)  Orothrips  hclloggii  Moulton. 
 
 2.  Segment  2  of  antenna  brown  at  base,  yellow  at  tip;  segment  3  constricted  in  the 
 
 middle;  sense  areas  on  segments  3  and  4  ovoid. 
 
 (2)  Orothrips  kelloggii  yosemitii,  new  variety, 
 
 (4)  Genus  ^olothrips  Haliday. 
 
 1,  Fore  wings  with  dark  cross-bands. 
 a.  White  band  around  abdominal  segments  1  and  2;  last  four  segments  of  antennae 
 much  longer  than  fifth. 
 6,  Segments  2  and  3  of  abdomen  white;  wings  with  cross- veins. 
 
 (5)  Molothrips  bicolor  Hinds. 
 ¥.  Segments  1,  2,  and  posterior  half  of  3  white;  wings  without  cross- veins. 
 
 (6)  Molothrips  vespiformis  Crawford. 
 
a. 
 
 I'i  :N^0KTH   AMERICAN    THYSANOPTEEA. 
 
 «.  Without  white  band  around  first  two  abdominal  segments;  last  four  segments  of 
 antennae  approximately  as  long  as  the  fifth  alone. 
 
 Each  fore  wing  with  dark  longitudinal  band  along ^sft^Sr'""  ''^^^^^• 
 I.  ^^  ith  veins  in  anterior  ^Wngs  normal  as  in  most  species  of  this  genus. 
 
 a'    Without  vp,-n^  i..  .,.f^  •         •  ^^^  ^olothrips  kuwanaii  Moulton. 
 
 .      ithout  ^  em.  m  anterior  wings (9)  ^olothrips  longiceps  Cmwford. 
 
 (7)  Genus  Thrips  Liimgeus. 
 1.  Head  considerably  wider  than  lon^^ 
 a.  Body  color  dark  bmwn.  ,horax\nd  other  parts  omnge-tinted.  inner  crescents 
 borfenng  ocelh  omnge-red;  individuals  large.  ab;ut  1.25  mm  " n 
 
 6.  Wings  light  brown,  with  lighter  colored  area  near  base. 
 
 6'.  Wings  uniform  dark  brownto  brown  n  sIn  Jit' ""^™"'*  """"""■ 
 
 «^Bodyco,orHghtye..owtolightbro.n;rb;o;™!fnL?c"^^^^^^^^^^ 
 
 light  brown;  body  length  about  1  mm  ° 
 
 6.  Ocelh  subapproximate;  posterior  longitudinal  vein  of  fore  wing  with  about 
 fourteen  to  seventeen  regularly  placed  spines. 
 
 longitudinal  vein  bearing  about  seven  spines. 
 2.  Head  about  as  long  as  .Wde.  ^^^^  ^^''^'  abdominalis  Crawford, 
 
 a.  Color  uniform  light  lemon-yellow  np\  tj,  -      7, 
 
 (1' )  Thrips  perpkxus  Beach. 
 
 (8)  Genus  Heliotiirips  Haliday. 
 
 1.  All  tibitc  yellow.  "^ 
 
 a.  Antenna,  nearly  three  times  as  long  as  head;  wings  shaded  brown,  with  two  more 
 or  less  distinct  whitish  cross-bands  and  whitish  at  tip 
 
 «'.  Antenn.  about  t..ce  as  long  as  head;  wings  ailf^S/dJlSttrn 
 
 2.  Middle  and  hind  tfbirbrown ^'^^  Udiothrips  h,;norrhoidalis  Bouch^. 
 
 a.  Antenna.  t--d  one-half  tiines  as  long  as  head,  segments  3  an<l  4  modioliform 
 "'     Vntenme  .  ™^  "f  ^  P^'P' ""■^''-^^'g'^ented. . .  (20)  IMioaripsfasciat„s  Pergan<^' 
 
 .  Antenna,  t-ce^as  kng  as  head,  .segments  3  and  4  fusiform;  maxillary  palA  two- 
 
 (21)  Ilcliothnpsfasciapain is  Hinds. 
 
 (11)  Genus  Sericothrips  Haliday. 
 1 .  Wings  fully  developed  or  rudimentary. 
 a.  Wings  fully  developed. 
 l^.  For.  wings  dusky  or  gray-brown  and  more  or  less  distinct  ly  marked  wi,  h  whitish 
 cro.ss-bands;  general  color  yellowish  to  dusky  <nay 
 
 inents  4,  o,  and  6  oi  abdomen,  which  are  almost  white. 
 
 (26)  Sericothrips  cingulatus  Hinds. 
 
KEY   TO   THP:   species.  15 
 
 2.  Wings  wanting. 
 
 a.  Body  very  dark  brown,  nearly  black;  pterthorax  yellow  to  yellow-brown;  legs 
 
 brown (27)  Sericothrips  apteris  Daniel. 
 
 a\  Body  nniforni  brown;  surface  of  body  strongly  reticulated;  legs  yellow. 
 
 (28)  Sericothrips  reticulatiis  Moulton. 
 af\  Body  and  legs  uniform  brown;  four  stout  spines  on  dorsal  side  of  segment  9. 
 
 (29)  Sericothrips  stanfordii  Moulton. 
 
 (14)  Genus  Chirothrips  Haliday. 
 
 1.  With  two  moderately  long  spines  at  each  hind  angle  of  prothorax;  two  longitudinal 
 
 veins  in  each  fore  wing;  fore  wings  gray-brown. 
 
 (31)  Chirothrips  manicatus  Haliday. 
 
 2.  With  one  moderately  long  spine  at  each  hind  angle  of  prothorax;  one  median  longi- 
 
 tudinal vein  in  each  fore  wing,  five  spines  on  apical  part  of  wing 
 where  second  vein  should  be (33)  Chirothrips  mexicanus  Crawford. 
 
 3.  Without  spines  at  hind  angle  of  prothorax. 
 
 a.  Abdomen  light  yellow (34)  Chirothrips  ohcsus  Hinds. 
 
 of.  Abdomen  light  brown (35)  Chirothrips  crassus  Hinds. 
 
 (18)  Genus  Euthrips  Targioni-Tozzetti. 
 
 1.  Without  prominent  spines  on  fore  angles  of  prothorax,  longitudinal  veins  not  regu- 
 
 larly set  with  spines. 
 a.  Head  noticeably  wider  than  long;  general  color  white  to  light  yellow  or  orange. 
 h.  Last  two  segments  of  antennae  rather  long  and  slender,  and  together  about  two- 
 thirds  as  long  as  segment  6 ;  wings  shaded  brown,  with  transparent 
 whitish  areas  near  base  and  at  tip;  ring  vein  and  longitudinal  veins 
 
 not  conspicuous (39)  Euthrips  orchidii  Moulton. 
 
 y.  Last  two  segments  of  antennae  not  noticeably  elongate  and  slender  and  together 
 about  one-half  as  long  as  segment  6. 
 c.  Ring  vein  and  at  least  a  part  of  fore  vein  conspicuous;  color  of  body  orange- 
 yellow. 
 d.  Wings  shaded  brown;  fore  part  of  longitudinal  vein  alone  conspicuous. 
 
 (40)  Euthrips  parvus,  new  species. 
 
 d\  Wings  not  shaded  brown;  both  longitudinal  veins  present,  with  three  or 
 
 four  scattered  spines  on  each,  one  of  which  stands.at  the  abrupt  ending 
 
 of  each  vein (41)  Euthrips  citri  Moulton. 
 
 </.  Ring  vein  and  longitudinal  veins  not  conspicuous ;  group  of  six  spines  on  basal 
 part  of  wing  where  anterior  vein  should  be  and  nine  on  outer  half 
 where  posterior  vein  should  be;  color  of  body  and  wings  clear  white, 
 outer  half  of  antennae  dark  brown. . .  (42)  Euthrips  albus,  new  species. 
 a^.  Head  about  as  long  as  wide;  general  color  brown,  thorax  sometimes  orange- 
 brown. 
 b.  Basal  segment  of  antennae  concolorous  with  head  and  with  segment  2;  wings 
 brown,  with  an  irregular,  somewhat  triangular  transparent  area 
 near  base;  two  long  prominent  spines  between  posterior  ocelli; 
 without  prominent  spines  along  posterior  margin  of  prothorax;  legs 
 brown,  concolorous  with  body,  except  tarsi,  which  are  lighter. 
 
 (43)  Euthrips  pyri  Daniel. 
 h\  Basal  segment  of  antennae  lighter  colored  than  head  and  segment  2;  wings 
 uniform  light  brownish-gray,  without  whitish  area  near  base. 
 
 (44)  Euthrips  ehrhornii  Moulton. 
 
 2.  With  spines  on  fore  angle  of  prothorax;  longitudinal  veins  set  regularly  with 
 
 spines. 
 
16  XORTH    AMERICAN    THYSANOPTERA. 
 
 a.  Fore  tibise  armed  at  end  with  tooth.  Females  dark  brown;  wings  brown,  with 
 whitened  area  near  base;  antennae  concolorous  with  head,  except 
 segment  3,  which  is  light  yellow. 
 
 (45)  Euthrips  ulicis  californicus  Moulton. 
 a\  Fore  tibia3  not  armed  with  tooth. 
 
 h.  Postocular  spines  wanting;  row  of  spines  along  anterior  margin  of  prothorax 
 either  wanting  or  at  least  not  conspicuous,  except  often  the  third 
 from  the  outer  margin. 
 c.  Antennae  uniformly  brown  to  dark  browTi,  concolorous  with  body;  wings 
 light  brown,  veins  prominent;  spines  brown,  twenty-three  on  fore 
 vein,  sixteen  on  hind  vein,  short  and  comparatively  stout;  white 
 longitudinal  area  near  base  of  wing.  .(4C)  Euthrips  minutus  Moulton. 
 cf.  Antennae  with  segment  3  yellowish,  4  and  5  light  gray-brown,  yellowish  at 
 base;  wings  gray-brown,  veins  not  prominent,  spines  on  wings  nor- 
 mally long  and  stout,  fourteen  on  fore  vein,  ten  on  hind  vein. 
 
 (\Yings  may  be  reduced  to  pads) (47)  Euthrips  fuscus  Hinds. 
 
 i/.  Postocular  spineS' conspicuous. 
 c.  General  color  uniformly  brown  to  dark  brown,  no  shading  of  orange;  antennae 
 with  segments  3,  4,  and  5  light  brown  to  yellow  and  shaded. 
 d.  Uniformly   dark  brown;  fore  wings  shaded  dark  bro^^Ti,   with  a  large 
 whitened  area  extending  across  wing  near  base;  spines  on  wings  all 
 
 dark  brown (48)  Euthrips  insularis  Franklin. 
 
 d^.  Color  yellowish  brown;  fore  wings  uniformly  shaded  with  gray. 
 
 (49)  Euthrips  nervosus  Uzel. 
 (/.  General  color  whitish  to  yellow  or  yellowish  to  brown,  no  shading  or  orange. 
 d.  Second  segment  of  antennae  with  a  double  spine-bearing  tubercle;  vertex 
 of  head  depressed;  anterior  ocellus  directed  forward. 
 e.  Color  uniformly  yellow;  surface  of  body  without  reticulation. 
 
 (50)  Euthrips  cephalicus  Crawford. 
 ef.  Color  uniformly  brown;  surface  of  body  reticulated. 
 
 (51)  Euthrips  cephalicus  reticulatus  Crawford. 
 d^.  Second  segment  of  antennae  without  double  spine-bearing  tubercle;  ver- 
 tex  of    head    not   depressed;  anterior   ocellus   directed    upward; 
 color  yellowish,  shaded  with  dusky  brown. 
 
 (52)  Euthrips  helianthi  new  species. 
 (/^.  General  color  light  yellow    to    yellowish    brown;    thorax  or  other  parts 
 
 decidedly  tinted  with  orange. 
 d.  Head  pale  lemon-yellow  to  light  yellowish  brown;  thorax  orange-yellow; 
 abdomen  brownish  yellow  to  brown;  segment  1  of  antenna  whitish 
 to  light  brown;  segment  2  dark  brown. 
 
 (53)  Euthrips  occidciitalis  Pergande. 
 d^.  General  color  brownish  yellow,  not  uniform;  thorax  orange-yellow;  seg- 
 ment 1  of  antenna  pale  yellow,  2  light  brown,  base  sometimes  yel- 
 lowish   (54)  Euthrips  tritici  Fitch. 
 
 d^\  General  color  brown  to  dark  brown:  thorax  orange-brown. 
 
 (55")  Euthrips  tritici  californicus,  new  variety. 
 
 (19)  Genus  AxArnoTHRirs  Uzel. 
 
 1.  Without  spines  on  posterior  angles  of  prothorax;  cheeks  straight;  surface  of  abdo- 
 
 men   not   faintly   cross-striated;  crescents  of  ocelli   bright   orange- 
 yellow  (5G)  .1  iiaphothrips  striutus  Osborn. 
 
 2.  With  one  stout  spine  on  posterior  angle  of  prothorax;  cheeks  arched;  surface  of 
 
 abdomen  distinctly  cross-striated',  crescents  of  ocelli  light  brown. 
 
KEY   TO   THE   SPECTES.  17 
 
 a.  Head  about  as  long  as  wide;  wings  shaded  gray-brown;  segments  5,  6,  7,  and  8 
 of  abdomen  without  comblike  arrangement  of  spines  along  posterior 
 margin;  color  uniformly  yellow  to  gray-brown. 
 
 (57)  Anaphothrips  hespei-us  new  species. 
 
 a\  Head  noticeably  wider  than  long;  wings  transparent;  segments  5,  6,  7,  and  8 
 
 of  abdomen  with  conspicuous  comblike  arrangement  of  spines;  color 
 
 of  head  and  prothorax  yellowish  or  orange-yellow,  abdomen  brown. 
 
 (58)  Anaphothrips  tricolor  new  species. 
 
 (21)  Genus  Heterothrips  Hood. 
 
 1.  Prothorax  twice  as  long  as  head;  antennae  with  apparently  nine  segments. 
 
 a.  Antennae  without  circles  of  distal  sensoria  on  segment  4;  segment  3  light  yellow, 
 palest  at  base;  segment  4  brownish,  palest  toward  base;  articulation 
 of  segments  brown,  not  clear.  Wings  brown,  paler  at  base.  Ante- 
 rior femora  shading  to  yellow  at  apex,  fore  tibiae  yellow,  shaded  with 
 brown  laterally;  tarsi  yellow (60)  Heterothrips  solids  Shull. 
 
 a\  Antennae  without  distal  circles  on  segment  4;  segments  1  and  2  slightly  lighter 
 than  body,  shaded  laterally  with  black;  segment  3  light  yellow, 
 with  a  narrow  subbasal  white  band;  distal  one-third  clouded  with 
 brown;  segments  4  to  9  uniform  light  blackish-brown  except  band 
 of  sensoria  on  segment  4.  Wings  blackish  browTi,  with  a  broad  white 
 band  near  base.  Legs  concolorous  with  body,  except  tarsi  and  distal 
 part  of  fore  tibiae,  which  are  yellow. 
 
 (61)  Heterothrips  arissevix  Hood. 
 
 2.  Prothorax  less  than  twice  as  long  as  head;  antennae  with  apparently  10  segments; 
 
 circles  of  sense  areas  on  segments  4  and  5  (coiTesponding  to  seg- 
 ments 3  and  4  of  other  species  of  Heterothrips);  segments  3  and  4 
 (corresponding  to  segment  3  of  other  species)  light  yellow;  all  others 
 dark  brown.     Wings  light  brown,  basal  one-sixth  clear. 
 
 (62)  Heterothrips  decacornis  Crawford. 
 
 (24)  Genus  Anthothrips  Uzel. 
 
 1.  Postocular  spines  wanting;  antennae  almost  uniformly  brown,  except  segment  3 
 
 and  base  of  4,  which  are  light  brown (65)  Anthothrips  niger  Osborn. 
 
 2.  Postocular  spines  well  developed. 
 
 a.  Segments  3  and  6  of  antennae,  eyes,  fore  tibiae,  all  tarsi,  and  other  lighter  parts  of 
 body  shaded  with  orange-yellow. . .  (66)  Anthothrips  verbasci  Osborn. 
 a^.  Intermediate  segments  of  antennae  and  other  light  parts  of  body  light  brown. 
 
 (67)  Anthothrips  variabilis  Crawford. 
 
 (26)  Genus  Eurythrips  Hinds. 
 
 1.  Width  of  abdomen  about  one  and  two-thii'ds  times  that  of  prothorax;  antennae 
 
 twice  as  long  as  head (69)  Eurythrips  ampliventralis  Hinds. 
 
 2.  Width  of  abdomen  about  one  and  one-fourth  times  that  of  prothorax;  antennae 
 
 twoand  one-half  times  as  long  as  head.  (70)  Eurythrips  osborni  Hinds. 
 
 (28)  Genus  Trichothrips  Uzel. 
 
 1.  Prominent  spines  on  body  with  blunt  or  dilated  tips;  most  forms  very  dark  brown 
 or  nearly  black  (except  T.  angusticeps) ,  usually  with  short  wings 
 (except  T.  longitubus). 
 a.  Each  fore  tarsus  armed  with  a  tooth;  antennae  about  one  and  two-thirds  times 
 as  long  as  head;  total  body  length  about  1.4  to  1.7  mm. 
 71924°— 11 2 
 
18  XORTH    AMERICAX    THYSANOPTEEA. 
 
 b.  Postocular  spines  very  short  and  not  conspicuous. 
 c.  Color  brown,  with  conspicuous  red  pigment  blotches;  mouth  cone  pointed 
 and   reaching  beyond   posterior  margin   of  prostemum;  segments 
 1  and  2  of  antennae  brown,  unicolorous  with  body. 
 
 (72)  Trichothrips  dens  Moulton. 
 y.  Postocular  spines  prominent. 
 c.  Postocular  spines  acute;  color  of  body  black;  mouth  cone  blunt,  short, 
 reaching  but  slightly  past  middle  of  prostemum;  segments  1  and  2 
 of  antennae  black,  segment  2  shading  to  lighter. 
 
 (73)   Trichothrips  brevicuralis  ShuU. 
 c\  Postocular  spines  prominent  and  nobbed  at  ends. 
 
 d.  Color  of  body  brownish  yellow,  shaded  with  brownish  black,  with  maroon- 
 colored  hypodermal  pigmentation;  mouth  cone  considerably  sur- 
 passing base  of  prostemum;  segments  1  and  2  of  antennae  paler 
 
 than  body  color (74)   Trichothrips  angusticeps  Hood. 
 
 d\  Color  of  body  brown  to  deep  brown,  with  maroon-colored  pigmentation; 
 mouth  cone  not  surpassing  base  of  prostemum;  segments  1  and  2 
 
 unicolorous  with  body (75)  Trichothrips  ruber  new  species. 
 
 a\  Fore  tarsi  not  armed;  body  length  about  1.8  mm.;  antennae  about  twice  as  long 
 as  head. 
 b.  Wings  fully  developed;  tibiae,  tarsi,  and  intermediate  segments  of  antcnncT 
 bright  lemon-yellow;  prothorax  two-thirds  as  long  as  head;  tube 
 
 fully  as  long  as  head (70)  Trichothrips  longitubus  Hood. 
 
 y.  Wings  short;  antennal  segments  1  to  3  yellowish-brown,  segments  4  to  8 
 black;  prothorax  about  as  long  as  head;  tube  slightly  shorter  than 
 
 head (77)  Trichothrips  buff^  Hood . 
 
 2.  Prominent  spines  on  body  acute;  most  forms  yellow-brown  (except  T.  ilex  which 
 may  be  almost  black);  antennae  about  twice  as  long  as  head;  all 
 rather  large  individuals,  about  1.7  mm.  or  more  in  length,  and  with 
 wings  usually  fully  developed  (except  T.  smithii,  which  is  without 
 wings  and  very  small,  about  1  mm.  in  length). 
 
 a.  Individuals  small  and  without  ocelli  or  wings (78)  Trichothrips  smithi  Hood. 
 
 a' .  Individuals  large;  wings  usually  fully  developed  (they  may  be  rudimentary 
 in  T.  americanus.) 
 b.  Each  fore  tarsus  armed  with  a  small  tooth. 
 c.  Small  stout  spines  on  head  borne  upon  small  warts;  tube  fully  as  long  as  head. 
 
 (79)   Trichothrips  beachi  Hinds. 
 (/.  Spines  on  head  not  borne  on  small  warts;  tube  shorter  than  head. 
 
 d.  Antennae  one  and  three-fourths  times  as  long  as  head;  tube  two-thirds  as 
 long  as  head;  total  length  about  2  mm.;  fore  tarsus  with  a  short, 
 stout  tooth;  wings  clear  white,  except  a  slightly  clouded  band  at 
 
 one-third  the  wing's  length (80)   Trichothrips  ambitus  Hinds. 
 
 d^.  Antennae  twice  as  long  as  head;  tube  three-fourths  as  long  as  head;  total 
 body  length   about   1.7   mm.;  fore  tarsi  with  a  very  small  tooth; 
 
 wings  clear  white (81 )   Trichothrips femoralis  Moulton. 
 
 d^^.  Antennae  slightly  more  than  twice  as  long  as  head;  tube  slightly  shorter 
 than  head;  total  body  length  about  1.7  mm.;  fore  tarsi  with  a  small 
 acute  tooth;  wings  light  gray-brown,  spotted  with  darker. 
 
 (82)   Trichothrips  americanus  Hood. 
 b\  All  tarsi  armed  each  with  a  small  tooth. 
 c.  Color  very  dark  brown,  almost  black;  all  tarsi,  tips  of  fore  tibi.'e,  and  seg- 
 ments 3  and  4  of  antennjc  shading  to  yellow;  sides  of  head  slightly 
 arched (83)   Trichothrips  ilex  Moulton. 
 
KEY   TO   THE   SPECIES.  19 
 
 c' .  General  color  similar  to  that  of  T.  ilex\  all  tarsi  gray-brown  to  brown;  anten- 
 nae brown,  with  base  of  segment  3  yellow. 
 
 (84)   Trichothrips  ilex  clumosa  Moulton. 
 
 (/'.  Color  brown  to  light  brown;  tarsi  light  brown;  antennae  concolorous  with 
 body,  except  segment  2  and  base  and  top  of  3,  which  arc  yellowish; 
 sides  of  head  nearly  parallel (85)   Trichothrij^s  tridentatus  Shall. 
 
 (30)  Genus  Acanthothrips  Uzel. 
 
 1.  Postocular  spines  wanting;  back  of  head  with  spine-bearing  tubercles;  antenna3 
 
 hardly  twice  as  long  as  head;  body  without  latero-dorsal  white 
 stripes. 
 a.  General  color  yellowish  brown;  antennae,  legs,  and  segments  8  and  9  of  abdo- 
 men banded  with  nearly  transparent  or  yellowish  white;  tube  bear- 
 ing a  circlet  of  eight  very  long  hairs. 
 
 (87)  Acanthothrips  magnafemoralis  Hinds. 
 a\  General  color  dark  brown,  without  white  bands  and  without  long  hairs  at  end 
 of  tube. 
 6.  A  distinct  white  fleck,  by  reflected  light,  on  dorsal  anterior  comers  of  all 
 abdominal  segments  except  the  two  basal  and  the  two  apical. 
 
 (88)  Acanthoihrips  nodicornis  Renter. 
 y.  Without  whitish  markings (89)  Acanthothrips  doanei  Moulton. 
 
 2.  Postocular  spines  long  and  pointed;  back  of  head  without  spine-bearing  tuber- 
 
 cles; antennae  about  one  and  one-fourth  times  as  long  as  head;  body 
 with  latero-dorsal  white  stripes  extending  from  posterior  margin  of 
 eyes  to  base  of  eighth  abdominal  segment, 
 
 (90)  Acanthothrips  albivittatus  Hood. 
 
 (31)  Genus  Cephalothrips  Uzel. 
 
 1.  General  color  yellowish  brown;  antennae  yellow,  shaded  with  brown;  all  femora 
 
 and  middle  and  hind  tibiae  brown;  all  tarsi  and  fore  tibiae  (except 
 at  base  outside)  pale  yellow;  body  length  1.48  mm.  (1.40  mm.  to 
 1.56  mm.) (91)  Cephalothrips  yuccse  Hinds. 
 
 2.  General  color  dark  brown;  antennae  dark  brown,  except  segment  3,  which  is  yel- 
 
 lowish brown  at  tip;  all  femora  and  bases  of  all  tibiae  brown;  tips 
 of  all  tibiae  and  all  tarsi  yellow;  body  length  1.16  mm.  (1.86  mm.  in 
 winged  forms  when  bodies  are  distended). 
 
 (92)  Cephalothrips  errans  new  species. 
 
 (34)  Genus  Cryptothrips  Uzel. 
 
 1.  Color  brown  to  blackish  brown,  Tvith  conspicuous  purplish  pigmentation;  seg- 
 
 ments 1  and  2  of  antennae  concolorous  with  head,  3  and  base  of  4 
 yellow,  others  shading  to  brown  toward  tip;  postocular  spines  not 
 long  and  prominent (93)  Cryptothrips  calif  or  nicus  Daniel. 
 
 2.  Color  uniformly  coal-black,  except  tarsi,  which  are  blackish  brown. 
 
 a.  Antennae  uniformly  black;  body  length  about  2.22  mm.;  two  pairs  of  promi- 
 nent postocular  spines (96)  Cryptothrips  carbonarius  Hood. 
 
 a\  General  color  of  antennae  black,  segment  2  paler  at  apex,  segment  3  with  two 
 transverse  brownish-yellow  bands,  one  at  base  and  the  other  in  the 
 middle;  body  length  about  2.7  mm.;  without  prominent  postocular 
 spines (97)  Cryptothrijjs  rectangularis  Hood. 
 
20  NORTH  AMEEICAN   THYSANOPTERA. 
 
 (37)  Phl<eothrips  HaJiday. 
 1.  Postocular  spines  long  and  conspicuous 
 a.  General  color  dark  brown,  with  tibi.  and  tarsi  bright  yellow;  cheeks  nearly 
 straight;  antenna,  one  and  three-fourths  times  as  lo;gtrhead'^ 
 
 .'.  General  color  yellowish  brown,  with  eonsiderab^e't^rref  h":S™:i 
 't'l.ra^rlr'aJ  r'*  '™^=  cheeks  slil^htlyarctdfa;" 
 
 arched;  antenna  one  and  one-half  times  as  long  as  head 
 
 2.  Postocular spin^wanting;  genera.colordarkmr:L?^::S'^^^^^^^^^^ 
 
 .hrte  pigment  markings  along  head,  thorax,  ank  abdomen,  and  on 
 
 .        (l^'S)  Phkeothrips  maculatm  Hood. 
 
 (38)  Genus  Liotheips  Uzel. 
 1.  Head  about  one  and  three-tenths  or  less  times  bs  long  as  wide 
 a.  P  ore  wmgs  bro^ish  at  extreme  ba.e;  head  about  one  and  fifteen  one-hundredth, 
 
 StrnlKorgth::?  "^'  ""SS'^^  -"r'-\'"' 
 
 a'.  Fore  wings  nearly  black  in  bLa,  half;-h;adab;roLtdXe:r,"hs^:  s 
 
 :L-irnL^i:S;rh7ar  -"'t^^-  -f.  ^^-^-^  -^« 
 
 a".  Fore  wings  brownish  in  basal  half     ^    ^      ""'"'"  «'"*"?'^«"«  Hood. 
 
 2.  Head  about  one  and  five-tenths  tii'l'Ltnta^Vre'""'"'"'^  '"'"^"""^  ^--f"''- 
 
 a.  Antenn.  lemon-yellow;  spines  on  prothorax  large  and  prominent;  mid  laterals 
 
 presen^t.  fully  as  long  as  anterior  marginals;  tube  two-t'hirds  ^  I^g 
 
 a^  Antennal  sogment;V-and-2-;;;V;.;;;ns-;;i;hn;'Sr^^^^^^ 
 
 prominent;  mid  laterals  wantin-  promorax  not 
 
 '  7"^  :i^=::l^:^±^^^  -- '» "^-  -n. 
 
 :^.rdX^ScrS£-p;;;-;i,^-^--^^^^^ 
 
 y.  Antenn.  one  and  two-thirds  ti^ Lr/itXtmTnril*?^:^ 
 brown,  concolorous  «ith  body,  others  yellow.  "  '  ^^  "  dark 
 
 .".  Antenme  one  and  one-fourth  times  a.  long  l^'^^J:lS:::^i:^^ti 
 2  cnoolorous  w,th  body,  apical  halt  of  2  and  ot  5  and  6  to  8  h.h 
 brown;  3,  4,  au.l  basal  half  ot  5  yellow;  tube  one-half  allo^".^' 
 
 (Ill)  Liothrips  mcconneUi  Crawford. 
 
 (39)  Genus  iDOLOTHKirs  Haliday. 
 
 .  Wings  wanting  or  reduced  to  pa.Is;  all  tibi»  and  tarsi  bright  yellow  tibi-e  often 
 
 (■louded  with  brown  at  base  moi  rS ;  ,!•    T'  "^^  "'"""" 
 
 .  Wings  fully  ,l,.vel,.po,l  but  .hort  ^      '  IMolhnps  Jlavipcs  Hood. 
 
 «.  Average  I,.„gth  5.28  mm  ;  color  deep  black;  entire  body  surface,  including 
 f.'.nnm  and  t.lmr,  finely  reticulated;  tarsi  yellow  ^ 
 
 "'•  '--'■  '--:•;; '  ^  '"•"■■■  <->"^  ^"^^^H'^^Tz^'::-^:^ 
 
 ^^^' (^1*^)  i(ioloLhnps  conifcraruni  rer<,rancle. 
 
CATALOGUE.  21 
 
 a" .  Average  length  about  3.3  mm.;  color  black,  antennal  segments  3  to  5  yellow 
 
 at  bases;  tarsi  blackish  brown (H-'^)  Idololhrips  armatus  Hood. 
 
 3.  Wings  large,  powerful,  brown  at  base;  median  vein  brown,  prominent,  and  extend- 
 ing to  middle  of  wing;  fore  wings  double  fringed  behind  for  about 
 40  hairs (116)  Idolothrips  tuberculatus  Hood. 
 
 (40)  Genus  Megalothrips  Ileeger. 
 
 1.  Color  dark  brown,  with  orange  or  red  pigment;  all  tibia)  and  tarsi  shaded  with 
 
 yellowish;  bases  of  antennal  segments  3-6  lemon-yellow. 
 
 (117)  Megalothrips  hesperus  Moulton. 
 
 2.  Color  nearly  uniformly  black,  excepting  tarsi,  which  are  blackish  brown. 
 
 (118)  Megalothrips  spinosus  Ilood. 
 
 CATALOGUE  OF  NORTH  AMERICAN  THYSANOPTERA. 
 1.     Genus  OROTHRIPS  Moulton,  1907. 
 
 (1)  Orothrips  keUoggii  Moulton,  Tech.  Ser.  12,  Pt.  Ill,  Bur.  Ent.,  U.  S.  Dept. 
 
 Agr.,  p.  45,  figs.,  1907. 
 
 Habitat:  Santa  Cruz  Mountains,  central  California. 
 
 Taken  in  blossoms  of  manzanita   {Manzanita  manzanita)    and   madrona 
 (Arbutus  menziesii)  in  March  and  April. 
 
 (2)  Orothrips  keUoggii  yosemitii  new  variety.     (For  description  see  p.  34.) 
 
 Habitat:  Yosemite  Valley,  Cal. 
 
 Taken  in  blossoms  of  wild  lilac  (Ceanothus  sp.?)  at  an  altitude  of  6,000 
 feet,  in  June  and  July. 
 
 2.     Genus  ERYTHROTHRIPS  new  genus. 
 
 (Described  on  page  34.) 
 
 (3)  Erjrthrothrips  arizonae  new  species.     (For  description  see  p.  35.) 
 
 Habitat:  Phoenix,  Ariz.;  Oroville,  Cal. 
 
 Taken  in  orange  and  olive  blossoms  in  Arizona,  by  Mr.  J.  Eliot  Coit, 
 and  on  Rharanus  purshiana  at  Oroville,  Cal.,  by  Mr.  B.  B.  Whitney. 
 
 3.     Genus  ANKOTHHIPS  Crawford. 
 
 (4)  Ankothrips  robustus  Crawford,  Pomona  College,  Journ.  Ent.,  vol.  1,  no.  4,  p. 
 
 100,  figs.,  1909. 
 
 Habitat:  Claremont  and  Los  Gatos,  Cal. 
 
 Taken  on  California  laurel  ( Umbellularia  californica)  and  California  lilac 
 {Ceanothus  sp.?)  at  an  altitude  of  5,000  feet. 
 
 4.     Genus  -ffiOLOTHRIPS  Haliday. 
 
 (5)  .ffiolothrips  bicolor  Hinds,  Mon.  Thys.  N.  Amer.,  Proc.  U.  S.  Nat.  Mus.,  vol. 
 
 26,  p.  130,  figs.,  1902. 
 
 Habitat:  Amherst,  Mass. 
 
 Food  plants:  Brunella  vulgaris,  Panicum  sanguinale,  bindweed,  and  various 
 grasses  in  mowings. 
 
 (6)  iEolothrips  vespiformis  Crawford,  Pomona  College,  Journ.  Ent.,  vol.  1,  no.  4, 
 
 p.  109,  figs.,  1909. 
 
 Habitat:  Managua,  Nicaragua. 
 Food  plant  not  known. 
 
^^  ^0«™    A.AIEEICAN    THYSANOPTEE^ 
 
 Ne.  Mexico;  San  J.e  and  cOa'rLv:m;.rr^^  '"™'-  '^"^'^'«^'>^ 
 
 fomia  in  blossom,  of  c'Jt^'nlJbncL     r'T  ^^^'  '''^  ^'"^'-     I"  ^^'i" 
 
 ««««»i  feuca«rt««„„,,  specimens  collected  bvfr    I   /^"u"''  ^'"''""'- 
 California  from  April  to  July  <=''"«<=''^'l  ''X  J-  C.  Bndwell.     Taken  in 
 
 (8)  ^olothrips  kuwanaii  iXoulton,  Tecli   Ser   1"   Pf    iit   p       ,, 
 
 Agr.,  p.  47,  figs.,  1907.  '  ^^^  "^'  ^"-  E«-.  U.  S.  Dept. 
 
 irabitat:  Santa  Cruz  Mountains,  California. 
 
 end  and  often  extends  aero",  the  I,  °'  t""^  ''  """'^"<^''  «  ««  ^"'erior 
 
 also  often  brown   "tead  of  len  on  v  1'  "T.-    '°"'°'  '  °^  "'^  ^■^'*^"-  - 
 
 Habitat:  Claremont,  Cal. 
 Food  plant:  Artemisia. 
 NoTE.-Described  from  one  male. 
 
 5.  Genus  PARTHENOTHRIPS  TJzel 
 
 Cal.  '  ^"^^^^^t,  Mass.;  San  Francisco  and  Sacramento 
 
 6.  Genus  BALIOTHRIPS  Haliday. 
 
 (il)  BaliothripsbasalisShull,  Ent.  New.,  vol.  20,  p.  224,  figs.,  May  1009 
 J/ahUat:  Huron  County,  Mich  ^' 
 
 On  leaves  of  millet  grass  (MiHwn  efysum)  in  August. 
 
 7.     Genus  THRIPS  Linnaus. 
 
 (!-'>  Thripamadi-oniiMoulton,  Tech   Scr   ]'>   Pf    Tir    p       t^ 
 Habitat:  California;  Ore^mn 
 
CATALOCIUE.  23 
 
 (13)  Thrips  magnus  now  specios.     (For  description  sec  p.  36,  PI.  IT,  fig.s.  10,  11.) 
 
 Uabitat:  Visalia,  Cal. 
 
 On  monkey-flower  (Mimulus  sp.?).  SpecimenH  collected  by  Mr.  P.  R. 
 Jones, 
 
 (14)  Thiips  tabaci  Lindeman,  1888.     Redescribed  by  Hinds,  Mon.  Thys.  N.  Amer., 
 
 Proc.  U.  S.  Nat.  ^fus.,  vol.  26,  p.  179,  figs.,  1902.     (The  onion  thrips.) 
 
 ndbitat:  After    Hinds — Russia;    England;    Italy;    Bohemia;    Heligoland; 
 Bermuda.     In  United  States,  generally  distributed  from  Maine  to  California. 
 Food  plants:  Almost  all  wild  and  cultivated  flowers,  grasses,  fruit  blos- 
 soms, and  truck  crops. 
 
 (15)  Thrips  abdominalis  Crawford,   Pomona  College,  Journ.  Ent.,  vol.  2,  no.  1, 
 
 page  157,  March,  1910. 
 Habitat:  Guadalajara,  Mexico. 
 Taken  in  various  Compositae,  Solanum,  Daucus  sp.?,  and  others. 
 
 (16)  Thrips  bremneiii  Moulton,  Tech.  Ser.  12,  Pt.  Ill,  Bur.  Ent.,  U.  S.  Dept.  Agr., 
 
 p.  59,  figs.,  1907. 
 Habitat:  San  Jose,  Cal. 
 From  inside  of  ripe  figs,  July. 
 
 (17)  Thrips  perplexus  Beach,  1895.     Redescribed  by  Hinds,  Mon.  Thys.  N.  Amer., 
 
 Proc.  U.  S.  Xat.  Mus.,  vol.  2G,  p.  184,  figs!,  1992. 
 Habitat:  Ames,  Iowa;  Amherst,  Mass. 
 Food  plants:  After  Hinds — Cyperus  sp.?,  corn,  various  grasses. 
 
 8.     Genus  HELIOTHRIPS  Hahday. 
 
 (18)  HeHothrips  femoralis  Renter,  1891.     Redescribed  by  Hinds,  Mon.  Thys.  N. 
 
 Amer.,  Proc.  U.  S.  Nat.  Mus.,  vol.  26,  p.  172,  figs.,  1902. 
 
 Habitat:  Helsingfors,  Finland.  United  States — District  of  Columbia; 
 Amherst,  Mass, 
 
 Food  plants:  As  listed  by  Hinds — Amarillis  sp.,  Aralia,  Arum,  Cestrum 
 noctumum,  Chrysanthemum,  Crinum,  cucumber,  Dracxna  sp.,  Eucharis 
 grandiflora,  Ficus  elastica,  F.  grandifiora,  Gardenia,  Gossypium,  Hydrangea, 
 Mina  lobata,  moonflower,  Pandanus,  Phoenix,  Richardia  sethiopica,  tomato, 
 Vitis. 
 
 (19)  HeHothrips  heemorrhoidahsBouche,  1833,    Redescribed  by  Hinds,  Mon.  Thys. 
 
 N.  Amer.,  Proc,  U,  S,  Nat,  Mus,,  vol,  26,  p,  168,  figs,,  1902.  Ref.:  Russell, 
 Bui.  64,  Pt,  VI,  Bur,  Ent.,  U,  S,  Dept,  Agr.;  Proc.  U.  S.  Nat.  Mus.,  vol.  33, 
 p,  719,  1908,     (The  greenhouse  thrips.) 
 
 Habitat:  England;  Germany;  Vienna;  Finland.  United  States — District 
 of  Columbia;  Iowa;  Massachusetts;  Michigan;  California.  Mexico;  St. 
 Vincent  and  Barbados  Islands;  Hongkong,  China. 
 
 Food  plants:  Aspidium,  azaleas,  croton,  dahlias,  Jems,  liliaceous  plants, 
 Pellea  hastata,  phlox,  pinks,  verbenas,  vines,  laurestinas. 
 
 Note. — This  insect  is  usually  a  hothouse  pest,  but  lives  out  of  doors  on 
 such  plants  as  laiu-estinas  and  azaleas  in  the  milder  California  climate. 
 Mr.  Franklin  records  it  from  the  Barbados  and  St,  Vincent  Islands,  in  the 
 West  Indies  group,  where  it  feeds  on  cacao,  kola,  and  date  palms;  and  numer- 
 ous shipments  of  mangoes  from  Mazatlan,  Mexico,  which  arrive  in  the  port 
 of  San  Francisco,  indicate  that  this  insect  is  a  serious  pest  on  these  fruits. 
 
 (20)  HeHothrips  fasciatus  Pergande,  1895,     Redescribed  by  Hinds,  Mon.  Thys. 
 
 N,  Amer.,  Proc.  U,  S,  Nat.  Mus.,  vol.  26,  p.  174,  1902. 
 
 Caliothrips  ivoodworthi,  Ent.  News,  vol.  15,  p.  297,  November,  1904. 
 Habitat:  Widespread  throughout  California. 
 
94 
 
 ^'°^TH   AIIEEICA.V    THYSANOPTERA. 
 
 r^^-^:^:'  '-  '  ''-'''''  ^-^  -  --^-,  alfalfa,  pear  trees,  and 
 
 (21)  Heliothripsfasciapeiinis  Hinds   Alon  Thv.   V    a 
 
 vol.  26,  p.  171,  figs.,  1902.        '  ^     ^^  '  -^^''•'  ^^°^-  "^'-  «•  Xat.  Mus., 
 
 Habitat:  Amherst,  Mass. 
 Food  plants:  Grasses. 
 
 9.     Genus  ECHINOTHKIPS  new  genus. 
 
 (Described  on  page  37.) 
 (22)  Echinothrips  mexicanus  new  species      (Var  a^      ■  .- 
 
 Habitat:  Acapulco,  Mexico  ^        description  see  p.  37.) 
 
 cStr  ^^'^^  ^^^"  ^  '"^^'^  ^-^^  P^-t  on  shipboard  in  San  Fran- 
 10.     Genus  DICTOTHRIPS  Uzel 
 
 Habitat:  Guadalajara,  Mexico 
 
 ''Taken  on  blossoms  of  native  acacia-like  tree"  (Crawford). 
 
 vol.  2,  no.  1, 
 
 Mon.   Thys. 
 
 11.     Genus  SERICOTHHIPS  Haliday,  1836. 
 (24)  Sericothrips  variabilis  Beach     ISQ^      t>    i 
 
 N.  Amer.,  Proc    U   S    Y^f   Ar        \  I^^descnbed  by  Hind. 
 
 new  A-ariely  of  this  species       ^      "'^'''  '^^^^^  probably  rank  as  a  distinct 
 (2a)  Sericothrips  pulcheUus  Hood,  Bui    111    St.to  T   ;     v       t. 
 
 p.  3G3,  1908.  '  ^-  ^^^^"^  ^^^-  ^^^-  Hist.,  vol.  8,  art.  2, 
 
 Habitat:  Muncie,  111 
 
 ^7r/X'-'n°T'  ^'''""'  '''■^''"'""^■ 
 
 variams  Beach,"but''tle  coIoraUon'if  r'f'  ''  ^'"  ''°^<'  '»  Sericothrips 
 examined  under  a  hand  ier^ZZdlnfl'T'-  '"  ''"""  ''"-"-- 
 without  luster,  due  no  doubt  t„tl,.  P"'<horax  are  velvety  black  and 
 
 (2C)  Sericothrips  ciniulatus  n!!  ,     x,        m.croscopio  reticulation." 
 
 nahuat:  Amherst,  Mass.;  Nebraska  City,  Nebr 
 
 in3ectir:/:.:Sr!rcity"tbr  r;  •■^rr^^'^^  ^•'-'—  -^  ••^'^ 
 
 These  are  broader  and  clea,     1.   Jhf.t  h      w    ''r'"  '""•^'  '''■■^•^'°P«'  ""««• 
 gray.br,nvn  in  ,l>e  outer  thre" -fourtl  '  '"""'  "'"'  ^'^"'■--  -"'  •'"""™' 
 
 P-  ■)»,  lf»07.  ^-'  ^  '■  "I'  I*"'--  J'-'it.,  IT.  S.  Dept.  A(;r., 
 
 //«i,to/.-  Counties  about  San  Francisco  n-,v  f  i-f      ■ 
 ^oo</pfon,..  Various  K,...,es  and   ^X      ''  ''"""""" 
 
 hrown.  ■'°"'"  ^^^"""°°-     S°™o  specimens  arc  almost  uniformly 
 
CATALOGUE.  25 
 
 (28)  Sericothrips  reticulatus  Moiilton,  Tech.  Scr.  12,  Pt.  IIT,  Bur.  Ent.,  U.  S. 
 
 Dcpt.  Agr.,  p.  50,  figs.,  J907. 
 TTahilat:  Santa  Clara  Valley,  Cal. 
 Food  plant:  Grass  and  weeds. 
 
 (29)  Sericothrips  stanfordii   Moiiltoii,  Tech.  Ser.  12,  Pt.  Ill,  Bur.  Ent.,  U.  S. 
 
 Dept.  Agr.,  p.  51,  figs.,  1907. 
 
 Habitat:  Stanford  University,  California. 
 Food  plants:  Grasses  and  various  weeds. 
 
 12.     Genus  RAPHIDOTHRIPS  TJzel. 
 
 (30)  Raphidotlirips  fuscipennis  Hinds,  Mon.  Thys.  N.  Amer.,  Proc,  U.  S.  Nat.  Mas., 
 
 vol.  2G.  p.  159,  figs.,  1902. 
 Habitat:  Massachusetts. 
 Food  plants:  Grasses. 
 
 13.     Genus  LIMOTHRIPS  HaHday, 
 
 (31)  Limothrips  cerealium    Haliday,  1852,   Redescribed    by  H^'nds,  ^Jon.  Thys. 
 
 N.  Amer.,  Proc.  U.  S.  Nat.  Mus.,  vol.  26,  p.  139,  figs.,  1902.  {Limothrips 
 avense  Hinds.) 
 
 Habitat:  England;  Germany.    United  States — Pennsylvania;  Massachusetts. 
 
 Food  plants:  Oats,  Festuca  pratensis. 
 
 14.     Genus  CHIROTHillPS  Haliday. 
 
 (32)  Chirothrips  manicatus  Haliday,  1836.     Redescribed  by  Hinds,  Mon.  Thys. 
 
 N.  Amer.,  Proc.  U.  S.  Nat.  Mus.,  vol.  26,  p.  134,  figs.,  1902. 
 
 Habitat:  England;  Germany;  Finland;  Russia;  Bohemia.  United  States — 
 Manchester,  Iowa;  Amherst,  Mass.;  Nebraska  City,  Nebr. ;  Corvallis,  Oreg. 
 
 Food  plants:  Flowers  of  various  grasses  and  cereals,  clover,  wild  carrots. 
 
 (33)  Chirothrips  mexicanus  Crawford,  Pomona  College,  Journ.  Ent.,  vol.  1.  no.  4, 
 
 p.  114,  figs.,  1909. 
 
 Habitat:  Guadalajara,  Mexico. 
 
 Food  plants:  Tobacco  flowers  {Nicotiana  tabacum). 
 
 (34)  Chirothrips  obesus  Hinds,  Mon.  Thys.  N.  Amer.,  Proc.  U.  S.  Nat.  Mus.,  vol. 
 
 26,  p.  137,  figs.,  1902. 
 Habitat:  Amherst,  Mass. 
 Food  plants:  Festuca  ovina,  Poa  pratensis. 
 
 (35)  Chirothrips  crassus  Hinds,  Mon.  Thys.  N.  Amer.,  Proc.  U.  S.  Nat.  Mus..  vol. 
 
 26,  p.  136,  figs.,  1902. 
 Habitat:  Amherst,  Mass. 
 Food  plants:  "Old  witch  grass,"  Panicum  capillare. 
 
 15.     Genus  APTINOTHRIPS  Kahday. 
 
 (36)  Aptinothrips  rufus  Gmelin,  1788,  and  variety  connatticornis  Uzel,  1895.     Rede- 
 
 scribed by  Hinds,  Mon.  Thys.  N.  Amer.,  Proc.  U.  S.  Nat.  Mus.,  vol.  26,  p.  166, 
 figs.,  1902. 
 
 Habitat:  England;  Russia;  Sweden;  Bohemia;  Germany;  Heligoland; 
 Finland.  United  States — Amherst,  Mass.;  Nebraska  City,  Nebr.;  San  Jose 
 and  Oakland,  Cal. 
 
 Food  plants:  Various  grasses  and  in  turf. 
 
9fi 
 
 -^'^^TH   A.AIERTCAX    THYSAXOPTEEA. 
 
 16.     Genus  SCOLOTHRIPS  Hinds. 
 (37j  Scolothrips  sexmaculatus  Per-andP      T?.^.       i    ^  .      .. 
 
 Taken  on  bean,  blackberry,  e.m,  and  hop  (Beach). 
 
 given  inHicd.,-..descripT    nandtnof  tT^    r  '"''  ^"'^^^  '"  «°>»  *-°  =« 
 to  band.,.  '^  "''  ""  ''^  *''«  '^■■"'^  «P«ts  on  the  wings  are  enlarged 
 
 17.     Genus  SCIE.TOTHBIPS  Shun. 
 (38)  Scirtotlirips  ruthveni  iShi.ll    p„f    ^• 
 
 /r.t,7a.  HuronTounty  mIh    ^'""'  ™'-  '"'  >^-  -"''  ^8-'  *I^y.  1909. 
 ^00.  ;.,„„,..  Tern^ina.  dusters  of  dogwood  iCornus  siojonifera). 
 18.  Genus  EUTHBIPS  Targioni-Tozzetti 
 (39)  =-^PS  orchid.  MouUon,  Tech.  Ser.  1,  Pt.  „I,  Bur.  Ent..  T.  S.  Bept.  A. 
 
 ^  Sfnn;^;r'^'„t'SSnTou^^^^^^^  ^«J--  <--")• 
 
 //«6,-L:  San  Frandsco,  Cal  ^  ""''"°"  ""^  ''^  ^^'  ^'-  ^V.  %..  23-25.) 
 
 ^411  P„f..^'""^ '?!'""'•■  ^'"'""^  hothouse  plants. 
 
 (41)  Euthnps  citn  Moulton,  Tech  Ser  1"    Pt  VT7   n       r-        , 
 
 ill«.,  1909.     (The  orange  thrip^')       '         ^"'  ^"^^  ^"'■'  "•  S.  Dept.  Agr., 
 
 //at.toC  Orange  districts   on   eastern   foothills   of    q»n    T         •      ,. 
 southern  California;  Phoenix,  Ariz.  '^"'"1"'"   ^""^y. 
 
 Taken  from  citrus  trees  and  thistle  f^l  in   S-,,,    T         ■       ,• 
 
 CaHfZu-Thtin^yiTintlrelrthT'  /"d""^  "^  '"^  ^^^^^  ^'^'-'^  "^ 
 
 //ati<«.:  Red  Bh^Y,  Cal.   ^  """"^  ""^  P'  ^^'  ^'^  "I'  ««-  20-22.) 
 
 /<q;  -c     ^  '^'''"'"  ""  peach-tree  foliage. 
 (13)  Euthripspyii  Daniel,  Ent.  News  vol  15  n  9Q.1  h 
 
 by  Jlouhon,  Tech.  Ser.  12  ft  m  1^;  ^p'^^T c ''^''  ''"'■  K^<'«^"il>ed 
 1907;  Bui.  08.  Pt.  I,  Bur  Ent  U  S  Den  1  «  ^'P''  ^^'•'  P'  "'''  ««»■• 
 Pt.  IV,  Bur.  Ent.,  U  ,S   Deot  A.r  Vf '       ,    '  ^^-  ^^■'  '"^-  "07;  Bui.  80, 
 
 IIulAUU:   Count  es  a  o,  nf ^.  °  .'    ^•'••' '""'  ^"'"'-     (T'^«  !'«"■  «>rips.) 
 .Sac.,„ento,  .ouTto X    1^  B  .^h^r  f  1^  "^T""'  '■•■.•ifonu-a.'north  to 
 
 iw  ,,„,...  Deciduous  f™us-":iii,i::;i  ?"'^*^'.^="«''"'^- 
 
 %,  grape,  peach,  pear,  plum  pnne  E.-H,  '    ',',','''''  ''''"™''  '■''«"■>'■ 
 
 in  England.  '  "^         '     "='"''  ""'""'■     J'lo^'on.s  of  wild  plum 
 
 (M)  Euthripaehrhormi  MouUon,  Toch    Ser    ]•>    P,    rrr    u        ,. 
 
 //otito/;  San  Jose  and  Saraloc-u   i\\ 
 
 Taken  o„  gra.ss  and  on  foliage  of  prune  Iree.,. 
 
CATALOGUE.  27 
 
 (45)  Euthrips  ulicia  califomicus  Moultoii,  Tech.  Ser.  12,  Pt.  Ill,  Bur.  Ent.,  U.  S. 
 
 Dept.  Agr.,  p.  55,  figa.,  1907. 
 
 Habitat:  Wrights  Station,  Santa  Cru/  Mountains,  Cal. 
 Taken  from  wild  vetch  sweepings. 
 
 (46)  Euthrips  minutus  Moulton,  Tech.  Ser.  12,  Pt.  Ill,  Bur.  Ent.,  U.  S.  Dept.  Agr., 
 
 p.  56,  figs.,  1907;  Pomona  College,  Journ.  Ent.,  vol.  1,  no.  4,  figs.,  1909. 
 Euthrips  minutus  setosus  Crawford. 
 Habitat:  Santa  Clara  Valley,  Yosemite  Valley  (altitude  5,000  ft.),  Suisun, 
 Newcastle,  Loomis,  Lindsay,  East  Highlands,  La  Honda,  Cal. 
 
 Food  plants:  Prune  and  cherry  foliage,  pear  and  cherry  blossoms,  grass, 
 yarrow,  chamisal,  buttercups,  sunflowers. 
 
 Note. — This  insect  is  also  found  to  be  usually  much  larger  than  in  the 
 original  description.     A  new  typical  specimen  has:  Head,  length  0.105  mm,, 
 width  0.135  mm.;  prothorax,  length  0.12  mm.,  width  0.18  mm.;  mesothorax, 
 width  0.240  mm.;  abdomen,  width  0.270  mm.,  and  total  body  length  1.30  mm. 
 Antennae:  1,  15//;   2,  33//;  3,  37//;  4,  39//;   5,  3C//;  6,  45/i;   7,    d/r,  8,  15/(; 
 total  0.23  mm. 
 The  back  of  the  head  is  cross-striate,  the  ocelli  have  orange-bro\^Ti  cres- 
 cents, and  the  fore  and  middle  tibiae  are  light  brown.     The  costa  has 
 twenty-six  to  twenty-eight  spines,  the  fore  vein  twenty  to  twenty-one 
 spines,  and  the  hind  vein  fifteen  to  sixteen  spines. 
 
 (47)  Euthrips  fuscus  Hinds,  Mon.  Thys.  N.  Amer.,  Proc.  U.  S.  Nat.  Mus.,  vol.  26, 
 
 p.  154,  figs.,  1902.  Euthrips  nicotianse  Hinds,  Proc.  Biol.  Soc.  Wash.,  vol.  18, 
 p.  197,  1905;  Cir.  68,  Bur.  Ent.,  U.  S.  Dept.  Agr.,  figs.,  1906;  Bui.  65,  Bur. 
 Ent.,  U.  S.  Dept.  Agr.,  figs.,  ills.,  1907.     (The  tobacco  thrips.) 
 
 Habitat:  Massachusetts;  Florida;  Georgia;  Texas. 
 
 Food  plants:  Grass  (?),  tobacco. 
 
 (48)  Eutlirips  insularis  Franklin,  Proc.  U.  S.  Nat.  Mus.,  vol.  33,  p.  715,  figs.,  1908. 
 
 Euthrips  insularis  reticulata  Crawford,  Pomona  College,  Journ.  Ent.,  vol.  1, 
 no.  4,  p.  116,  1909. 
 
 Habitat:  Guadalajara,  Mexico;  Barbadoes  and  W^est  Indies  Islands. 
 
 Food  plants:  Lupinus,  Convolvulus,  Compositae,  Rhamnu^  in  Mexico  at  an 
 elevation  of  from  1,000  to  2,500  ft.;  black  willow,  legumes,  yams,  beans,  roses, 
 grass,  potato,  papaw,  pepper,  tobacco,  white  wood,  woolly  pyrol.  Convolvulus, 
 ground  nut,  arrowroot,  flamboyant  in  the  Barbados  and  West  Indies  Islands. 
 
 (49)  Euthrips  nervosus  Uzel,  1895.     Redescribed  by  Hinds,  Mon.  Thys.  N.  Amer., 
 
 Proc.  U.  S.  Nat.  Mus.,  vol.  26,  p.  155,  figs.,  1902. 
 Habitat:  Bohemia;  Ames,  Iowa;  Amherst,  Mass. 
 Taken  on  corn,  various  grasses,  and  spring  flowers. 
 
 (50)  Eutlirips  cephalicus  Crawford,  Pomona  College,  Journ.  Ent.,  vol.  2,  no.  1,  p.  153, 
 
 March,  1910. 
 
 Habitat:  Guadalajara,  Mexico. 
 
 Food  plants:  ' '  Several  compositae,  a  small  native  acacia-like  tree,  aSolanum, 
 and  several  other  plants"  (Crawford). 
 
 (51)  Euthrips  cephalicus  reticulatus  Crawford,  Pomona  College,  Journ,  Ent.,  vol.  2, 
 
 no.  1,  p.  155,  March,  1910. 
 Habitat:  Guadalajara,  Mexico. 
 Taken  on  certain  Rosaceae  and  Labia tae. 
 
 (52)  Euthrips  helianthi  new  species.    (For  description  see  p.  40,  PL  IV,  figs.  26-29.) 
 
 Habitat:  Visalia,  Cal. 
 
 Taken  in  wild  sunflower  blossoms. 
 
 (53)  Euthrips  occidentalis  Pergande,  1895.     Redescribed  by  Hinds,  Mon.  Thys. 
 
 N.  Amer.,  Proc.  U.  S.  Nat.  Mus.,  vol.  26,  p.  152,  1902. 
 Habitat:  California. 
 Food  plants:  Blossoms  and  foliage  of  numerous  trees  and  vveeds. 
 
28  NORTH    AMERICAN    THYSAXOPTERA. 
 
 (54)  Euthrips  tritici  Fitch,  1855.     (For  description,  life-history  notes,  and  references, 
 
 see  Hinds,  Mon.  Thys.  N.  Amer.,  Proc.  U.  S.  Nat.  Mus.,  vol.  26,  p.  149,  1902.) 
 Habitat:  Generally  distributed  throughout  the  United  States. 
 Taken  in  flowers  of  almost  all  wild  and  cultivated  plants. 
 Note. — This  is  undoubtedly  the  commonest  and    the  most  widely  dis- 
 tributed of  all  American  species  of  thrips.     The  variation  within  the  species 
 ■wdll  probably  lead  some  later  writer  to  di\'ide  the  group  into  several  distinct 
 varieties.     The  insect  varies  fi'om  very  light  colored,  almost  white  individuals 
 (which  for  the  most  part  are  collected  in  white  or  light  colored  flowers)  to  very 
 dark  bro^vn,  and  from  individuals  with  no  shading  of  orange  to  those  colored 
 to  a  deep  red-orange.     The  writer  is  here  erecting  one  new  variety,  to  include 
 the  very  dark  brown  specimens  in  this  group.     These  can  not  possibly  be 
 included  within  the  species  as  Mr.  Hinds's  description  now  stands.     The 
 variety  is  called  Euthrips  tritici  calif ornicus. 
 
 (55)  Euthrips  tritici  califomicus  new  variety. 
 
 Habitat:  California,  Oregon,  and  Washington. 
 
 Taken  in  company  with  Euthrips  tritici,  in  the  blossoms  of  almost  all  wild 
 and  cultivated  plants.  The  variety  is  distinguished  from  the  species  by  the 
 following  characters:  General  color  uniformly  dark  brown,  thorax  orange- 
 brown;  segment  1  of  antennae  brown,  unicolorous  with  head,  segment  2  uni- 
 formly darker  brown. 
 
 19.  Genus  ANAPHOTHRIPS  Uzel. 
 
 (56)  Anaphothrips  striatus  Osborn,   1883.     Redescribed  by  Hinds,  Mon.  Thys. 
 
 X.  Amcr.,  Proc.  U.  S.  Xat.  Mus.,  vol.  26,  p.  160,  figs.,  1902.  Ref.:  Ent.  News, 
 vol.  20,  p.  224,  May,  1909  (males  found). 
 
 Habitat:  Illinois;  Iowa;  Maine;  Massachusetts.;  New  York;  Ohio;  Ontario; 
 Nebraska;  California. 
 
 Food  plants:  Poa  pratensis,  Phleum  pratense,  and  other  grasses;  in  Cali- 
 fornia on  leaves  and  ears  of  com,  and  on  alfalfa. 
 
 (57)  Anaphothrips  zeee  new  species.    (For  description  see  p.  41,  PI.  IV,  figs.  31-34.) 
 
 Habitat:  Yisalia,  San  Jose,  and  Red  Bluff,  Cal. 
 
 Taken  on  leaves  and  ears  of  corn,  on  grasses,  and  on  foliage  of  orange. 
 
 (58)  Anaphothrips  tricolor  now  species.     (For  description  see  p.  41.) 
 
 Habitat:  Tulare  County,  Cal. 
 
 Taken  on  goldenrod  and  on  orange  nursery  stock  by  Mr.  P.  R.  Jones. 
 
 20.  Genus  PSEUDOTHRIPS  Hinds. 
 
 (59)  Pseudo thrips  inequalis  Beach,  1896.     Redescribed  by  Hinds,  Mon.  Thys. 
 
 N.  Amer.,  Proc.  U.  S.  Nat.  Mus.,  vol.  26,  p.  146,  figs.,  1902. 
 Habitat:  Ames,  Iowa. 
 Food  plant:  Aster. 
 
 21.  Genus  HETEROTHIIIPS  Hood. 
 
 (60)  Heterothrips  salicis  Shull,  Ent.  News,  vol.  20,  p.  220,  figs..  May,  1909. 
 
 Habitat:  Huron  County,  Mich. 
 
 Taken  on  the  outside  of  catkins  of  a  willow  (Salixjluviatilis). 
 
 (61)  Heterothrips  arisaemee  Hood,  Bui.  III.  State  Lab.  Nat.  Hist.,  vol.  8,  art.  2, 
 
 p.  362,  August,  1900. 
 Habitat:  Urbana,  111. 
 Taken  in  flowers  of  jack-in-the-pulpit  (AriscCma  triphyllum). 
 
CATALOGUE.  29 
 
 (62)  Heterothrips  decacomis  ( 'rawford,  roinona  College,  Journ.  Ent.,  vol.  1,  no.  4, 
 
 p.  110,  1909. 
 
 Habitat:  Guadalajara,  Mexico. 
 
 Taken  on  a  low  native  tree  with  small  yellow  flowers,  common  in  the  bar- 
 rancas near  Guadalajara;  also  on  a  shrub  belonging  to  the  family  Alalpig- 
 hiacese. 
 
 22.     Genus  ALLOTHRIPS  Hood,  1908. 
 
 (63)  Allotlirips  megacephalus  Hood,  Bui.  111.  State  Lab.  Nat.  Hist.,  vol.  8,  art.  2, 
 
 p.  372,  figs.  1908.     Ref.:  Ent.  News,  vol.  20,  p.  228,  May,  1909  (males  found). 
 Habitat:  Urbana  and  Springfield,  111. 
 Taken  from  under  bark  of  various  trees  in  winter. 
 
 23.     Genus  RHAPTOTHRIPS  Crawford. 
 
 (64)  Rhaptothrips  peculiaris  Crawford,  Pomona  College,  Journ.  Ent.,  vol.  1,  no.  ^, 
 
 p.  116,  figs.,  1909. 
 
 Habitat:  Guadalajara,  Mexico. 
 
 Food  plant:  "A  certain  spiny  solanaceous  plant"  (Crawford). 
 
 24.     Genus  ANTHOTHIIIPS  Uzel. 
 
 (65)  Anthothrips  niger  Osborn.     Redescribed  by  Hinds,  Mon.  Thys.  N.  Amer., 
 
 Proc.  U.  S.  Nat.  Mus.,  vol.  26,  p.  188,  figs.,  1902. 
 
 Habitat:  Iowa;  Michigan;  Massachusetts;  Oregon;  California. 
 
 Food  plants:  Achillea  millefolium,  oxeye  daisy,  red  and  white  clover, 
 various  grasses. 
 
 (66)  Anthothrips  verbasci  Osborn.     Redescribed  by  Hinds,  Mon.  Thys.  N.  Amer., 
 
 Proc.  U.  S.  Nat.  Mus.,  vol.  26,  p.  189,  figs.,  1902. 
 Habitat:  Ames,  Iowa;  Amherst,  Masa. 
 Food  plant:  Mullein. 
 
 (67)  Anthothrips  variabihs  Crawford,  Pomona  College,  Journ.  Ent.,  vol.  2,  no.  1, 
 
 p.  166,  fig.,  March,  1910. 
 
 Habitat:  Santiago  de  las  Vegas,  Cuba;  Managua,  Nicaragua;  Guadalajara, 
 Mexico. 
 
 Food  plants:  ^'Celosa,  Dodder  and  native  creeping  vine"  (Crawford). 
 
 26.     Genus  ALETJRODOTHIIIPS  Frankhn. 
 
 (68)  Aleurodothrips  fasciapennis  Franklin  (described  as  Cryptothripsfasciapennis), 
 
 Proc.  U.  S.  Nat.  Mus.,  vol.  33,  p.  727,  figs.,  1908;  as  Aleurodothrips  fascia- 
 pennis in  Ent.  News,  vol.  20,  p.  228,  figs..  May,  1909. 
 
 Habitat:  Newstead,   St.   Peters,   Barbados   Islands;  Florida. 
 
 Taken  on  flower  of  La  France  rose  and  commonly  in  Florida  feeding  on  the 
 eggs,  larvae,  and  pupae  of  the  citms  white  fly  (Aleyrodes  citi  R.  &  H.). 
 
 26.     Genus  EXJRYTHRIPS  Hinds,  1902. 
 
 (69)  Eurythrips  ampHventrahs  Hinds,  Mon.  Thys.  N.  Amer.,  Proc.  U.  S.  Nat. 
 
 Mus.,  vol.  26,  p.  202,  figs.,  1902. 
 Habitat:  Amherst,  Mass. 
 ''Taken  in  turf  in  fall"  (Hinds). 
 
 (70)  Eurythrips  osbomi  Hinds,  Mon.  Thys.  N.  Amer.,  Proc.  U.  S.  Nat.  Mus.,  vol. 
 
 26,  p.  203,  figs.,  1902. 
 Habitat:  Amherst,  Mass. 
 Food  plants:  Grasses. 
 
30  NORTH    AMEEICAX    THYSAXOPTERA. 
 
 27.  Genus  LISSOTHRIPS  Hood,  1908. 
 
 (71)  Lissothrips  muscorum  Hood,  Bui.  111.  State  Lab.  Nat.  Hist.,  vol.  8,  art.  2 
 
 p.  265,  1908. 
 Habitat:  Illinois. 
 Taken  in  moss, 
 
 28.  Genus  TRICHOTHRIPS  Uzel,  1895. 
 
 (72)  Trichotlirips  dens  Moulton,  Tech.  Ser.  12,  Pt.  Ill,  Bur.  Ent.,  U.  S  Dept    \^t 
 
 p.  60,  figs.,  1907.  °    ' 
 
 Habitat:  Santa  Clara  Valley ,  Cal. 
 Taken  on  apricot  foliage. 
 
 (73)  Trichothrips  brevicuralis  Shull,  Ent.  News,  vol.  20,  p.  227,  figs..  May,  1909. 
 
 Habitat:  Huron  County,  Mich. 
 
 Taken  among  leaves  of  pine-cone  gall  on  willow  (Salixfluviatilisj. 
 
 (74)  Trichothrips  angusticeps  Hood,  Bui.  111.  State  Lab.  Nat.  Hist     vol   8   art   2 
 
 p.  367,  figs.,  1908.  '  '       •    ' 
 
 Habitat:  St.  Joseph  and  Urbana,  111. 
 Taken  under  bark  of  rotten  stumps. 
 
 (75)  Trichothrips  ruber  new  species.     (For  description  see  p.  42.) 
 
 Habitat:  San  Jose,  Cal. 
 Taken  in  azalea  blossoms. 
 
 (76)  Trichothrips  longritubus  Hood,  Bui.  111.  State  Lab.  Nat.  Hist    vol   8   art   2 
 
 p.  368,  1908.  '  »       •    ' 
 
 Habitat:  Carbondale,  111. 
 Taken  in  sweepings. 
 
 (77)  Trichothrips  buffae  Hood,  Bui.  111.  State  Lab.  Nat.  Hist.,  vol  8  art  2  p  369 
 
 figs.,  1908.  '  »  *-        ' 
 
 Habitat:  Decatur,  Homer,  and  Urbana,  111. 
 Taken  under  bark  of  soft-maple  trees. 
 
 (78)  Trichothrips  smithi  Hood,  Ent.  News,  vol.  20,  p.  29,  figs.,  January   1909 
 
 Habitat:  Boskydell,  111. 
 
 Taken  on  hard  maple  (Acer  saccharum). 
 
 (79)  Trichothrips  beachi  Hinds,  Mon.  Thys.  N.  Amer.,  Proc.  U.  S.  Nat  Mus     vol 
 
 20,  p.  192,  figs.,  1902. 
 Habitat:  Amherst,  Mass. 
 Taken  under  quince  bark. 
 
 (80)  Trichothrips  ambitus  Hinds,  Mon.  Thye.  N.  Amer.,  Proc.  U.  S    Nat    Mus 
 
 vol.  26,  p.  191,  figs.,  1902. 
 Habitat:  Amherst,  Mass. 
 Food  p  In  n  t:  G  rass . 
 
 (81)  Trichothrips  femoraUs  Moulton,  Tech.  Ser.  12,  Pt.  Ill,  Bur.  p:nt    U  S   Dept 
 
 Agr.,  p.  61,  figs.,  1907. 
 Habitat:  Newcastle,  Cal. 
 Food  ■plant:  Wild  mullein. 
 
 (82)  Trichothrips  americanus  Hood,  Bui.  111.  State  Lab.  Nat.  Hist.,  vol.  8,  art.  2 
 
 p.  366,  figs.,  1908. 
 
 Habitat:  Carbondale,  Homer,  and  Urbana,  111. 
 Taken  under  ])ark  on  rotten  stumps. 
 
 (83)  Trichothrips  ilex  Moulton,  Tech.  Ser.  12,  Pt.  Ill,  Bur.  Ent.,  U.  S.  Dept  Agr 
 
 p.  62,  figs.,  1907. 
 
 Habitat:  Coast  region  of  California. 
 
 Food  plant:  Christmas  berry  (Hctcromclcs  arbuti/olia). 
 
CATALOGUE.  31 
 
 (84)  Trichothrips  ilex  dumosa  Moiiltoii,  Tech.  Sor.  12,  Pt.  Ill,  Hur.  Ent  ,  U.  S. 
 
 Dopt.  Agr.,  p.  03,  1907. 
 Jlabitat:  Saratoga,  Cal. 
 Taken  on  prrub  oak  {Quercns  dumosa). 
 
 (85)  Trichothrips  tridentatus  Shull,  Ent.  News,  vol.  20,  p.  226,  figs..  May,  1909. 
 
 Jlabitat:  Huron  County,  Mich. 
 
 Taken  under  the  scales  of  the  bark  of  white  oak  (Qurrcus  alba). 
 
 29.     Genus  PLECTOTHRIPS  Hood,  1908. 
 
 (86)  Plectothrips  antennatus  Hood,  Bui.  HI.  State  Lab.  Nat.  Hist.,  vol.  8,  art.  2 
 
 p.  370,  1908. 
 
 Habitat:  Urbana,  111. 
 
 Taken  on  a  window  of  a  woodshed,  in  June. 
 
 (87)  Acanthothrips  magnafemorahs  Hinds,  Mon.  Thys.  N.  Amer.,  Proc.  U.  S. 
 
 Nat.  Mus.,  vol.  26,  p.  199,  figs.,  1902.     Pvef . :  Psyche,  vol.  10,  p.  221,  October- 
 December,  1903. 
 
 Habitat:  Miami,  Fla.;  Amherst,  Mass. 
 
 Food  plant:  Under  loose  bark  on  a  sycamore  tree. 
 
 (88)  Acanthothrips  nodicomis   Reuter,    Uzel's  Monograph,   p.    260,    figs.,    1895. 
 
 Ref.:  Psyche,  vol.  10,  p.  222,  October-December,  1903. 
 Habitat:  Germany;  Finland;  Bohemia;  Amherst,  Mass. 
 Taken  under  the  bark  of  a  sycamore  tree  in  Massachusetts. 
 
 (89)  Acanthothrips  doanei  Moulton,  Tech.  Ser.  12,  Pt.  Ill,  Bur.  Ent.,  U.  S.  Dept. 
 
 Agr.,  p.  64,  figs.,  1907. 
 
 Habitat:  Alum  Rock  Canyon,  San  Jose,  Cal. 
 Food  plant:  Grass. 
 
 (90)  Acanthothrips  albivittatus  Hood,  Bui.  111.  State  Lab.  Nat.  Hist.,  vol.  8,  art. 
 
 2,  p.  374,  1908. 
 
 Habitat'  Bloomington,  111. 
 
 Taken  on  the  trunk  of  a  Carolina  poplar. 
 
 31.  Genus  CEPHALOTHRIPS  Uzel,  1895. 
 
 (91)  Cephalothrips  ynccae  Hinds,  Mon.  Thys.  N.  Amer.,  Proc.  U.  S.  Nat.  Mus., 
 
 vol.  26,  p.  194,  figs.,  1902. 
 
 Habitat:  Amherst,  Mass.;  Washington,  D.  C. 
 Food  plants:    Yucca  flamentosa,  goldenrod. 
 
 (92)  Cephalothrips  errans  new  species.     (For  description  see  p.  43,  PI.  VI,  figs. 
 
 42-44.) 
 
 Habitat:  San  Jose,  Cal. 
 
 Food  plants:  Wild  mustard,  apricot,  and  pine  foliage.     Taken  during  June 
 and  July. 
 
 32.  Genus  MALACOTHRIPS  Hinds,  1902. 
 
 (&3)  Malacothrips  zonatus  Hinds,  Mon.  Thys.  N.  Amer.,  Proc.  U.  S.  Nat.  Mus., 
 vol.  26,  p.  200,  figs.,  1902. 
 Habitat:  Amherst,  Mass. 
 Taken  in  turf. 
 
^2  ^^'ORTH   .IJVIEEICA^-    THYSAXOFTEEA. 
 
 33.     Genus  NEOTHRIPS  Hood,  1908. 
 
 (94)  Neothrips  corticis  Hood,  Bui   111   State  T>^h   Y^t   tt-  ,         i    o 
 
 figs.,  190S.  ^^^*-  ■^^^^^•'  ^'ol-  8'  art.  2,  p.  372, 
 
 Habitat:  Urbana  and  Hillery,  111. 
 Taken  under  bark  in  winter. ' 
 
 34.     Genus  CRYPTOTHRIPS^  Uzel,  1895. 
 
 (95)  Crypto thrips  calif omicus  Daniel    V-nt    v^  i   -.- 
 
 RedescHbed  by  Mou.tooS'sl'z^^r'm  B^^Enf 'rTS'T  T 
 p.  66,  figs.,  1907.  '  ^^•'  ^  •  ^-  ^^P*^-  ^gr-> 
 
 habitat:  California,  Oregon,  and  Washington 
 
 (96)  Cryptothxips  carbonarius  Hood  B'll   I?l    St,t„  t    u    ^-       „. 
 
 p.  37C,  fig.,.,  1008.  ^'""'  ^''''-  '^'"-  °'^t-'  ^-ol-  S,  art.  2, 
 
 Habitat:  Pulaski,  111. 
 ^07^  ,.       Jiu""  '°  ^^'■«'°PinS3  from  grass  and  weeds. 
 
 (97)  CryptothnpsrectangularisHood,  Can  Ent    vol   40  „     o        o„,   . 
 
 i7«6,-taf  Urbana,  111.,  and  Harrisbur.  Pa'  '         ''  "■  '"''  ''"^-  ^»°«- 
 
 Taken  under  dead  bark  in  peach  fre°e  in  Illinni,  o„^  '<t    u 
 dopterous  or  coleopterous  larva  in  d^ad "illow  "      "  '""™"  "^  '^P'' 
 
 35.  Genus  LEPTOTHEIPS  Hood,  1909. 
 
 (98)  Leptothrips  asperus  Hinds,  Ent.  News,  vol.  20,  p.  249,  June    1909 
 
 voX  i;.r "^or  ^'  '''-  ''''■  ^-  ^^--  ^-  '^  S^Nat.  MU3.. 
 
 Taken  on  grape. 
 
 36.  Genus  ZYGOTHRIPS  Uzel,  1895. 
 
 (99)  Zygothrips  longicepa  Uood,  Bui.  111.  State  Lab    \.t    TIJ  f         i    o 
 
 P-  364,  figs.,  1908.  ^-  -^^'''^•'  ^'«^-  ^'  art.  2, 
 
 Habitat:  Carbondale,  III. 
 Taken  in  a  gall  on  Solidago. 
 
 37.     Genus  PHLCEOTHRIPS  HaHday,  1836. 
 
 (100)  PMcBothrips  uzeU  Hinds,  Mon.  Thys.  X    Amer     Proc    TJ   ^    N  .    Ar 
 
 26,  p.  19G,  figs.,  1902.  '  '        ""  ^-  ^-  ^^^'  ^^'^''■>  vol. 
 
 Habitat:  Amherst,  Mass 
 
 Habitat:  Amherst,  Mass. 
 Taken  on  grass. 
 
 For  Cryptothrips  asperus  HindH,  see  Leptothrips  asperus,  No.  98. 
 
CATALOGUE.  66 
 
 (102)  Phloeothrips  raptor  Crawford,   Pomona  College,  Journ.  Ent.,  vol.  2,  no.   1, 
 
 p.  159,  March,  1910. 
 
 Habitat:  Guadalajara,  Mex. 
 Taken  in  Bweepin<^  Hhriibbery. 
 
 (103)  Phloeothrips  maculatus  Hood,  Ent.  News,  vol.  20,  p.  250,  figs.,  June,  1909. 
 
 Habitat:  Baldwin,  Mich. 
 
 Taken  under  rotting  poplar  bark. 
 
 38.     Genus  LIOTHRIPS  XJzel,  1895. 
 
 (104)  Liothrips  ocellatus  Hood,  Bui.  111.  State  Lab.  Nat.  Hist.,  vol.  8,  art.  2,  p.  375, 
 
 1908.     Ref.:  Ent.  News,  vol.  20,  p.  249,  June,  1909. 
 Habitat:  Hilleiy,  111. 
 Taken  in  moss. 
 
 (105)  Liothrips  umbripeimis  Hood,  Ent.  News,  vol.  20,  p.  30,  figs.,  January,  1909. 
 
 (Described  as  Phyllothrips  umbripennis.) 
 Habitat:  Illinois  and  Michigan. 
 Taken  on  various  species  of  oak. 
 
 (106)  Liothrips  umbripennis  mexicanus  Crawford,  Pomona  College,  Journ.  Ent., 
 
 vol.  2,  no.  1,  p.  161,  March,  1910. 
 Habitat:  Guadalajara,  Mex. 
 Talven  in  oak  galls,  at  an  elevation  of  10,000  feet. 
 
 (107)  Liothrips  citricomis  Hood,  Can.  Ent.,  vol.  40,  no.  9,   p.  305,  fig.,   1908. 
 
 (Described  as  Phyllothrips  citricomis.) 
 
 Habitat:  Dubois,  Duquoin,  Odin,  and  Pulaski,  111.;  Harrisburg  and  Rock- 
 ville.  Pa. 
 
 Food  plants:  "On  hickory  leaves,"  in  Illinois  and  "on  wild  grape"  in 
 Pennsylvania,  April  28  to  July  16. 
 
 (108)  Liothrips  fasciculatus  Crawford,  Pomona  College,  Journ.  Ent.,  vol.  1,  no.  4? 
 
 p.  105,  figs.,  1909.     (Described  as  Phyllothrips  fasciculata.) 
 Habitat:  Claremont  and  Suisun,   Cai. 
 Food  2')lant:  Wild  buckwheat  {Eriogonum  fasciculatum), 
 
 (109)  Liothrips  fasciculatus  stenoceps  Crawford,  Pomona  College,  Journ.  Ent., 
 
 vol.  1,  no.  4,  p.  108,  1909. 
 Habitat:  Claremont,  Cal. 
 Specimens  taken  with  Liothrips  fasciculatus  on  wild  buckwheat. 
 
 (110)  Liothrips  bakeri  Crawford,  Pomona  College,  Journ.  Ent.,  vol.  2,  no.  1,  p.  161, 
 
 March,  1910. 
 
 Habitat:  Havana,  Cuba. 
 
 Taken  on  "galls  on  leaves  of  Ficus  nitida  and  flowers  of  Ficus  religiosa'^ 
 (Crawford). 
 
 (111)  Liothrips  mcconnelli  Crawford,  Pomona  College,  Journ.  Ent.,  vol.  2,  no.  1, 
 
 p.  163,  March,  1910. 
 
 Habitat:  Guadalajara,  Mex.;  Chico  and  Suisun,  Cal. 
 
 Taken  from  "stems  and  leaves  of  a  certain  bignoniaceous  shrub,  and  also 
 from  sweepings  on  other  shrubs"  (Crawford);  prune  foliage  and  apple  blos- 
 soms in  California. 
 
 39.     Genus  IDOLOTHRIPS  EaHday,  1862. 
 
 (112)  Idolothrips  flavipes  Hood,  Bui.  111.  State  Lab.  Nat.  Hist.,  vol.  8,  art.  2,  p.  377, 
 
 fig.,  1908. 
 Habitat:  Illinois. 
 Specimens  taken  among  fallen  oak  leaves. 
 
 71924°— 11 3 
 
34  XOETH   AMEBIC  AX    THYSAXOPTERA. 
 
 (113)  Idolothrips  angiisticeps  Crawford,  Pomona  College,  Journ.  Ent.,  vol.  2,  no.  1, 
 
 p.  IGS,  figs.,  March,  1910. 
 
 Habitat:  "Belize;  Havana,  Cuba;  San  Marcos  and  Chivandega,  Nicaragua; 
 Guadalajara,  Mex."  (Crawford). 
 
 (114)  Idolothrips    coniferanun    Pergande,   1896.     Redescribed  by  Hinds,   Mon. 
 
 Thys.  X.  Amer.,  Proc.  U.  S.  Nat.  Mus.,  vol.  26,  p.  206,  figs.,  1902. 
 Habitat:  Washington,  D.  C;  Amherst,  Mass. 
 Taken  on  Pinus  inops,  Juniperus  virginiana,  and  Abies  sp. 
 
 (115)  Idolothrips  armatus  Hood,  Ann.  Ent.  Soc.  Amer.,  vol.  1,  no.  4,  p.  285,  figs., 
 
 December,  1908. 
 Habitat:  Carbondale,  Havana,  Pulaski,  and  Urbana,  111, 
 Taken  in  galls  of  Gnorimoschema  gall^solidaginis  on  Solidago  canadensis  in 
 
 miscellaneous  and  woodland  sweepings;  on  Plantago  riigeJii. 
 
 (116)  Idolothrips  tuberculatus  Hood,  Ann.  Ent.  Soc.  Amer.,  vol.  1,  no.  4,  p.  287, 
 
 figs.,  December,  1908. 
 Habitat:  White  Heath  and  Boskydell,  111. 
 Taken  on  white  oak. 
 
 40.     Genus  MEGALOTHRIPS  Heeger. 
 
 (117)  Megalothrips  hesperus  Moulton,  Tech.  Ser.  12,  Pt.  Ill,  Bur.  Ent.,  U.  S. 
 
 Dept.  Agr.,  p.  65,  figs.,  1907. 
 Habitat:  Stanford  University,  California. 
 Food  plant:  Not  known. 
 
 (118)  Megalothrips  (?)  spinosus  Hood,  Can.  Ent.,  vol.  40,  p.  306,  figs.,  1908.     Ref.: 
 
 Ent.  News,  vol.  20,  p.  231,  May,  1909. 
 
 Habitat:  Harrisburg,  Pa.;  St.  Anthony  Park  and  St.  Paul,  Minn. 
 
 Taken  "in  burrows  of  lepidopterous  or  coleopterous  larvae  in  dead  willow 
 stem,"  and  "under  the  bark  of  dead  limb  of  white  birch." 
 
 DESCRIPTIONS    OF    NEW    GENERA    AND    NEW    SPECIES. 
 
 [The  numbers  correspond  to  the  list  numbers  in  the  catalogue.] 
 
 (2)   Orothrips  kelloggii  yosemitii  new  variety.     (PL  II,  fig.  9.) 
 
 Measurements:  Head,  length  0.16  mm.,  width  0.20  mm. ;  prothorax, 
 length  0.16  mm.,  width  0.25  mm.;  mesothorax,  ^^ddth  0.35  mm.; 
 abdomen,  width  0.45  mm.;  total  body,  length  1.75  mm.  Antennae : 
 1,30/z;  2,54/x;  3,99/z;  4,96//;  5,63//;  6,48//;  7,45//;  8,33//;  9,33//; 
 total,  0.50  mm. 
 
 Color  dark  brown  to  blackish-brown;  cheeks  not  strongly  arched. 
 Segment  2  of  antennae  yellow,  dark  brown  at  base;  segment  3  yellow, 
 but  dark  brown  in  outer  half;  segment  3  noticeably  constricted  in 
 the  middle;  sense  areas  on  segments  3  and  4  ovoid  (in  0.  Tcelloggii 
 elongate).  Spines  on  hind  margin  of  ])rothorax  short  but  quite 
 stout;  those  on  mesonotum  likewise  small.  Trochanters  not  notice- 
 ably yellow.  Darkened  bands  in  center  and  at  tip  of  wings  smaller 
 and  lighter  colored  and  more  irregular  than  in  Orothrips  Tcelloggii, 
 
 2.     Genus  ERYTHROTHRIPS  new  genus. 
 
 Head  almost  one-tliird  longer  than  wide.  Ocelli  present  in  both 
 sexes.  Antenna?  nine-segmented,  the  last  two  segments  closely 
 joined  and  together  somewhat  shorter  than  segment  7.     Maxillary 
 
DESCRIPTIONS   OF   NEW   GENERA  AND   SPECIES.  35 
 
 palpi  geniculatod  and  with  ciglit  sc<^ni('iitH.  Labial  ])alpi  with  three 
 segments.  Prothorax  about  as  long  as  head  and  only  a  little  wider, 
 without  large  bristles.  Legs  long  and  slender;  fore  femora  somewhat 
 thickened  in  both  sexes.  Wings  present  in  both  sexes;  fore  wings 
 very  slightly  narrowed  before  the  middle;  fore  part  of  ring  vein  and 
 fore  longitudinal  vein  furnished  with  a  few  sparse,  inconspicuous 
 hairs;  fore  wings  white,  with  dark-brown  longitudinal  band  along 
 posterior  margin. 
 (3)  Erytlirotlirips  arizonse  new  species.     (PL  I,  figs.  1-7.) 
 
 Measurements:  Head,  length  0.24  mm.,  wddth  0.19  mm.;  protho- 
 rax, length  0.24  mm.,  width  0.23  mm.;  mesothorax,  ^ddth  0.38  mm.; 
 abdomen,  width  0.49  mm.;  total  body,  length  2.66  mm.  Antennse: 
 1,  45,«;  2,  63/z;3,  126,«;4,  IU/j.;  5,  6,  72 /z;  7,  69//;  8,  SO/x;  9,  18/i; 
 total  length,  0.64  mm. 
 
 Color  dark  brown,  with  red  pigmentation;  connecting  tissue  of 
 abdominal  segments  light  brown  to  brown. 
 
 Head  about  one-fourth  longer  than  wide,  rounded  in  front  and 
 elevated  only  a  little  between  basal  segments  of  antennse;  cheeks 
 sHghtly  arched,  converging  but  very  shghtly  posteriorly;  back  of 
 head  cross-striated;  without  prominent  spines.  £7/^5  prominent,  not 
 protruding,  black;  eyes  v>dth  large  facets,  pilose.  Ocelli  present. 
 Mouth-cone  short,  pointed;  maxillary  palpi  geniculate,  eight-seg- 
 mented; labial  palpi  four-segmented;  basal  segment  small.  Antennae 
 nine-segmented,  two  and  one-half  tim.es  as  long  as  head;  brovvTi,  uni- 
 colorous  with  body  except  basal  part  of  segment  3,  which  is  light 
 brown.  All  segments  thickly  clothed  ^dth  short  spines.  A  long 
 slender  sense  area  on  each  of  segments  3  and  4. 
 
 Protliorax  about  as  wdde  as  long  and  only  a  little  larger  than  the 
 head;  with  several  inconspicuous  spines;  all  angles  broadly  rounded. 
 Legs  uniformly  dark  brown  in  females,  but  fore  tibise  and  tarsi 
 shading  to  light  brown  in  males.  Fore  femora  slightly  enlarged; 
 tibise  each  with  a  stout  spine  at  tip;  all  legs  thickly  set  \yith.  short, 
 dark  spines.  Fore  wings  of  about  even  width  for  entire  length,  very 
 sHghtly  narrowed  before  the  middle,  broadly  rounded  at  tip;  with 
 ring  vein  and  two  longitudinal  veins  that  unite  with  ring  vein  near 
 tip;  with  five  cross  veins;  fore  part  of  ring  vein  and  fore  longitudinal 
 vein  with  small,  white, inconspicuous  spines;  second  longitudinal  vein 
 with  about  twenty-seven  dark  spines.  Posterior  margin  of  ^ing  only 
 with  fringe.  Wings  clear  white,  with  dark-brown  longitudinal  band 
 extending  from  base,  including  scale,  to  tip,  this  band  broadest  at 
 middle  of  wing  and  somewhat  narrowed  before  the  middle.  Hind 
 wings  clear  white,  margined  with  fringe  only  along  posterior  side. 
 
 Abdovfien  large,  fourth  and  fifth  segments  widest  and  from  them 
 tapering  gradually  to  the  bluntly  pointed  tenth  segment.     Without 
 
36  NOETH   AMEKICAls^    THYSANOPTEEA. 
 
 long  spines  except  on  last  tliree  segments.     Eighth  abdominal  seg- 
 ment of  males  covered  with  many  long  hairs. 
 Described  from  four  females  and  ten  males. 
 
 Halitat:  PhoenLx,  Ariz.,  tj-pe  specimens  collected  and  forwarded 
 by  Mr.  J.  Eliot  Coit;  California,  specimens  collected  by  Mr.  B.  B. 
 Whitney  at  Oroville. 
 
 Food  plants:  Orange  and  olive  blossoms  in  Arizona;  Bhamnus 
 pursliiana  in  California. 
 
 The  larva  of  tliis  species  is  uniformly  light  brownish-yellow  and 
 has  conspicuous  red  pigment  bands  across  the  dorsal  plates  of  meso- 
 thoracic  and  metathoracic  segments  and  all  segments  of  abdomen. 
 (13)   Thrips  magnus  new  species.     (PI.  II,  figs.  10,  11.) 
 
 Measurements:  Head,  length  0.13  mm.,  \vidth  0.18  mm.;  protho- 
 rax,  length  0.16  mm.,  width  0.23  mm.;  mesotliorax,  width  0.35  mm.; 
 abdomen,  ^\ddth  0.40  mm.;  total  body,  length  1.70  mm.  Antennae: 
 1,  24  ^u;  2,  36  /i;  3,  56  p.;  4,  51  /t;  5,  42  ji;  6,  54  /i;  7,  24  /.r,  total  length 
 0.30  mm. 
 
 General  color  very  dark  brown,  head  blackish  brown. 
 Head  considerably  wider  than  long,  broadest  near  back;  cheeks 
 very  slightly  arched,  roughened ;  front  of  head  broadly  rounded ;  back 
 of  head  transversely  striate.  A  small  spine  on  front  of  each  posterior 
 ocellus  and  a  row  of  several  smaller  spines  back  of  each  eye.  Eyes 
 large,  occupying  about  two-thirds  the  width  of  the  head,  not  unusually 
 protruding,  pilose.  Ocelli  subapproximate,  with  dark-brown  cres- 
 cents. Moutli-cone  short,  reacliing  hardly  past  middle  of  prothorax, 
 pointed;  maxillary  palpi  three-segmented;  labial  palpi  two-seg- 
 mented. Antennse  seven-segmented,  sHghtly  more  than  tmce  as  long 
 as  head,  uniform  dark  brown,  with  segments  1  and  2  often  blackish- 
 brown;  forked  sense  cones  on  dorsal  side  of  segment  3  and  ventral 
 side  of  segment  4. 
 
 Prothorax  somewhat  larger  than  head,  all  angles  rounded;  two  long 
 prominent  spines  on  each  posterior  angle,  several  smaller  ones  along 
 posterior  margin,  the  inner  one  being  the  longest ;  other  spines  present 
 but  not  conspicuous.  Mesotliorax  largest,  sides  of  ptertlwrax  broadly 
 and  evenly  rounded.  Legs  dark  brown,  tips  of  tibire  and  tarsi  shad- 
 ing to  lighter  or  yellowish  brown;  liind  tibiiX)  alone  armed  with 
 spines.  Wings  present;  fore  wing  large,  uniform  brown,  with  spines 
 arranged  as  follows:  Costa,  tliirty-one;  fore  longitudinal  vein  with 
 eight  at  base  and  three  scattered  on  outer  half;  liind  vein  with 
 thirteen. 
 
 Ahdomen  subovate,  tliird  and  fourth  segments  largest;  longest 
 spines  on  last  two  segments. 
 
 Described  from  numerous  females.     Alales  much  larger. 
 Habitat:  Visaha,  (  oyote,  and  San  Francisco,  Cal. 
 Food  'plant:  Mlrnulus  sp. 
 
DESCRIPTIONS   OF   NEW   GENERA   AND   SPECIES.  37 
 
 9.     Genus  ECHINOTHRIPS  new  genus. 
 
 Head  and  tliorax  with  a  (leoi)ly  reticulated  structure  (sides  of  abdo- 
 men may  also  be  reticulated).  Head  about  as  lon<^  as  wide  and  not 
 longer  than  the  prothorax.  Eyes  large,  oval,  prominent.  Ocelli 
 present.  Antennae  with  eight  segments,  long,  slender,  last  four  seg- 
 ments united  evenly  and  diminisliing  in  size  gradually.  Prothorax 
 angular  at  sides.  Legs  slender,  unarmed.  Wings  present,  strong, 
 broadest  at  base  and  tapering  gradually  to  a  pointed  tip,  without 
 prominent  veins  except  fore  part  of  ring  vein.  Spines  on  fore  margin 
 and  where  fore  longitudinal  vein  should  be,  long,  strong,  and  with 
 blunt  tips. 
 
 This  genus  has  many  of  the  characters  of  both  Ileliotlirips  and  Dic- 
 totlirips.  It  is  readily  determined  from  the  former  by  the  shape  of 
 the  antennae,  inasmuch  as  the  segments  are  all  rather  slender  and  c^uite 
 evenly  united;  segment  6  is  longest;  the  style  not  longer  than. seg- 
 ment 6.  It  is  readily  separated  from  Dicfothrips  by  the  character  of 
 the  wings,  wliich  have  two  rows  of  long,  strong,  blunt  spines  along  the 
 anterior  margin. 
 (22)  Echinothrips  mexicanus  new  species.     (PI.  Ill,  ngs.  16-19.) 
 
 Measurements:  Head,  length  0.10  mm.,  wddth  0.15  mm.;  protho- 
 rax, length  0.10  mm.,  width  0.18  mm.;  mesothorax,  width  0.23  mm.; 
 abdomen,  width  0.23  mm.;  total  body,  length  0.92  mm.  Antennae: 
 1,  9  n;  2,  30  //;  3,  45  [i]  4,  39  ii;  5,  45  //;  6,  60  /x;  7,  15  [i;  8,  27  //; 
 total,  0.27  mm. 
 
 General  color  uniform  dark  brown,  with  red  pigmentation.  Bases 
 of  femora,  tips  of  tibiae,  all  tarsi,  outer  half  of  segments  3  and  4,  and 
 base  of  segment  5  of  antennae  yellow. 
 
 Head  noticeably  wider  than  long,  retracted  into  the  prothorax, 
 angular  in  front,  with  basal  joints  of  antennae  subapproximate;  ver- 
 tex depressed  and  bearing  the  anterior  ocellus  on  its  anterior  surface; 
 strongly  reticulate;  cheeks  roughened  and  with  spines.  Eyes  large, 
 oval,  prominent,  shghtly  protruding,  reddish  black  with  yellomsh 
 inner  and  outer  margins;  facets  large,  protruding,  strongly  pilose. 
 Ocelli  present,  subapproximate,  placed  near  center  of  head,  anterior 
 ocellus  directed  forward,  posterior  ones  distinctly  separated  from 
 inner  margins  of  eyes;  yeUow-orange,  with  deep  orange-red  crescents. 
 Mouth-cone  pointed,  reaching  past  base  of  prosternum.  Antennx 
 with  eight  segments,  two  and  one-half  times  as  long  as  head,  slender; 
 segment  6  longest;  segments  1  and  2  deep  brown,  unicolorous  with 
 head,  terminal  segments  brown,  intermediate  segments  yellow. 
 (Segments  5  to  8  united  evenly,  antennae  tapering  gradually  from 
 base  of  segment  6  to  tip.) 
 
 Prothorax  about  as  long  as  head,  widest  at  middle;  sides  angular, 
 roughened  and  with  curved  spines;  strongly  reticulate.     Mesothorax 
 
38  NORTH   AMERICAN    THYSAXOPTERA. 
 
 largest,  with  notch  on  either  side  near  posterior  margin,  uniting 
 evenh'  with  metathorax.  Legs  slender,  with  numerous  hairs  but 
 without  claws.  Fore  icings  strong,  broadest  at  base,  tapering  grad- 
 ually from  base  to  pomt  at  tip;  anterior  part  of  ring-vein  prominent, 
 posterior  part  and  other  longitudinal  reins  wanting.  With  a  row  of 
 tliirteen  long,  brown,  blunt  spmes  along  anterior  margin,  and  ten  other 
 similar  spines  close  to  anterior  margin  where  fore  longitudinal  vein 
 should  be;  fore  fringe  long  and  wavy,  especially  on  outer  half  of 
 wing;  posterior  fringe  also  well  developed.  Things  uniform  dark 
 bro^Ti,  with  elongate  whitened  area  near  base.  Posterior  pair  of 
 wings  each  with  single,  median,  dark  brown,  longitudinal  vein  extend- 
 ing from  base  to  near  tip;  wmg  membrane  bro^vn,  fringe  well  devel- 
 oped. 
 
 Abdomen  widest  across  tlurd  and  fourth  segments  and  from  them 
 tapering  gradually  to  a  blunt  tip;  with  numerous  spines  along  sides 
 and  on  dorsum;  a  single  pair  near  anterior  margin  on  each  segment 
 most  conspicuous. 
 
 Described  from  a  single  female. 
 
 Habitat:  Acapulco,  Mexico. 
 
 Specimens  taken  from  a  small  potted  plant  on  shipboard  in  San 
 Francisco  from  Acapulco,  Mexico.  One  adult  with  numerous  larv» 
 and  pupae. 
 
 (40)  Euthrips  parvus  new  species.     (PL  IV,  figs.  23-25.) 
 
 Measurements:  Head,  length  0.09  mm.,  width  0.126  mm.;  pro- 
 tliorax,  length  0.096  mm.,  width  0.144  mm.;  mesothorax,  width  0.16 
 mm.;  abdomen,  width  0.21  mm.;  total  bodv,  length  0.95  mm 
 
 Antennae:  1,15/.;  2,  30 /^-  3,  45 /.;  4,  39 /.;  5,  36  ;.;  6,45«;7,9«; 
 8,  12/.;  total  length  0.225  mm. 
 
 General  color  orange-yellow;  forewings,  as  also  segments  3  to  8  of 
 antennae,  light  brown. 
 
 Head  angular  in  front,  with  depression  to  receive  basal  segments 
 of  antenna);  frons  depressed,  broadest  across  eyes;  sides  of  licad 
 constricted  posteriorly,  not  retracted  into  prothorax;  back  of  head 
 faintly  cross-striated;  two  small  si)ines  in  front  of  anterior  ocelhis 
 and  one  in  front  of  each  posterior  ocellus;  a  })air  bordering  the 
 posterior  inner  side  of  each  eye.  Eyes  large,  ovoid,  i)rominent  and 
 protrudmg;  facets  large,  pilose.  Ocelli  located  in  central  part  of 
 head,  closely  placed  but  not  contiguous,  yellow,  with  orange-red 
 crescents;  anterior  ocellus  in  depression  on  fore  part  of  head  and 
 directed  forward.  Moutl-cone  short,  blunt,  tii)j)e(l  with  black; 
 maxillary  palju  with  three  segments,  labial  i)ali)i  witli  two.  Antennx 
 with  cigJit  segments,  two  and  one-half  times  as  long  as  head;  seg- 
 ment 1  palo  yellow,  2  orange-brown,  others  uniformly  brown; 
 spmes  and  sense  cones  present  but  not  conspicuous. 
 
DESCRIPTIONS   OF    NEW   GENERA   AND   SPECIES.  39 
 
 Prothorax  only  a  little  wider  than  head,  sides  arched,  all  anf^k;s 
 rounded ;  with  scattering  spines,  three  on  either  side  along  j)osteri()r 
 margin,  brown  and  conspicuous,  the  central  one  of  each  group  largest ; 
 sides  of  prothorax  constricted  in  middle.  Legs,  especially  })osterior 
 pair,  rather  long  and  slender,  covered  with  numerous  liairs,  unicolor- 
 ous  with  body.  Fore  wings  broadest  in  basal  one-third,  pointed  at 
 ends;  ring  vein  prominent,  fore  longitudinal  vein  conspicuous  only 
 at  base;  with  about  twenty  spines  along  anterior  margin;  live  or  six 
 spines  on  basal  part  of  fore  longitudinal  vein,  the  outer  two  separated 
 from  the  others;  three  spines  on  outer  half  of  wing  where  fore  vein 
 should  be  and  three  spines  near  posterior  margin  where  posterior  lon- 
 gitudinal vein  should  be.  Fringe  on  wing  on  both  anterior  and 
 posterior  margins  long  only  on  outer  half  of  wing.  Wings  brown,  with 
 inconspicuous,  hght,  longitudinal  area  extending  from  base  to  tip. 
 Abdomen  rather  long  and  slender,  spines  conspicuous  only  on  last 
 two  segments;  a  combHke  structure  on  posterior  margin  of  segment  8. 
 
 Described  from  numerous  specimens. 
 
 Habitat:   San  Francisco,  Cal. 
 
 Food  'plants:  Taken  on  various  hothouse  plants,  especially  on 
 Cathartica  sp  ? 
 
 Adults  and  larvse  collected  during  June  and  July. 
 (42)   Euthrips  albus  new  species.     (PI.  Ill,  figs.  20-22 ;  PI.  IV,  ^g,  30.) 
 
 Measurements:  Head,  length  0.12  mm.,  width  0.12  mm.;  pro- 
 thorax, length  0.12  mm.,  width  0.16  mm.;  mesothorax,  width  0.23 
 mm.;  abdomen,  width  0.25  mm.;  total  body,  length  1  mm. 
 
 Antenna:  1,  15  /z;  2,  30  /z;  3,  48  /i;  4,  45  p.',  5,  33  ix]  6,  54  /i; 
 7,  9  (x;  8,  12  //;  total  length  0.25  mm. 
 
 Color  translucent  wliitish,  segments  4  to  8  of  antennae  brown. 
 
 Head  about  as  wide  as  long,  noticeably  square,  cheeks  straight  and 
 very  slightly  arched;  front  angular;  spines,  except  a  pair  between 
 eyes,  weak.  Eyes  prominent,  black,  with  light  outer  borders, 
 coarsely  faceted.  Ocelli  wanting.  MoutJi-cone  long,  pointed,  tipped 
 with  black;  maxillary  palpi  three  -  segmented.  Antennx  eight-seg- 
 mented, about  twice  as  long  as  head,  segments  1  to  3  inclusive 
 whitish,  4  brown,  whitish  at  base,  others  brown.  Forked  sense  cone 
 on  dorsal  side  of  segment  3,  and  a  similar  one  on  ventral  side  of 
 segment  4. 
 
 Prothorax  somewhat  wider  than  long.  A  very  weak  spine  at  each 
 anterior  angle.  A  pair  of  prominent  ones  on  each  posterior  angle. 
 MesotJiorax  largest;  front  angles  rounded.  Legs  unicolorous  with 
 body.  Spines  prominent  only  on  hind  tibiae,  each  tarsus  with  a  black 
 spot  at  end.  Wings  present,  rather  broad,  and  tapering  gradually 
 from  base  to  distal  end;  not  sharply  pointed  at  tip;  costa  of  fore 
 wings  set  rather  sparsely  with  about  twenty  spines;  fore  vein  with 
 six  spines  near  base  of  wing  and  two  near  tip.     Hind  vein  with  nine 
 
*0  NORIH   AJIEEICAX    THYSANOPTEEA. 
 
 regularly  placed  spines,  these  beginning  immediately  below  where 
 the  group  of  sLx  spines  on  fore  vein  ends.     Spines  brown. 
 
 Abdomen  elongate-ovate,  tapering  rather  gradually  from  third 
 segment  to  near  tip;  with  prominent  spines  on  outer  posterior  angles 
 of  all  abdominal  segments  except  first. 
 
 Described  fmm  one  female  taken  on  peach  fohage,  Red  Bluff,  Cal. 
 (52)  Enthrips  helianthi  new  species.     (PI.  TV,  figs.  26-29  ) 
 
 Measurements:  Head,  length  0.135  mm.,  -nldth  0.'l6  mm.-  pro- 
 thorax,  length  0.150  mm.,  ^ridth  0.20  mm.;  mesothorax,  ^vidth 
 0.28  mm.;   abdomen,  %vidth  0.28  mm.;   total  body,  length  1.25  mm 
 
 Antenna:  1  21  /.;  2,  39  ;,;  3,  60  /<;  4,  51  /<;  5, 42  /<;  6,  54 ;«;  7,  9  ;<; 
 8,  lo  /;;  total  length  0.300  mm.  ^.     >     r, 
 
 General  color  transjjarent  yellowish-gray,  shaded  with  brown 
 Head  only  a  little  .rider  than  long,  cheeks  straight  and  paraUel- 
 antenor  margin  only  shghtly  elevated  and  rounded  in  front,  back  of 
 head  very  faintly  cross-striated.     Head  retracted  into  prothorax. 
 L,arge,  brown,  conspicuous  spines  in  front  of  posterior  ocelh  and  back 
 of  eyes;  other  smaller  spines  present,  also  dark  brown  and  conspicu- 
 ous     Eyes  rather  small,  occupying  about  one-half  the  width  of  the 
 head,    not   promment,     wdth   purple-black   pigment,    pilose.     OceUi 
 present,    translucent    wliitish,    separated,    and    posterior    ones    not 
 contiguous  to  eyes,  vvith  hght  orange-yellow  pigment  blotches  wliich 
 are    only   irregularly    crescent-shaped.      lloutJi-cone   pointed     dark 
 brown,  nearly  black  at  tip.     Maxillary  palpi  three-segmented,'  labial 
 palpi   two-segmented,    basal   segment   very   short.     Antennx  eight- 
 segmented   only  slightly  more  than  twice  as  long  as  head,  segment 
 1  light  yellowish  gray,  unicolorous  with  head;   2  dark  brown-  3   4 
 and  .5  brown,  yellowish  at  base;   3   also  sometimes  yellomsh  at  tip! 
 6  and  style  umform  dark  brown.     A  forked  sense  cone  on  dorsal  side 
 of  segment  3  near  tip,  and  a  similar  one  near  tip  on  ventral  side  of 
 segment  4.     All  spines  dark  brown  and  conspicuous 
 
 ProtJiorax  al>out  one-fourth  wider  than  long,  with  a  long,  consi>icu- 
 ous  dark-brown  spine  at  each  anterior  angle,  two  at  each  posterior 
 angle,  one  on  either  side  of  anterior  margin  about  halfway  between 
 center  and  side,  a  medium-sized  dark  spine  on  posterior  margin  on 
 either  side  near  center,  and  many  other  smaller  si.ines,  also  brown 
 and  conspicuous.     Mesothorax  with  angles  broadly  rounded  in  front 
 umting  almost  evenly   with  metathorax,   the  sides   of  which   con- 
 verge posteriorly.     Legs  with  fore  femora  somewhat  thickened,  li<dit 
 browmsh  gray;    all  tibia,  armed;    all  tarsi  with  a  dark-brown  spot 
 near  tij).      Wings  uniform  translucent  whitish.     Veins  set  regularly 
 with  spines;   costa  with  alx.ut  twenty-seven,  fore  vein  with  twenty- 
 one,  hmd  vem  with  fifteen,  scale  with  six,  inner  side  of  scale  witii  one- 
 all  s,,ines  brown.    Mic.„.s<„pic  hairs  transparent;  costal  fringe  short ': 
 posterior  fringe  long  and  wavy. 
 
 i 
 
LIBRARY 
 STATE  PLANT  BOARD 
 
 Tech.  Series  21,  Bureau  of  Entomology,  U.  S.  Dept.  of  Agriculture. 
 
 Plate  I. 
 
 North  American  Thysanoptera. 
 
 Fig.  l.-Erythrothrips  arizonx:  Head  and  thorax  of  female,  dorsal  view      Fig.  2.-Erythro- 
 Irips  aLn.:  xlp  of  abdomen  of  female,  dorsal  view.     Fig.  Z.-ErythrotJurps  arnon^ 
 Tip  of  abdomen  of  male,  dorsal  view.     Fig.  ^.-Erythrothrips  arizon^:  Right  fore  u  u 
 Fig.  ^.-Erythrothrips  arizon^:   Maxillary  palpus.     Fig.  ^.-Erythrothnps  anzon^.    Left 
 antenna.     Y\g.  I.—Erythrothrips  arizotm:  Larva.     (Original.) 
 
Tech.  Series  21,  Bureau  of  Entomology,  U.  S.  Dept.  of  Agriculture 
 
 Plate  II. 
 
 North  American  Thysanoptera. 
 
 Fig.  8. — Orothrips  kellogii:  Right  antenna.  Fig.  9. — Orotlirips  kdlogiiyosemitii:  Right  antenna. 
 Fig.  W.—  Thrips  magjiu.^:  Head  and  prothorax  of  female.  Fig.  11. —  Thrips  magnux:  Right 
 fore  wing.  Fig.  Vl.—Evthrips  citri:  Head  and  prothorax  of  female.  Fig.  13. — Euthrips  citri: 
 Tip  of  abdomen  of  female.  Fig.  14. — Euthrips  citri:  Right  antenna  of  female.  Fig.  15. — 
 Euthrips  citri:  Right  fore  wing.     (Original.) 
 
Tech.  Series  21,  Bureau  of  Entomology,  U.  S    Dc-pl  of  Apriculturp. 
 
 Plate  III. 
 
 V\/f\V\ 
 
 North  American  Thysanoptera. 
 
 Fig.  16.—Echinothrips  mexicanus: 
 
 Head  and  thorax  of  female,  dorsal  view.     Fig.  ll.—Ecliiao- 
 Fig.  IS.— Echinotln-ips  rncficanits: 
 
 thrips  mexicanus:  Tip  of  abdomen  of  female,  dorsal  view. 
 
 Right  fore  wing  of  female.     Fig.  \9.-Echinothrips  mexta.,.u.    ..,^...  ^^.... jj"^'rr^;,'r 
 
 Entfrrips  aWu.  Head  and  prothorax  of  female,  dorsal  ^^ew.     F.g  f -^"^^^^  ""l^^^^^  «^ 
 abdomen  of  female,  dorsal  view.    Fig.  22.-Euthrips  aWm:  Right  fore  .^  ing.     (Ongmal.) 
 
Tech.  Serias  21,  Bureau  of  Entomology,  U    S.  Dept    of  Agricultur 
 
 Plate  IV. 
 
 North  American  Thysanoptera. 
 
 Fig.  23. — Euthrips  parvus:  Head  and  thorax  of  female,  dorsal  view.  Fig.  24.— Euthrips  parvus: 
 Tip  of  abdomen  of  female,  dorsal  view.  Fig.  2b.—Euthrips  parvus:  Right  fore  wing  of 
 female.  Fig.  26. — Euthrips  hdianthi:  Head  and  prothorax  of  female,  dorsal  view.  Fig.  27.— 
 Enthrips  hdianthi:  Tip  of  abdomen  of  female,  dorsal  view.  Fig.  28. — Euthrips  hcliaiiihi: 
 Right  antenna  of  female.  Fig.  29.~Eiithrips  helianthi:  Right  fore  wing.  Fig.  SO.— Euthrips 
 albus:  Right  antenna  of  female.     (Original.) 
 
Tech.  Series  21,  Bureau  of   Entomology,  U.  S.  Dept.  of  Agriculture. 
 
 Plate  V. 
 
 North  American  Thysanoptera. 
 
 Fi^  ^1  -Anavhothrips  zex:  Head  and  prothorax  of  female,  dorsal  view.  Fig.  •i2.-Anapho- 
 VL  .el  X  of  abdomen  of  female,  dorsal  view.  Fig.  2^.-Anapkotf.ips  ..:  Right  fore 
 vving  YijA.-Anaphothrvmzex:  Right  antenna  of  female.  Fig.  35.-^«aMo^/ay.•^r.c.Zar.• 
 Head  and  prothorax  of  female,  dorsal  view.  Fig.  m.-A.apnoU.Hps  incolar:  T.p  of  abdomen 
 of  female  dor.al  view.  Y\g.^.-Ano^MiripsMcolov:  Right  fore  wing  of  female.  J^^^'^^-- 
 ^^;^ticolor:  Right  antenna  of  female.  Y^^.  Z^.-THckoiKHps  ruber:  Head  and 
 prothorax  of  female,  dorsal  view.     (Original.) 
 
Tech.  Series  21,  Bureau  of  Entomology,  U.  S.  Dept.  of  Agriculture. 
 
 Plate  VI. 
 
 North  American  Thysanoptera. 
 
 ■  Trichothrips  ruber:  Ri^ht 
 
 Fig   40- r/-Jc/wi/u7>w-»l;e/v  Tip  of  abdomen,  dorsal  view.     Fig.  41.  .         ,      .         , 
 
 of  female.    Fig.  4-l.—Ccphalothrips  erraiu:  Head  and  prothorax  of  female,  dorsal 
 -Cephalothrips  errans:  Tip  of  abdomen  of  female,  dorsal  view.     Fig.  44.— 
 Right  antenna  of  female.     Fig.  \h.—Cryptothrips  californiciw:      Head 
 and  protho'rax  of  female,  dorsal  view.     Fig.  i&.-Cryptothrips  cali/omicus:  Tip  of  abdomen 
 of  female,  dorsal  view.     (Original.) 
 
 antenna 
 view.     Fig.  43. 
 Cephalothrips  errans: 
 
DESCRIPTIONS   OF    NEW   GENERA   AND   SPECIES.  41 
 
 Abdomen  cylindrical  ovate,  with  c()ns])icii<)ns  brown  spines  on  outer 
 margin  of  eacli  segment,  six  along  the  ])ostenor  Y(5r]tral  margin  of 
 each  ventral  ])late,  and  longer,  stronger  ones  at  ti[)  on  segments  9 
 and  10. 
 
 Habitat:  VisaUa,  Tulare  County,  Cal. 
 
 Food  'plant:  Wild  sunflower. 
 (57)  Anaphothrips  zese  new  species.     (PI.  V,  figs.  31-34.) 
 
 Measurements:  Head,  length  0.12  mm.,  width  0.13  mm.;  ])rotho- 
 rax,  length  0.12  mm.,  width  0.16  mm.;  mesothorax,  width  0.23  mm.; 
 abdomen,  width  0.26  mm.;   total  length  1.10  mm. 
 
 Antennae:  1,  18  p.]  2,  30  p.]  3,  42  /x;  4,  39  //;  5,  33  //;  6,  30  [x]  7,  8, 
 9,  33  /£;   total  length  0.225  mm. 
 
 Color  yellow  to  grayish  brown,  wings  gray. 
 
 Head  about  as  long  as  wide,  broadly  rounded,  in  front,  cheeks 
 arched.  Eyes  prominent,  slightly  protruding,  with  coarse  facets. 
 Ocelli  present,  widely  separated,  with  light-brown  crescents.  Head 
 with  prominent  spines.  Moutli-cone  broad  at  base,  pointed  at  tip. 
 Maxillary  palpi  large,  three-segmented,  labial  palpi  very  small,  with 
 two  segments,  mouth-cone  dark  brown  at  tip.  Antennx  about  as 
 long  as  head,  segment  1  yellowish  gray,  segment  2  light  brown, 
 segment  3  light  brown,  transparent  yellowish  at  basal  half,  segment 
 4  and  others  light  brown,  shading  to  darker  toward  the  tip,  without 
 conspicuous  spines  or  sense  cones.  Antennae  sometimes  almost  uni- 
 formly light  brown,  with  segment  2  darker. 
 
 Prothorax  about  as  long  as  head  and  only  slightly  wider,  with  one 
 transparent  but  rather  prominent  spine  on  each  posterior  angle. 
 MesotJiorax  largest,  sides  rounded;  metatJiorax  with  sides  almost 
 parallel  but  constricted  abruptly  at  the  posterior  margin.  Pter- 
 thorax  somewhat  darker  than  rest  of  body.  Legs  uniformly  grayish 
 brown,  only  hind  tibia  armed.  Wings  uniformly  brownish  gray, 
 with  small,  semitransparent,  elongate  area  near  base  with  veins  and 
 spines  prominent,  although  all  veins  are  transparent.  Costa  with 
 twenty-seven  spines,  fore  vein  with  nine  regularly  placed  spines  near 
 base  and  other  scattered  spines  along  outer  part.  Hind  vein  arising 
 from  fore  vein  at  about  one-fourth  the  wing's  length  from  the  base 
 and  ending  abruptly  near  tip  of  wing  with  ten  more  or  less  regu- 
 larly placed  spines.     Fringe  on  fore  vein  weak. 
 
 Abdomen  cyhndrical  ovate,  uniformly  brownish  gray,  without 
 prominent  spines  except  on  terminal  segments;  all  spines 
 transparent. 
 
 Habitat:  San  Jose,  Fresno,  Lindsay,  Tulare  County,  Cal.     Taken  on 
 grasses,  leaves,  and  ears  of  corn. 
 (58)  Anaphothrips  tricolor  new  species.     (PI.  V,  figs.  35-38.) 
 
 Measurements:  Head,  length  0.10  mm.,  width  0.15  mm. ;  prothorax, 
 length  0.13  mm.,  width  0.18  mm.;  mesothorax,  width  0.23  mm.; 
 
42  NOETH  AMERICAN   THYSANOPTERA. 
 
 abdomen,  width  0.25  mm.;  total  length  1.16  mm.  Antennae:  1,  12;(; 
 2,  30  11]  3,  39 /i;  4,  30 /i;  5,  30//;  6,  30  /t:  7,  8,  9,  33  //;  total  length 
 0.21  mm. 
 
 Color:  Head  and  pro  thorax  grayish  yellow;  pterthorax  orange; 
 abdomen  brown,  shading  to  darker  toward  tip. 
 
 Head  considerably  wider  than  long,  cheeks  almost  straight  and 
 diverging  behind.  Front  of  head  broadly  rounded;  back  of  head 
 very  faintly  cross-striated,  without  prominent  spines.  Eyes  promi- 
 nent, black,  occupying  almost  two-thirds  of  width  of  head.  Ocelli 
 present,  with  light-brov^^n  inner  crescents.  Mouth-cone  long  and 
 slender,  reaching  almost  to  posterior  margin  of  prothorax,  tipped 
 with  black.  Maxillary  palpi  three-segmented,  labial  palpi  two- 
 segmented,  basal  segment  very  short,  second  segment  very  long. 
 Antennx  apparently  with  nine  segments,  only  sHghtly  more  than 
 twice  as  long  as  head,  segments  1,  2,  3,  and  base  of  4  unicolorous  with. 
 head,  segment  2  shaded  mth  brown,  tip  of  4  and  others  shading  quite 
 uniformly  to  dark  brown,  all  spines  transparent. 
 
 Prothorax  with  angles  broadly  rounded,  unicolorous  with  head,  with 
 one  prominent  spine  on  each  posterior  angle ;  other  smaller  spines  are 
 present  but  all  are  transparent.  Mesothorax  and  metatliorax  united 
 evenly  at  sides  and  conspicuously  orange-colored.  Legs  slender, 
 grayish  yellow,  unicolorous  with  head,  all  tibiae  armed.  Wings,  includ- 
 ing veins  and  spines,  transparent.  Veins  prominent.  Costa  with 
 twenty-five  regularly  placed  spines,  fore  vein  with  a  group  of  about 
 eight  spines  on  basal  half  and  two  or  three  scattered  spines  near  tip. 
 Posterior  longitudinal  veins  arising  from  fore  veins  at  about  one- 
 tliird  the  wing's  length  from  the  base  and  ending  abruptly  near 
 tip  of  mng  with  about  ten  regularly  placed  spines ;  fringe  on  anterior 
 pair  of  wings  slight. 
 
 Abdomen  with  segments  2  to  6,  inclusive,  almost  equal  and  with  sides 
 parallel.  Segments  8,  9,  and  10  with  sides  abruptly  converging  to 
 meet  the  smaller  pointed  tenth  segment.  Surface  of  abdomen  cross- 
 striated.  Posterior  margins  of  dorsal  plates  of  segments  5  to  8, 
 inclusive,  with  arrangement  of  short,  sharp  spines;  these  are  most 
 consj)icuous  on  segments  7  and  8.  Abdomen  dark  brown,  shading 
 to  darker  toward  tip,  all  spines  of  abdomen  dark  brown. 
 
 JIahitat:  Tulare  County,  Cal.     Taken  on  goldenrod   and   orange 
 foliage.     Specimens  collected  by  Mr.  P.  K.  Jones. 
 (75)  Trichothrips  ruber  new  species.     (PI.  V,  ^^^.  39;  PL  VI,  fig.  40.) 
 
 Measurements:  Head,  length  0.18  mm.,  width  0.1 9  mm. ;  j)rothorax, 
 length  0.14  nmi.,  widtli  0.28  mm.;  mesothorax,  width  0.33  mm.; 
 abdomen,  widtli  ().:>3  mm.;  tube  length  0.12  mm.;  total  body,  length 
 1.42mm.  Antenna-  1,  18/z;  2,42/z;  3,3G/z;  4,48//;  5,42/^;  6,39//; 
 7,  33  //;  8,  21  //;  total  0.28  mm. 
 
DESCRIPTIONS   OF   NEW   GENERA  AND   SPECIES.  43 
 
 General  color  uniform  dark  browiiisli-rod.  Antonnso  dark  ])r()wii, 
 legs  brown,  tips  of  foro  iWmv.  and  fon^  tarsi  y(»llow. 
 
 Head  about  as  long  as  wide,  broadly  rounded  in  front,  cheeks  slightly 
 arched,  back  of  head  cross-striated;  postocular  spines  long  and  with 
 blunt  tips.  Eyes  large,  semitriangular  in  shape,  slightly  protruding, 
 black,  with  bright-yellow  outer  borders,  pilose.  Ocelli  present,  sit- 
 uated far  forward,  anterior  one  on  vertex;  posterior  ocelli  contiguous 
 with  inner  anterior  margins  of  eyes,  red,  with  reddish-black  crescents. 
 Mouth-cone  short,  pointed,  not  reaching  across  prostemum,  maxillary 
 palpus  with  two  segments.  Antennx  with  eight  segments,  one  and 
 five-tenths  times  as  long  as  head,  dark  brown,  except  segment  3,  w^hich 
 is  lighter;  segments  increasing  in  size  gradually  until  the  fourth, 
 which  is  largest,  and  then  gradually  diminishing  toward  the  tip ;  all 
 spines  and  sense  cones  transparent,  three  sense  cones  on  segment  4, 
 two  smaller  ones  on  segment  5. 
 
 Protliorax  with  sides  diverging  posteriorly,  widest  near  the  back. 
 The  fore  coxse  are  broadly  rounded  and  prominent  and  form  what 
 appear  to  be  the  posterior  angles  of  the  prothorax;  long  blunt  spines 
 on  anterior  and  posterior  angles,  on  sides  and  on  prominent  coxae; 
 other  spines  not  conspicuous.  Pterthorax  largest.  Legs  rather  slender, 
 without  conspicuous  spines  or  markings ;  only  a  very  small  claw  on 
 each  fore  tarsus.  Wings  long,  slender,  transparent  except  where 
 light  brown  at  extreme  base  above. 
 
 Abdomen'ynth.  segments  2  to  6,  inclusive,  about  equal,  after  which 
 they  decrease  gradually  until  the  tube.  Segments  2  to  8  each  with 
 two  long,  blunt  hairs  on  posterior  angles.  Segments  2  to  7  each  with. 
 a  pair  of  strong,  brown,  inwardly  curved  spines  on  either  side  half 
 way  from  center  to  margin;  other  spines  smaller  and  not  conspicuous. 
 Hairs  on  terminal  segments  long  and  slender. 
 
 Described  from  a  single  female. 
 
 Habitat:  San  Jose,  Cal. 
 
 Taken  in  blossoms  of  azalea,  in  May. 
 (92)   Cephalothrips  errans  new  species.     (PL  VI,  figs.  42-44.) 
 
 Measurements  of  two  wingless  females:  Head,  length  0.18  mm.,  width 
 0.13  mm.;  prothorax,  length  0.12  mm.,  width  (including  prominent 
 fore  coxa)  0.22  mm.;  mesothorax,  width  0.20  mm.;  abdomen,  width 
 0.28  mm.;  tube  length  0.10  mm.;  total  body,  length  1.16  mm. 
 Antenna:  1,  18  /^;  2,  39  [i;  3,  39  /z;  4,  45  p.',  5,  45  //;  6,  39  //;  7,  39  /£; 
 8,  24  //;  total  length  0.28  mm. 
 
 .  Three  specimens  of  the  winged  male  of  this  species  show  the  follow- 
 ing variations:  Prothorax,  length  0.14  mm.,  width  0.26  mm.;  meso- 
 thorax, width  0.25  mm.;  total  length  1.86  mm.  when  the  body  is  dis- 
 tended. Antennae:  1,  21  fi',  2,  45  /t;  3,  45  /^;  4,  48  /z;  5,  42  //;  6,  39  }i\ 
 7,  45  ii\  8,  30  li. 
 
44  NORTH   AMERICAN    THYSAXOPTEEA. 
 
 General  color  uniform  dark  brown  except  tips  of  all  tibiae  and  all 
 tai'si,  wliicli  are  yellowish.  Wings  (in  the  forms  wliicli  have  \\ings) 
 transparent. 
 
 Head  about  four-tenths  longer  than  wide,  broadly  rounded  in  front 
 except  at  vertex,  which  projects  forward  between  basal  segments  of 
 antennae;  cheeks  almost  straight,  without  markings  and  without 
 spines  other  than  the  long,  transparent,  blunt,  postocular  ones.  Eyes 
 somewhat  triangular  in  shape,  prominent  but  not  protruding,  black, 
 with  lemon-yellow  outer  margins,  not  pilose.  Ocelli  present,  situated 
 far  forward  on  head,  each  posterior  one  contiguous  with  inner 
 anterior  margin  of  eye,  slightly  reddish-brown,  %vith  darker  crescents ; 
 anterior  ocellus  smaller  and  with  pigment,  elongate  and  not  crescent 
 shaped.  Moutli-cone  a  Uttle  shorter  than  its  -s^ddth  at  base;  maxillary 
 palpus  two-segmented,  basal  segment  very  small,  second  segment 
 long;  labium  broadly  rounded.  Antennae,  with  eight  segments,  one 
 and  one-half  times  as  long  as  head,  uniform  dark  brown  except 
 segment  3,  wliich  is  light  brown  and  somewhat  yellowish  at  base; 
 spines  and  sense  cones  present  but  not  conspicuous;  segments  7  and 
 8  closely  joined. 
 
 Prothorax  about  seven-tenths  as  long  as  head;  sides  (including 
 prominent  coxa)  diverging  rapidly  from  the  anterior  margin  to  about 
 three-fourths  the  length  and  then  abrupth'  constricted,  the  outer 
 angles  thus  formed  broadly  rounded.  With  three  pairs  of  long,  blunt 
 spines  on  fore  and  liind  angles  and  one  midway  along  sides;  also 
 similar  spine  on  each  prominent  fore  coxa.  Ptertliorax  with  sides 
 almost  even  and  parallel,  a  little  narrower  than  prothorax  but  much 
 wider  than  head;  almost  as  wide  as  prothorax  in  mnged  forms. 
 Legs  short,  stout,  each  fore  tibia  with  a  small  tooth.  Wings  (in 
 winged  forms)  very  weak,  hardly  attaining  half  the  length  of  the 
 abdomen,  transparent,  and  hardly  to  be  seen  except  for  very  light 
 brownish  area  at  extreme  base. 
 
 Spines  on  sides  of  ahdomen  long  and  transparent,  those  on  tip  of  tube 
 brown. 
 
 Described  from  two  wingless  and  three  winged  fcMuales. 
 
 Ilahitat:  San  Jose,  Cal. 
 
 Food  plants:  Wild  mustard,  apricot,  and  })ruiie  foliage. 
 
 Adults  taken  from  April  to  July. 
 
46 
 
 BIBLIOGRAPHY  OF  RECENT  PUBLICATIONS. 
 
 Cary,  Lewis  K. 
 
 1902.  The  grass  thrips  (Anaphothrips  striata  Oflborn).     <Maine  Agr.  Exp.  Sta., 
 
 Bui.  83,  June. 
 Crawford,  D.  L. 
 
 1909.  Some  new  Thysanoptera  from  southern  California.     Some  Thysanoptera  of 
 
 Mexico  and  the  South.     Notes  on  California  Thysanoptera.     <Pomona 
 College,  Journ.  Ent.,  vol.  1,  no.  4,  pp.  100-121,  figs.,  December. 
 
 1910.  Thysanoptera  of  Mexico  and  the  South,  II.     <Pomona  College,  Journ. 
 
 Ent.,  vol.  2,  no.  1,  p.  153,  March. 
 Daniel,  S.  M. 
 
 1904.     New    California   Thysanoptera.     <Ent.    News,    vol.    15,    pp.    293-297, 
 November. 
 Fernald,  H.  T.,  and  Hinds,  W.  E. 
 
 1900.    The  grass  thrips.     <Mass.  Agr.  Coll.,  Bui.  67,  May,  1900. 
 Foster,  S.  W.,  and  Jones,  P.  P. 
 
 1911.  How  to  control  the  pear  thrips.     <U.  S.  Dept.  Agr.,  Bur.  Ent.,  Cir.  131, 
 
 pp.  ii+24,  figs.  15,  January  9. 
 Franklin,  H.  J. 
 
 1903.  Notes  on  Acanthothrips.    <Psyche,  vol.  10,  pp.  221-223,  October-Decem- 
 
 ber, 1903. 
 
 1908,  On  a  collection  of  thysanopterous  insects  from  Barbados  and  St.  Vincent 
 
 Islands.     <Proc.  U.  S.  Nat.  Mus.,  vol.  33,  pp.  715-730,  pis.  63-65, 
 March. 
 
 1909.  On  Thysanoptera.     <Ent.  News,  vol.  20,  pp.  228-231,  May. 
 Hinds,  Warren  Elmer. 
 
 1902.     Contribution  to  a  monograph  of  the  insects  of  the  Order  Thysanoptera 
 
 inhabiting  North  America.     <Proc.  U.  S.  Nat.  Mus.,  vol.  26,  pp.  79-242, 
 
 pis.  1-11. 
 Hood,  J.  Douglas. 
 
 1908.     New  genera  and  species  of  Illinois  Thysanoptera.     <Bul.  111.  State  Lab. 
 
 Nat.  Hist.,  vol.  8,  art.  2,  pp.  361-378,  figs.,  August. 
 1908.     Two  new  species  of  Idolothrips.     <Ann.  Ent.  Soc.  Amer.,  vol.  1,  p.  284, 
 
 figs.,  December. 
 
 1908.  Three  new  North  American  Phloeothripidae.     <Can.  Ent.,  vol.  40,  no.  9, 
 
 p.  305,  figs. 
 
 1909.  Two  new  North  American  Phloeothripidae.     <Ent.  News,  vol.  20,  pp. 
 
 28-32,  figs.,  January. 
 1909.     A  new  genus  and  a  new  species  of  North  American  Phloeothripidae.     ^Ent. 
 News,  vol.  20,  pp.  249-252,  figs.,  June. 
 Hooker,  W.  A. 
 
 1906.  The  tobacco  thrips  and  remedies  to  prevent  "white  veins"  in  wrapper 
 
 tobacco.     <U.  S.  Dept.  Agr.,  Bur.  Ent.,  Cir.  68,  pp.  5,  figs.  2,  February. 
 
 1907,  The  tobacco  thrips,  a  new  and  destructive  enemy  of  shade-grown  tobacco. 
 
 <U.  S.  Dept.  Agr.,  Bur.  Ent.,  Bui.  65,  p.  24,  figs.,  April. 
 Jones,  P.  R.,  and  Horton,  J.  R. 
 
 1911,  The  orange  thrips :  Areportof  progress  for  the  years  1909  and  1910.  <U.  S, 
 Dept.  Agr.,  Bur.  Ent.,  Bui.  99,  Pt.  I,  pp.  i-iv+1-16,  pis.  1-3,  figs.  1-2, 
 March  6, 
 
46  NORTH   AMERICAN    THYSANOPTERA. 
 
 MouLTOX,  Dudley. 
 
 1907.     The  pear  thrips.     <U.  S.  Dept.  Agr.,  Bur.  Ent.,  Bui.  68,  Pt.  I,  pp.  1-16, 
 
 figs.  1-8,  pis.  1,  2,  June  10.    . 
 1907.     A  contribution  to  our  knowledge  of  the  Thysanoptera  of  California.    <U.  S. 
 
 Dept.  Agr.,  Bur.  Ent.,  Tech.  Ser.  12,  Pt.  Ill,  pp.  39-68,  pis.  1-6,  April  5. 
 1909.     The  orange  thrips.     <U.  S.  Dept.  Agr.,  Bur.  Ent.,  Tech.  Ser.  12,  Pt.  VII, 
 
 pp.  119-122,  pi.  8,  February  11. 
 1909.     The  pear  thrips  and  its  control.     <U.  S.  Dept.  Agr.,  Bur.  Ent.,  Bui.  80, 
 
 Pt.  VI,  pp.  51-66,  figs.  13-17,  pis.  4-6,  September  1. 
 1909.    The  pear  thrips.     <U.  S.  Dept.  Agr.,  Bur.  Ent.,  Bui.  68,  Pt.  I,  revised, 
 
 pp.  1-16,  figs.  1-8,  pis.  1-2,  September  20. 
 
 QUAINTANCE,  A.  L. 
 
 1898.     The  strawberry  thrips  and  the  onion  thrips.     <Plorida  Agr.  Exp.  Sta., 
 Bui.  46,  July. 
 Russell,  II.  M. 
 
 1909.     The  greenhouse  thrips.     <U.  S.  Dept.  Agr..  Bur.  Ent.,  Bui.  64,  Pt.  VI, 
 pp.  43-60,  figs.  15-17,  August  4. 
 Shull,  a.  Franklin. 
 
 1909.     Some  apparently  new  Thysanoptera  from  Michigan.     <Ent.  News,  vol. 
 20,  pp.  220-228,  figs.,  May. 
 
IXDl-X 
 
 [New  genera  and  species  and  pages  on  which  they  are  described  are  given  In  black-faced  type.] 
 
 Page. 
 
 Abies  sp.,  Idolothrips  coniferarum  taken  thereon 34 
 
 Acanthothrips 13, 19,  31 
 
 albivittatus 19,  31 
 
 doanei 19,  31 
 
 magnafemoralis 19,  31 
 
 nodicornis 19,  31 
 
 Acer  {see  also  Maple). 
 
 Acer  saccharum,  food  plant  of  Trichothrips  smithi 30 
 
 Achillea  millefolium,  food  plant  of  Anthothrips  niger 29 
 
 Adenostoma  fasciculatum  {see  also  Chamisal). 
 
 food  plant  of  ^olothrips  huwanaii 22 
 
 Cryptothrips  californicus 32 
 
 .EOLOTHRIPID.E 10,  11 
 
 ^olothrips 11,13-14,21-22 
 
 hicolor 13,  21 
 
 fasciatus 14,  22 
 
 huwanaii 14,  22 
 
 var.  rohustus,  -withdrawn 22 
 
 longiceps 14,  22 
 
 vespiformis 13,  21 
 
 JEsculus  californica,  food  plant  of  ^olothrips  fasciatus 22 
 
 AleurodotJirips 12,  29 
 
 fasciapennis,  enemy  of  Aleyrodes  citri 29 
 
 Aleyroies  citri,  preyed  upon  by  Aleurodothrips  fasciapennis 29 
 
 Alfalfa,  food  plant  of  JEolothrips  fasciatus 22 
 
 Anaphothrips  striatus 28 
 
 Heliothrips  fasciatus 24 
 
 Allothrips 12,  29 
 
 megacephalus 29 
 
 Almond,  food  plant  of  Euthrips  pyri 26 
 
 Amarillis  sp.,  food  plant  of  Heliothrips  femoralis 23 
 
 Anaphothrips 12, 16-17,  28 
 
 hesperus 17 
 
 striatus 9,16,28 
 
 tricolor 17,  28,  41-42 
 
 zese 28,41 
 
 Anhothrips 11,  21 
 
 rohustus 21 
 
 Anthothrips 12, 17,  29 
 
 niger 17,  29 
 
 variabilis 17,  29 
 
 verbasd 17,  29 
 
 Apple,  food  plant  of  Euthrips  pyri 26 
 
 Liothrips  mcconnelli 33 
 
 47 
 
48  NORTH   AMERICAN    THYSANOPTERA. 
 
 Page. 
 
 Apricot,  food  plant  of  Cephalothrips  errans 31, 44 
 
 Euthrips  pijri. 26 
 
 Trichothrips  dens 30 
 
 Aptinothrips 12,  25 
 
 rufus 25 
 
 var.  connatticornis 11 
 
 Aralia  sp.,  food  plant  of  Heliothrips  femoralis 23 
 
 Parthenothrips  dracsenx 22 
 
 Arbutus  menziesii,  food  plant  of  Oroihrips  helloggii 21 
 
 Thrips  madronii 22 
 
 Arisseina  triphyllum,  food  plant  of  Heterothrips  arisxmx 28 
 
 Arrowroot,  food  plant  of  Euthrips  insularis 27 
 
 Artemisia  sp.,  food  plant  of  ^olothrips  longiceps 22 
 
 Arum  sp.,  food  plant  of  Ilcliothrips  femoralis 23 
 
 Aspidium  sp.,  food  plant  of  Heliothrips  haemorrhoidalis 23 
 
 Aster,  food  plant  of  Pseudothrips  inequalis 28 
 
 Aialea,  food  plant  of  Heliothrips  haemorrhoidalis 23 
 
 Trichothrips  ruber 30 
 
 western.     (See  Rhododendron  occidentale.) 
 
 Baliothrips 11,  22 
 
 hasalis 22 
 
 Beans,  food  plant  of  Euthrips  insularis 27 
 
 Scolothrips  sexmaculatus 20 
 
 Beet,  food  plant  of  Heliothrips  fasciatus 24 
 
 sugar,  food  plant  of  JEolothrips  fasciatus 22 
 
 Bibliography  of  recent  publications  on  North  American  Thysanoptera 44^6 
 
 Bindweed,  food  plant  of  Molothrips  bicolor 21 
 
 Birch  limb,  dead,  Megalothrips  (?)  spinosiis  taken  under  bark 34 
 
 Blackberry,  food  plant  of  Scolothrips  sexmaculatus 26 
 
 Brunella  vulgaris,  food  plant  of  ^olothrips  bicolor 21 
 
 Buckeye,  California.     {See  JEsculus  calif ornica.) 
 
 Buckthorn,  food  plant  of  Sericothrips  variabilis 24 
 
 Buckwheat,  food  plant  of  ^olothrips  fasciatus 22 
 
 wild  (see  also  Erigonum  fasciculatum) . 
 
 food  plant  of  Liothrips  fasdculatus  stenoceps 33 
 
 Buttercups,  food  plant  of  Euthrips  minutus 27 
 
 Cacao,  food  plant  of  Heliothrips  haemorrhoidalis 23 
 
 Carrots,  wild,  food  plant  of  Chirothrips  manicatus 25 
 
 Cathartica  sp.,  food  plant  of  Euthrips  parvus 39 
 
 Catalogue  of  North  American  Thysanoptera 21-34 
 
 Ceanothus  ep.,  food  plant  of  Anhothrips  robustus ^ 21 
 
 Orothrips  kelloggii  yosemilii 21 
 
 Sericothrips  variabilis 21 
 
 thyrsiflorus  food  plant  of  JEolothrips  kuwanaii 22 
 
 Thrips  madronii 22 
 
 Celery,  food  plant  of  JEololhrips  fasciatus 22 
 
 ( !olosa,  food  plant  of  Anthothrips  variabilis 29 
 
 Cephalothrips i''\  19>  31 
 
 errans 19.  31,  43-44 
 
 yucc.ii' 19,  31 
 
 ( lereals,  food  i)lant8  of  Chirothrips  manicatus 25 
 
 Cestrum  nocturnum,  food  jjlant  of  Heliothrips  femoralis -  23 
 
 Chanivcdoreafragrans,  food  plant  of  Euthrips  orchidii 26 
 
INDEX.  49 
 
 rage. 
 Chamisal  (see  also  Adcnostorna  fasciculalum) . 
 
 food  plant  of  Euthrips  minutus 27 
 
 Cherry,  food  plant  of  Euthrips  minutus 27 
 
 pyri •- 2G 
 
 Chirothrips 12, 15  25 
 
 crassus 15,25 
 
 manicatus 15,  25 
 
 mexicanus 15,  25 
 
 obesus 15,  25 
 
 Christmas  berry.     (See  Heteromeles  arhuiifolia.) 
 
 Chrysanthemum  leucanthemum,  food  plant  of  JSolothrips  fascia tus 22 
 
 sp.,  food  plant  of  Ueliothrips  femoralis 23 
 
 Citrus  sp.,  food  plant  of  Euthrips  citri 26 
 
 Classification  of  North  American  Thysanoptera 10-21 
 
 Clover,  burr,  food  plant  of  Ueliothrips  fasciatus 24 
 
 food  plant  of  Molothrips  fasciatus 22 
 
 Chirothrips  manicatus 25 
 
 Phlceothrips  uzeli 32 
 
 red,  food  plant  of  Anthothrips  niger 29 
 
 white,  food  plant  of  Anthothrips  niger 29 
 
 Compositse,  food  plants  of  JEolothrips  fasciatus 22 
 
 Euthrips  cephalicus 27 
 
 insularis 27 
 
 Thrips  abdominalis 23 
 
 Convolvulus  sp.,  food  plant  of  Euthrips  insularis 27 
 
 Corn,  food  plant  of  Anaphothrips  striatus 28 
 
 zese 28, 47 
 
 Euthrips  nervosum 27 
 
 Thrips  perplexus 23 
 
 Cornus  stolonifera,  food  plant  of  Scirtothrips  ruthveni 26 
 
 Crinum  sp.,  food  plant  of  Heliothrips  femoralis 23 
 
 Croton  spp.,  food  plants  of  Heliothrips  hxmorrhoidalis 23 
 
 Cryptothrips 13, 19,  32 
 
 asperus=Leptothrips  asperus  calif ornicus 19,  32 
 
 taken  under  old  shells  of 
 
 Lecanium  corni 32 
 
 taken  under  old  shells  of 
 
 Saissetia  olex 32 
 
 carhonarius 19,  32 
 
 fasciapennis=Aleurodothripsfasciapennis  rectangularis 19,  32 
 
 Cucumber,  food  plant  of  Heliothrips  femoralis 23 
 
 Sericothrips  variabilis 24 
 
 Cycas  revoluta,  food  plant  of  Parthenothrips  dracsenae 22 
 
 Cyperus  sp.?  food  plant  of  Thrips  perplexus 23 
 
 Dahlia  spp.,  food  plants  of  Heliothrips  hxmorrhoidalis 23 
 
 Daisy,  oxeye,  food  plant  of  Anthothrips  niger 29 
 
 Daucus  sp.?  food  plant  of  Thrips  abdominalis 23 
 
 Descriptions  of  new  genera  and  new  species  of  Thysanoptera 34 
 
 Dictothrips H.  24 
 
 reticulatus 24 
 
 Diplacus  glutinosus,  food  plant  of  ^olothrips  fasciatus 22 
 
 Dodder,  food  plant  of  Anthothrips  variabilis 29 
 
 71924°— 11 4 
 
50  NOETH  AMERICAN   THYSANOPTERA. 
 
 Page. 
 Dogwood.     (See  Cornus  stolonifera.) 
 
 Dracxna  sp.,  food  plant  of  Heliothrips  femoralis 23 
 
 Parthenothrips  dracaenx 22 
 
 Echinothrips 11,  24,  37 
 
 mexicanus 24,  37-38 
 
 Elderberry.     (See  Sambucus  glauca.) 
 
 Elm,  food  plant  of  Scolothrips  sexmaculatus 26 
 
 Erigonum  fasciculatum,  food  plant  of  Liothrips  fasciculatus 33 
 
 Erythrothrips 11, 21,  34-35 
 
 arizonsB 21,  35-36 
 
 Eucharis  grandijlora,  food  plant  of  Ileliothrips  femoralis 23 
 
 Eurythrips 12, 17, 29 
 
 ampliventralis 17, 29 
 
 osbomi 17,  29 
 
 Euthrips 12, 15-16,  26-28 
 
 albus 15,  26,  39-40 
 
 cephalicus 16,  27 
 
 reticulatus 16,  27 
 
 citri 9, 15,  26 
 
 ehrhorni 15,  26 
 
 fuscus 9, 16,  27 
 
 heHanthi 16,27,  40-41 
 
 insularis 16,  27 
 
 reticulatus= Euthrips  insularis 27 
 
 minutus 16,  27 
 
 setosu^= Euthrips  minutus 27 
 
 nervosus 16,  27 
 
 nicotianx= Euthrips  fuscus 27 
 
 ocddentalis 16,  27 
 
 orchidii 15,  26 
 
 parvus 15,  26,  38-39 
 
 pyri 9, 15,  26 
 
 tritici 9, 16,  28 
 
 califomicus 16,  28 
 
 taken  with  Euthrips  tritici  on  flowers 28 
 
 ulicis  califomicus 16,27 
 
 Ferns,  food  plants  of  Ileliothrips  hxmorrhoidalis 23 
 
 Festuca  ovina,  food  plant  of  Chirothrips  ohesus 25 
 
 pratensis,  food  plant  of  Limothrips  cerealium 25 
 
 Ficaria  sp.,  food  plant  of  Euthrips  orchidii 26 
 
 Ficus  elastica,  food  plant  of  Ileliolhrips  femoralis 23 
 
 Parthenothrips  dracacnx 22 
 
 grandiflora,  food  plant  of  Ileliothrips  femoralis 23 
 
 nitida,  Liothrips  hakeri  taken  in  galls  on  leaves 33 
 
 religiosa,  Liothrips  bakcri  taken  in  galls  on  flowers 33 
 
 Fig,  food  plant  of  Euthrips  pyri 26 
 
 Thrips  bremncrii 23 
 
 Flowers,  food  plants  of  Thrips  tabaci 23 
 
 spring,  food  plants  of  Euthrips  nervosus 27 
 
 wild,  food  plants  of  Euthrips  tritici 28 
 
 Fruit  blossoms,  food  of  Thrips  tabaci 23 
 
 Galls,  on  Ficus  nitida  heaves,  Liothrips  bakcri  taken  thereon 33 
 
 religiosa  flowers,  Liothrips  bakeri  taken  therein '. .         33 
 
 oak,  Liothrips  umbripennis  mexicanus  tuken  thereon 33 
 
INDEX.  51 
 
 Gall,  on  Solidago,  Idolothrips  armatus  tak(m  fhoroin :i4 
 
 Zj/gothrips  longireps  lak(!ii  lh(!r(;iii 32 
 
 pine-cone,  on  willow,  Trirholhrips  hrcricuralis  thonan 30 
 
 Gardenia  Bp.,  food  plant  of  Ileliolhripsfcmoralis 23 
 
 Gnorimoschcina  gallaesolidaginis,    on   Solidago  canadensis,    Idolothrips  armatus 
 
 taken  in  galls 34 
 
 Goldenrod  (see  also  Solidago). 
 
 food  plant  of  Anaphothrips  tricolor 28 
 
 Cephalothrips  yuccx 31 
 
 Gossypium  ep.,  food  plant  of  Ueliothrips  femoralis 23 
 
 Grape  (see  also  Vitis). 
 
 food  plant  of  Euthrips  pyri 26 
 
 Leptothrips  asperus  taken  thereon 32 
 
 wild,  food  plant  of  Liothrips  citricornis 33 
 
 Grass,  millet.     (See  Milium  effusum.) 
 
 ' ' old  witch, ' '  food  plant  of  Chirothrips  crassus 25 
 
 Groundnut,  food  plant  of  Euthrips  insularis 27 
 
 Heliothrips 11, 14,  23-24 
 
 fasciapennis 14,  24 
 
 fasciatus 9, 14,  23 
 
 femoralis 14,  23 
 
 hxmorrhoidalis 9, 14,  23 
 
 Heteromeles  arbutifolia,  food  plant  of  Trichothrips  ilex 30 
 
 Heterothrips 12, 17,  28-29 
 
 arisaemae 17,  28 
 
 decacornis 17,  29 
 
 salids 17,  28 
 
 Hickory,  food  plant  of  Liothrips  citricornis 33 
 
 Hop,  food  plant  of  Scolothrips  sexmaculatus 26 
 
 Hop-tree.     (See  Ptelea  trifoliata.) 
 
 Hydrangea  sp.,  food  plant  of  Heliothrips  femoralis 23 
 
 Idolothrips 13,  20-21,  33-34 
 
 angusticeps 20,  34 
 
 armatus 21,  34 
 
 coniferarum 20,  34 
 
 flavipes 20,  33 
 
 tuberculatum 21,  34 
 
 Jack-in-the-pulpit.     (See  Arissema  triphyllum.) 
 
 Juniperus  virginiana,  Idolothrips  coniferarum  taken  thereon 34 
 
 Kentia  belmoreana,  food  plant  of  Parthenothrips  dracaense 22 
 
 Key  to  genera 11-13 
 
 species 13-21 
 
 suborders  and  families 10-11 
 
 Labiatse,  food  plant  of  Euthrips  cephalicus  reticulatus 27 
 
 Laurel,  California.     (See  Umbellularia  californica.) 
 mountain.     (See  Umbellularia  californica.) 
 
 Laurestinas,  food  plants  of  Heliothrips  hxmorrhoidalis 23 
 
 Lecanium  corni  (arraeniacum),  Cryptothrips  calif ornkus  taken  from  under  old 
 
 shells 32 
 
 Legumes,  food  plants  of  Euthrips  insularis 27 
 
 Lemon,  food  plant  of  Thrips  madronii 22 
 
 Leptothrips 1^,2,2 
 
 asperus 
 
 Lettuce,  food  plant  of  Heliothrips  fasciatus 24 
 
52  NORTH   AMERICAN   THYSANOPTERA. 
 
 Lilac,  California.     (See  Ceanothus  thyrsifiorus.)  Page, 
 mountain.     (See  Ceanothus  sp.) 
 wild.     (See  CeanotAi^  sp.?) 
 
 LiUaceae,  food  plants  of  Reliothrips  hsemorrhoidalis 23 
 
 Limothrips 11,  25 
 
 avenx=Limothrips  cerealium 25 
 
 cereaUum 25 
 
 Liothrips 13,  20,  33 
 
 bakeri 20,  33 
 
 citricornis 20,  33 
 
 fasciculatus 20,  33 
 
 stenoceps 20,  33 
 
 taken  with  Liothrips  fasciculatus  on  wild  buck- 
 wheat    33 
 
 mcconnelli 20,  33 
 
 ocellatus 20,  33 
 
 umbripennis 20,  33 
 
 mexicanus 20,  33 
 
 Lissothrips = 12,  30 
 
 muscorum 30 
 
 Lupine,  purple.     (See  Lupinus  sp.?) 
 
 Lupinus,  food  plant  of  Euthrips  insularis 27 
 
 sp.?,  food  plant  of  jEolothrips  kuiuanaii 22 
 
 Madrona.     (See  Arbutus  menziesii.) 
 
 Malacothrips 13,  31 
 
 zonatus 31 
 
 Malpighiceae,  food  plants  of  Hcterothrips  decacomis 29 
 
 Mango,  food  plant  of  Heliothrips  hxmorrhoidalis 23 
 
 Manzanita.     (See  Manzanita  manzanita .) 
 
 Manzanita  manzanita,  food  plant  of  Orothrips  kelloggii 21 
 
 Maple,  hard.     (See  Acer  saccharum.) 
 
 soft,  food  plant  of  Trichothrips  bujfx 30 
 
 Megalothrips - 13,  21, 34 
 
 hesperus 21,  34 
 
 spinosus 21,  34 
 
 Milium  effusum,  food  plant  of  Baliothrips  basalts 22 
 
 Mimulus  sp. ,  food  plant  of  Thrips  magnus 23,  36 
 
 Mina  lobata,  food  plant  of  Ueliothrips  femoralis 23 
 
 Monkey  flower.     (See  Diplacus  glutinosus  and  Mimulus  sp.) 
 
 Moonflower,  food  plant  of  Ueliothrips  femoralis 23 
 
 Moss,  food  plant  of  Lissothrips  muscorum 30 
 
 Liothrips  ocellatus  taken  thereon 33 
 
 Mullein,  food  plant  of  Anthothrips  verbasci 29 
 
 wild,  food  plant  of  Trichothrips  femoralis 30 
 
 Mustard,  wild,  food  plant  of  Cephalothrips  errans 31,  44 
 
 Neothrips 13,  32 
 
 cortiris 32 
 
 Nicotiana  tabacum  (see  also  T(jbacco). 
 
 food  plant  of  Chirothrips  mexicanus 25 
 
 Nightshade,  food  plant  of  PJuthrips  citri 26 
 
 Oak  leav(\'^,  fallen,  Idolothrips  flavipes  taken  therein 33 
 
 Liothrips  umbripennis  mexicanus  taken  in  galls 33 
 
 taken  on  various  species 33 
 
 scrub,     {^ee  Quercus  dumosa.) 
 tanbark.     (See  Qucrcus  dcnsiflora.) 
 
INDEX.  53 
 
 Oak,  white.     (See  also  Quercus  alba.)  Page. 
 
 Idolothrips  tuhcrculatus  takcMi  IhercMHi 34 
 
 Oats,  food  plant  of  Molothrips  fasciaius 22 
 
 Limolhrips  cerealium 25 
 
 Olive,  food  plant  of  Enjlhrothrips  arizonx 21,  36 
 
 Onion,  food  plant  of  JEolothrips  fasciatus 22 
 
 Orange,  food  plant  of  Anapholhrips  tricolor 28 
 
 zex 28 
 
 Enjthrothrips  arizonx 21,  35 
 
 Euthrips  citri 26 
 
 Ileliothrips  fasciatus 24 
 
 Orchids,  food  plants  of  Euthrips  orchidii 26 
 
 Orothrips 11,21 
 
 kelloggii 13,  21 
 
 yosemitii 13,  21,  34 
 
 Palm,  date,  food  plant  of  Heliothrips  hxmorrhoidalis 23 
 
 kola,  food  plant  of  Heliothrips  hxmorrhoidalis 23 
 
 sago.     (See  Cycas  revoluta.) 
 
 Palms,  food  plants  of  Euthrips  orchidii 26 
 
 Pandanus  sp.,  food  plant  of  Ileliothrips  femoralis 23 
 
 Panicum  capillare,  food  plant  of  Chirothrips  crassu^ 25 
 
 sanguinale,  food  plant  of  jEolothrips  bicolor 21 
 
 Papaw,  food  plant  of  Euthrips  insularis 27 
 
 Parthenothrips 11,  22 
 
 dracxnx 22 
 
 Pea,  food  plant  of  Ileliothrips  fasciatus 24 
 
 Peach,  food  plant  of  Cryptothrips  cali/ornicus 32 
 
 Euthrips  albus 26 
 
 pyri 26 
 
 tree,  dead,  Cryptothrips  rectangularis  taken  under  bark 32 
 
 Pear,  Bartlett,  food  plant  of  Cryptothrips  cali/ornicus 32 
 
 food  plant  of  Euthrips  minutus 27 
 
 pyri 26 
 
 Heliothrips  fasciatus 24 
 
 Pellea  hastata,  food  plant  of  Heliothrips  hxmorrhoidalis 23 
 
 Pepper,  food  plant  of  Euthrips  insularis 27 
 
 Phleum  pratense,  food  plant  of  Anaphothrips  striatus 28 
 
 Phlqeothripid.e 11, 12, 13 
 
 Phloeothrips 13,  20,  32-33 
 
 maculatus 20,  33 
 
 pergandei 20,  32 
 
 raptor 20,  33 
 
 uzeli 20,  32 
 
 Phlox,  food  plant  of  Heliothrips  hxmorrhoidalis 23 
 
 Phyllothrips  asperus=Leptothrips  asperus 32 
 
 citricornis=Liothrips  citricornis 33 
 
 fasciculata=Liothripsfasciculatus 33 
 
 umbripennis—Liothrips  umbripennis 33 
 
 Pine  (see  also  Pinus). 
 
 food  plant  of  Cephalothrips  errans 31 
 
 Pinks,  food  plant  of  Heliothrips  hxmorrhoidalis 23 
 
 Pinus  {see  also  Pine) . 
 
 inops,  Idolothrips  coniferarum  taken  thereon 34 
 
 Plantago  rugelii,  Idolothrips  armatus  taken  thereon 34 
 
54  NORTH  AMERICAN   THYSANOPTERA. 
 
 rage. 
 
 Plectothrips 12,  31 
 
 antennatus 31 
 
 Plum,  food  plant  of  Euthrips  pyri 26 
 
 wild,  in  England,  food  plant  of  Euthrips  pyri 26 
 
 Poa  pratensis,  food  plant  of  Anaphothrips  striatus 28 
 
 Chirothrips  obesus 25 
 
 Poplar,  Carolina,  Acanthothrips  albivittatus  taken  thereon 31 
 
 Phloeothrips  maculatus  taken  under  rotting  bark 33 
 
 Potato,  food  plant  of  Euthrips  insularis 27 
 
 Prune,  food  plant  of  Cephalothrips  errans 44 
 
 Euthrips  ehrhornii 26 
 
 minutus 27 
 
 pyri 26 
 
 Liothrips  mcconnelli » 33 
 
 French,  food  plant  of  Cryptothrips  californicus 32 
 
 Pseudothrips 12,  28 
 
 inequalis 28 
 
 Ptelea  trifoliata,  food  plant  of  Sericothrips  pulchellus 24 
 
 Pyrol,  woolly,  food  plant  of  Euthrips  insularis 27 
 
 Quercus  (see  also  Oak). 
 
 alba,  food  plant  of  Trichothrips  tridentatus 31 
 
 densiflora,  food  plant  of  Cryptothrips  californicus 32 
 
 dumosa,  food  plant  of  Trichothrips  ilex  dumosa 31 
 
 Quince,  food  plant  of  Trichothrips  beachi 30 
 
 Radish,  food  plant  of  Heliothrips  fasciatus 24 
 
 Raphidothrips 11,  25 
 
 fuscipennis 25 
 
 Rhamnus  purshiana,  food  plant  of  Erythrothrips  arizonse 21,  36 
 
 sp. ,  food  plant  of  Euthrips  insularis 27 
 
 Rhaptothrips 12,  29 
 
 peculiaris 29 
 
 Rhododendron  occidentale,  food  plant  of  Thrips  madronii 22 
 
 Richardia  aethiopica,  food  plant  of  Heliothrips  femoralis 23 
 
 Rosacea?,  food  plants  of  Euthrips  cephalicus  reticulatus 27 
 
 Rose,  "La  France, "  food  plant  of  Aleurodothrips  fascia pennis 29 
 
 Roses,  food  plants  of  Euthrips  insularis 27 
 
 Salix  {see  also  Willow). 
 
 fluviatilis,  food  plant  of  Ileterothrips  salicis 28 
 
 Trichothrips  brevicuralis 30 
 
 Sambucus  glauca,  food  plant  of  yEolothrips  kuwanaii 22 
 
 Sabisetia  oleae,  Cryptothrips  californicus  taken  from  under  old  shells 32 
 
 Scale,  black.     (See  Saissetia  olcx.) 
 
 brown  apricot.     (See  Lecanium  corni  [armcniactan].) 
 
 Scirtothrips 12,  26 
 
 Tuihvcrii 26 
 
 >Scololhrips 12,  26 
 
 sexmaculatus 26 
 
 Sericothrips H,  14-15,  24-25 
 
 aptcris 15,  24 
 
 cirujulatus 14,  24 
 
 pulchellus 14,  24 
 
 reticulatus 11, 15,  25 
 
 stanfordii 15,  25 
 
 variabilis 14,  24 
 
INDEX.  56 
 
 Smartweed,  food  plant  of  Sericothrips  variabilis 24 
 
 Solarium  sp.,  food  plant  of  Eulhrips  cephalirus 27 
 
 Thrips  abdominalis 23 
 
 umbelliferum,  food  plant  of  Thrips  madronii 22 
 
 Solidago  {see  also  Goldenrod). 
 
 canadensis,  Idolothrips  armatus  taken  in  galla M 
 
 Zygothrips  longiccps  taken  in  gall 32 
 
 Sunflower,  food  plant  of  Eulhrips  minutus 27 
 
 wild,  food  plant  of  Eulhrips  hclianthi 27,  40 
 
 Sycamore,  Acanlholhrips  nodicornis  taken  thereon 31 
 
 food  plant  of  Acanlholhrips  magnafemoralis 31 
 
 Tansy,  food  plant  of  JEololhrips  fascialus 22 
 
 Terebrantia 10 
 
 Thistle,  food  plant  of  Eulhrips  cilri .^ 26 
 
 THRIPID.E *. ...* 10, 11-12 
 
 Thrips 11, 14,  22-23 
 
 abdominalis 14,  23 
 
 bean.     (See  Heliothrips  fascialus .) 
 
 bremnerii 14,  23 
 
 grass.     (See  Anapholhrips  striatum.) 
 greenhouse.     (See  Heliothrips  hxmorrhoidalis .) 
 
 madronii 14,  22 
 
 magnus 14,  23,  36 
 
 onion.     (See  Thrips  labaci.) 
 orange.     (See  Eulhrips  cilri.) 
 pear.     (See  Eulhrips  pyri.) 
 
 perplexus 14,  23 
 
 strawberry.     (See  Eulhrips  Irilici.) 
 
 labaci 9, 14,  23 
 
 tobacco.     (See  Eulhrips  fuscus .) 
 
 Thysanoptera,  North  American,  bibliography  of  recent  papers 44-46 
 
 catalogue 21-34 
 
 classification 10-21 
 
 key  to  genera 11-13 
 
 species 13-21 
 
 suborders  and  families 10-11 
 
 Tobacco  (see  also  Nicotiana  tabacum). 
 
 food  plant  of  Eulhrips  fuscus 27 
 
 insularis 27 
 
 Tomato,  food  plant  of  Heliothrips  femoralis 23 
 
 Trichothrips .-•-,: 12, 17-19,  30-31 
 
 ambitus ---y^/- ,' 18,  30 
 
 americanus l  vi : 18,  30 
 
 angusticeps '•  W^^. 18,  30 
 
 beachi 18,  30 
 
 brevicuralis 18,  30 
 
 buffx 18,  30 
 
 dens 18,  30 
 
 femoralis 18,  30 
 
 ilex 18,  30 
 
 dumosa 19,  31 
 
 longitubus 18,  30 
 
 ruber 18,  30,  42-43 
 
 smithi 18,  30 
 
 tridentatus 19,  31 
 
56 
 
 NORTH   AMERICAN   THYSANOPTERA. 
 
 TUBULIFERA 
 
 JJlnius  montana  var.  pendula,  food  plant  of  Phlceothrips  uzeli 
 
 Umhellularia  califomica,  food  pknt  of  Ankothrips  robustus 
 
 Thrips  madronii 
 
 Verbenas,  food  plants  of  Heliothrips  haemorrhoidalis 
 
 Vetch,  wild,  food  plant  of  Heliothrips  hxmorrhoidalis 
 
 Vines,  pea,  food  plant  of  Heliothrips  fasciatus 
 
 food  plants  of  Heliothrips  hxmorrhoidalis 
 
 Vitis  {see  also  Grape). 
 
 spp.,  food  plants  of  Heliothrips  femor alls 
 
 Walnut,  English,  food  plant  of  Eathrips  pyri , 
 
 Weeds,  food  plants  of  jEolothrips  fasciatus • 
 
 Sericothrjps  aptens 
 
 «      .  ^.    .  ^  r.eticulatus  -...:.:. 
 
 ^<«'*'  •  ■  *'  stanfordii 
 
 Wheat,  food  plant  of  ^olothrips  fasciatus 
 
 White  fly,  citrus.     (See  Aleyrodes  citri.) 
 
 wood,  food  plant  of  Euthrips  insularis 
 
 Willow  (see  also  Salix  Jluviatilis). 
 
 black,  food  plant  of  Euthrips  insularis 
 
 stem,  dead,  Cryptothrips  rectangularis  taken  in  lepidopterous  or  coleop- 
 terous larval  burrows 
 
 Megalothrips  (?)  spinosus  taken  in  lepidopterous  or  coleop- 
 terous larval  burrows 
 
 Yams,  food  plant  of  Euthrips  insularis 
 
 Yarrow,  food  plant  of  Euthrips  minutus 
 
 Yucca  filamentosa,  food  plant  of  Cephalothrips  yuccx 
 
 Zygothrips 
 
 longiceps 
 
 raire. 
 11 
 B2 
 21 
 22 
 23 
 24 
 24 
 23 
 
 23 
 26 
 22 
 24 
 25 
 25 
 22 
 
 27 
 
 27 
 
 32 
 
 34 
 27 
 27 
 31 
 13,32 
 32 
 
 O 
 
 11 
 
 UNIVERSITY  OF  FLORIDA 
 
 illlilllli 
 
 3  1262  09229  6440 
 
 ^^it'^^y 
 
 '^^ 
 
 ^cHi^