﻿AN 
  INTERNAL 
  PARASITE 
  OF 
  A 
  THRIPS 
  FROM 
  TRINIDAD. 
  455 
  

  

  Metanotum 
  and 
  propodeon 
  (fig. 
  2, 
  c) 
  : 
  the 
  latter 
  entirely 
  smooth 
  and 
  without 
  a 
  median 
  

   keel 
  ; 
  on 
  each 
  side 
  postero-laterally 
  a 
  short, 
  hollow, 
  projecting 
  knob, 
  connected 
  by 
  a 
  

   ridge 
  with 
  the 
  posterior 
  edge. 
  Sternopleurae 
  smooth 
  and 
  bare 
  — 
  one 
  bristle 
  at 
  each 
  

   postero-lateral 
  angle 
  of 
  the 
  sternum. 
  Ridge 
  between 
  sternum 
  and 
  episternite 
  

   indicated 
  clearly 
  on 
  posterior 
  half. 
  Prepectus 
  with 
  a 
  pattern 
  like 
  that 
  of 
  the 
  

   pronotum 
  but 
  a 
  little 
  drawn 
  out 
  ; 
  bare 
  save 
  for 
  the 
  minute 
  marginal 
  bristles. 
  

  

  Wings. 
  Fore-wings 
  (fig. 
  \,d) 
  15 
  : 
  7 
  ; 
  length 
  0-8 
  mm. 
  ; 
  two 
  bristles 
  and 
  one 
  clear 
  

   pustule 
  on 
  the 
  submarginal 
  vein 
  ; 
  base 
  of 
  the 
  marginal 
  vein 
  swollen 
  Hind-wings, 
  

   25 
  : 
  4, 
  length 
  • 
  7 
  mm. 
  

  

  Legs. 
  Fore-legs 
  : 
  coxae 
  11:6, 
  surface 
  pattern 
  very 
  coarse, 
  three 
  apical 
  bristles 
  

   posteriorly, 
  in 
  transverse 
  row, 
  5-7 
  anteriorly 
  ; 
  femur 
  (4 
  : 
  1) 
  shorter 
  (10 
  : 
  11) 
  than 
  

   tibia 
  (15 
  : 
  2) 
  ; 
  on 
  femur 
  posteriorly 
  in 
  median 
  row 
  five 
  bristles, 
  three 
  bristles 
  widely 
  

   spaced 
  on 
  ventral 
  edge 
  before 
  one-half, 
  one 
  subapical 
  ventral 
  spinose 
  bristle. 
  

   Anteriorly 
  about 
  seven 
  bristles 
  in 
  subdorsal 
  row, 
  and 
  subapical 
  spinose 
  bristle 
  ; 
  

   1st 
  tarsal 
  comb 
  with 
  4-5 
  spines 
  ; 
  tarsus 
  15 
  : 
  17 
  : 
  17 
  : 
  25. 
  Mid-legs 
  : 
  coxae 
  smooth 
  ; 
  

   femur 
  (5 
  : 
  1) 
  much 
  shorter 
  (3 
  : 
  4) 
  than 
  the 
  tibia 
  (12 
  : 
  1) 
  ; 
  tarsus 
  17 
  : 
  17 
  : 
  17 
  : 
  25. 
  

   Hind 
  -legs 
  : 
  coxae 
  (7 
  : 
  4) 
  smooth, 
  over 
  half 
  (4 
  : 
  7) 
  the 
  femur 
  (4:1); 
  the 
  latter 
  shorter 
  

   (9 
  : 
  10) 
  than 
  the 
  tibia 
  (8 
  : 
  1), 
  apical 
  comb 
  with 
  six 
  spines 
  ; 
  tarsus 
  as 
  in 
  mid-legs. 
  

  

  Abdomen 
  about 
  one-third 
  longer 
  than 
  the 
  thorax 
  and 
  propodeon, 
  or 
  equal 
  to 
  the 
  

   head, 
  thorax 
  and 
  propodeon. 
  About 
  six-sevenths 
  the 
  breadth 
  of 
  the 
  head 
  or 
  three- 
  

   quarters 
  that 
  of 
  the 
  thorax 
  on 
  the 
  2nd 
  (4th) 
  segment 
  or 
  five-sixths 
  on 
  the 
  4th, 
  i.e., 
  

   little 
  expanded 
  and 
  not 
  flattened 
  but 
  rather 
  swollen 
  and 
  decurved 
  posteriorly. 
  

   Ovipositor 
  short, 
  about 
  one-third 
  the 
  length 
  of 
  the 
  abdomen 
  ; 
  the 
  1st 
  segment 
  

   is 
  longest 
  but 
  less 
  than 
  one-third 
  of 
  the 
  whole 
  measured 
  from 
  the 
  insertion 
  of 
  

   the 
  petiole 
  to 
  the 
  ovipositor 
  tip. 
  Measured 
  along 
  the 
  mid 
  line 
  the 
  tergites 
  are 
  

   approximately! 
  (iii), 
  15 
  ; 
  ii 
  (iv), 
  11 
  ; 
  iii 
  (v), 
  10 
  ; 
  iv 
  (vi), 
  3 
  ; 
  v 
  (vii), 
  3. 
  The 
  sternites 
  

   are 
  similarly 
  unusually 
  reduced 
  posteriorly, 
  the 
  last 
  being 
  not 
  quite 
  two-thirds 
  the 
  

   first. 
  Integument 
  generally 
  quite 
  smooth 
  but 
  with 
  indications 
  of 
  a 
  pattern 
  antero- 
  

   lateral^ 
  on 
  tergite 
  i 
  (iii). 
  Chaetotaxy 
  : 
  petiole 
  with 
  two 
  pleural 
  bristles 
  ; 
  on 
  each 
  

   side 
  tergites 
  i 
  and 
  ii 
  bear 
  ten 
  to 
  twelve 
  bristles, 
  iii 
  and 
  iv 
  twelve 
  to 
  thirteen, 
  v 
  six 
  to 
  

   seven, 
  vi 
  five 
  and 
  one 
  at 
  the 
  spiracle 
  ; 
  the 
  stylet 
  or 
  process 
  on 
  vii 
  bears 
  one 
  short 
  

   and 
  three 
  long 
  bristles 
  ; 
  between 
  the 
  stylets 
  are 
  four 
  bristles 
  and 
  three 
  beyond 
  each 
  

   of 
  the 
  processes 
  ; 
  the 
  detached 
  sclerite 
  "(part 
  of 
  vii) 
  below 
  bears 
  one 
  minute 
  bristle 
  ; 
  

   sternite 
  i 
  bare, 
  ii 
  with 
  two 
  bristles, 
  iii-v 
  with 
  four. 
  

  

  Length 
  about 
  1-4 
  mm. 
  ; 
  alar 
  expanse, 
  1-9 
  mm. 
  to 
  2 
  mm. 
  

  

  Type 
  $ 
  in 
  the 
  British 
  Museum, 
  one 
  of 
  a 
  small 
  series 
  of 
  $$ 
  bred 
  from 
  a 
  thrips 
  

   (prepupal 
  stage) 
  attacking 
  Clydemia 
  sp. 
  

  

  Trinidad 
  : 
  British 
  West 
  Indies, 
  summer 
  1922 
  (F. 
  W. 
  Urich). 
  

  

  So 
  far 
  as 
  I 
  can 
  judge, 
  T. 
  thripophonus, 
  sp. 
  n., 
  is 
  not 
  nearly 
  related 
  to 
  any 
  of 
  the 
  

   Tetrastichus 
  spp. 
  described 
  from 
  St. 
  Vincent 
  and 
  Grenada 
  by 
  Ashmead. 
  It 
  may, 
  

   however, 
  have 
  close 
  affinities 
  with 
  T. 
  gentilii, 
  Del 
  Guercio 
  (Atti 
  dei 
  Georgofili 
  di 
  

   Firenze 
  (5), 
  viii, 
  pp. 
  222-227, 
  September 
  1911), 
  of 
  which 
  I 
  have 
  tried 
  to 
  procure 
  a 
  

   specimen 
  for 
  comparison, 
  but 
  without 
  result. 
  

  

  