﻿12 
  

  

  THE 
  BEAN 
  THRIPS. 
  

  

  THE 
  YOUNG 
  NYMPH 
  OR 
  PREPUPA. 
  

  

  (Fig. 
  6.) 
  

  

  Length, 
  1.02 
  mm. 
  ; 
  width 
  of 
  mesothorax, 
  0.255 
  mm. 
  Shape 
  fusiform, 
  similar 
  

   to 
  adult. 
  Head, 
  length, 
  0.09 
  mm. 
  ; 
  width 
  at 
  eyes, 
  0.157 
  mm. 
  Head 
  translucent 
  

   white, 
  vertex 
  slightly 
  yellowish, 
  ocelli 
  absent. 
  Head 
  rounded 
  in 
  front, 
  slightly 
  

   notched 
  behind 
  the 
  eyes 
  ; 
  eyes 
  red, 
  made 
  up 
  of 
  a 
  few 
  facets, 
  surface 
  faintly 
  

   reticulated 
  ; 
  two 
  pairs 
  of 
  setae 
  behind 
  the 
  eyes 
  and 
  two 
  pairs 
  between 
  the 
  eyes. 
  

   Antennae 
  translucent 
  white, 
  extending 
  forward, 
  0.195 
  mm. 
  in 
  length; 
  segments 
  

   indistinct 
  but 
  apparently 
  7-segmented. 
  

  

  Prothorax 
  about 
  one-half 
  again 
  as 
  wide 
  as 
  long, 
  sides 
  rounded, 
  posterior 
  edge 
  

   broadest, 
  semitranslucent 
  white 
  to 
  yellow, 
  posterior 
  angles 
  tinted 
  with 
  crimson. 
  

  

  Fig. 
  5. 
  — 
  The 
  bean 
  thrips 
  : 
  Second- 
  

   stage 
  larva. 
  Greatly 
  enlarged. 
  

   (Original.) 
  

  

  Fig. 
  6. 
  — 
  The 
  bean 
  thrips: 
  Prepupa. 
  

   Greatly 
  enlarged. 
  (Original.) 
  

  

  setae 
  around 
  margin. 
  Mesothorax 
  with 
  rounded 
  angles, 
  translucent 
  white 
  to 
  

   faint 
  yellow, 
  sides 
  and 
  posterior 
  angles 
  tinted 
  with 
  crimson, 
  wing-cases 
  trans- 
  

   parent 
  white, 
  distinct 
  from 
  each 
  other, 
  those 
  of 
  forewings 
  extending 
  to 
  middle 
  

   of 
  second 
  abdominal 
  segment 
  and 
  those 
  of 
  hind 
  wings 
  extending 
  to 
  middle 
  of 
  

   third 
  abdominal 
  segment. 
  Legs 
  strong, 
  translucent 
  white. 
  

  

  Abdomen 
  fusiform 
  as 
  in 
  adult, 
  translucent 
  white 
  to 
  faint 
  yellowish, 
  edges 
  

   with 
  tint 
  of 
  crimson, 
  which 
  enlarges 
  to 
  fair-sized 
  blotches 
  on 
  sides 
  of 
  seventh 
  

   and 
  eighth 
  segments; 
  number 
  of 
  longitudinal 
  rows 
  of 
  setae 
  increasing 
  in 
  length 
  

   toward 
  posterior 
  end. 
  Length 
  of 
  abdomen, 
  0.62 
  mm. 
  

  

  