﻿33 
  

  

  Table 
  V. 
  — 
  Length 
  of 
  larval 
  stage 
  of 
  the 
  bean 
  thrips, 
  Compton, 
  Cal., 
  March 
  and 
  

  

  May, 
  1911. 
  

  

  Date 
  larvae 
  hatched. 
  

  

  Number 
  

  

  Larvse 
  pupating. 
  

  

  

  Length 
  stage. 
  

  

  Average 
  

  

  of 
  larvae 
  

  

  hatched. 
  

  

  

  

  

  

  Date. 
  

  

  Number. 
  

  

  Minimum. 
  

  

  Maximum. 
  

  

  tempera- 
  

   ture. 
  

  

  

  

  

  

  Days. 
  

  

  Days. 
  

  

  °F. 
  

  

  

  fApr. 
  5 
  

  

  1 
  

  

  1 
  

  

  

  

  

  8 
  

  

  {Apr. 
  6 
  

  

  2 
  

  

  

  17 
  

  

  19 
  

  

  61.5 
  

  

  7 
  

  

  lApr. 
  7 
  

   May 
  24 
  

  

  i 
  1 
  

   1 
  

  

  1 
  

  

  10 
  

  

  } 
  « 
  

  

  

  15 
  

  

  /May 
  26 
  

   \May 
  27 
  

  

  4 
  

   1 
  

  

  } 
  

  

  10 
  

  

  62.1 
  

  

  14 
  

  

  May 
  27 
  

  

  4 
  

  

  

  9 
  

  

  11 
  

  

  62.1 
  

  

  Mar. 
  19. 
  

  

  May 
  14. 
  

   May 
  16. 
  

   May 
  18. 
  

  

  1 
  Rest 
  killed 
  by 
  heat. 
  

  

  During 
  June 
  and 
  the 
  first 
  part 
  of 
  July 
  this 
  method 
  of 
  rearing 
  

   larva) 
  to 
  secure 
  the 
  length 
  of 
  instars 
  was 
  repeated, 
  with 
  the 
  results 
  

   shown 
  in 
  Table 
  VI. 
  

  

  Table 
  VI. 
  — 
  Length 
  of 
  larval 
  stage 
  of 
  the 
  bean 
  thrips 
  in 
  June 
  and 
  the 
  first 
  part 
  

   of 
  July, 
  1911, 
  Compton, 
  Cal. 
  

  

  Exp. 
  

  

  Eggs 
  hatched. 
  

  

  Larvae 
  pupated. 
  

  

  1 
  Total 
  

  

  Duration 
  of 
  stage. 
  

  

  Average 
  

   mean 
  

  

  No. 
  

  

  Date. 
  

  

  Number. 
  

  

  Date. 
  

  

  pupated. 
  

   Number. 
  

  

  Minimum. 
  

  

  Maximum. 
  

  

  tempera- 
  

   ture. 
  

  

  1 
  

  

  

  5 
  

  

  50 
  

  

  50 
  

   50 
  

  

  /June 
  28 
  

   Uuly 
  1 
  

   (July 
  10 
  

   Uuly 
  11 
  

   [July 
  12 
  

   /July 
  11 
  

   \July 
  12 
  

   July 
  13 
  

  

  1 
  

   1} 
  ■ 
  

  

  !| 
  u 
  

  

  1} 
  » 
  

  

  3 
  3 
  

  

  Days. 
  

   13 
  

  

  11 
  

  

  11 
  

   12 
  

  

  Days. 
  

   16 
  

  

  13 
  

  

  12 
  

  

  •F. 
  

   63.9 
  

  

  

  f 
  June 
  29 
  

  

  

  2 
  

  

  I 
  June 
  29 
  . 
  . 
  . 
  

  

  I 
  66.7 
  

  

  

  (July 
  1 
  

  

  

  

  

  

  Here 
  the 
  minimum 
  for 
  the 
  larval 
  stage 
  was 
  11 
  days 
  and 
  the 
  maxi- 
  

   mum 
  14 
  days. 
  

  

  In 
  July 
  larvae 
  were 
  reared 
  from 
  eggs 
  laid 
  in 
  normal 
  growing 
  

   plants, 
  situated 
  in 
  an 
  outdoor 
  insectary 
  under 
  normal 
  conditions. 
  

   These 
  experiments 
  are 
  all 
  given 
  in 
  Table 
  VII. 
  

  

  Table 
  VII. 
  — 
  Length 
  of 
  larval 
  stage 
  of 
  the 
  bean 
  thrips 
  in 
  July, 
  1911, 
  at 
  Compton, 
  

  

  Cal. 
  

  

  Exp. 
  

  

  Eggs 
  hatched. 
  

  

  Date 
  and 
  number 
  of 
  larvae 
  

   pupating. 
  

  

  Total 
  

   larvae 
  

   pupat- 
  

   ing. 
  

  

  Length 
  of 
  larval 
  stage. 
  

  

  Average 
  

   mean 
  

  

  No. 
  

  

  Date. 
  

  

  Number. 
  

  

  Minimum. 
  

  

  Maximum. 
  

  

  tempera- 
  

   ture. 
  

  

  1 
  

  

  2 
  

  

  (July 
  28 
  

   {July 
  24 
  

  

  |. 
  July 
  26 
  

  

  fjuly 
  24 
  

  

  Uuly 
  25 
  

   1 
  J 
  uly 
  26 
  

  

  /July 
  28 
  

   IJuly 
  29 
  

  

  5 
  

  

  54 
  

   16 
  

  

  26 
  

  

  18 
  

   9 
  

  

  8 
  

   15 
  

  

  July 
  31, 
  85 
  larvae 
  feeding; 
  Aug. 
  

  

  ■ 
  2, 
  all 
  but 
  10 
  left 
  plant 
  i<> 
  pu- 
  

   pate; 
  Aug. 
  5. 
  lo 
  prcpupae. 
  

  

  Auk. 
  2, 
  all 
  larva* 
  left 
  plant 
  to 
  

   pupate 
  in 
  cracks. 
  These 
  lar- 
  

   va- 
  were 
  feeding 
  from 
  7 
  to 
  9 
  

   days 
  and 
  then 
  left 
  the 
  plant. 
  

  

  1 
  - 
  

  

  Days. 
  

   10 
  

  

  Days. 
  

   12 
  

  

  ° 
  F. 
  

   68.8 
  

  

  68.8 
  

  

  

  1 
  

  

  

  

  } 
  65.4 
  

  

  3 
  

  

  Aug. 
  9. 
  number 
  of 
  larva- 
  pu- 
  

   pated. 
  

  

  

  11 
  

  

  

  

  

  

  