﻿SEASONAL 
  HISTORY 
  AT 
  COMPTON, 
  CAL. 
  

  

  35 
  

  

  Table 
  IX. 
  — 
  Length 
  of 
  prepupal 
  and 
  pupal 
  -stages 
  of 
  the 
  bean 
  thrips 
  at 
  Comp- 
  

   ton, 
  Gal., 
  during 
  July, 
  Jill 
  I. 
  

  

  Exp. 
  

   No. 
  

  

  Changed 
  to 
  prepupa. 
  

  

  Date. 
  

  

  Julyl. 
  

   [July 
  10 
  

   'july 
  11 
  

  

  [july 
  13 
  

  

  fJuly 
  15 
  

   [July 
  16 
  

   (July 
  19 
  

   lJuly 
  20 
  

  

  Num- 
  

   ber. 
  

  

  Changed 
  to 
  

   pupa. 
  

  

  Date. 
  

  

  July 
  5 
  

  

  July 
  13 
  

  

  /July 
  14 
  

  

  \July 
  15 
  

  

  jJuly 
  14 
  

  

  \July 
  15 
  

  

  July 
  17 
  

  

  July 
  18 
  

  

  July 
  23 
  

  

  July 
  24 
  

  

  Num- 
  

   ber. 
  

  

  Adults 
  

   emerged. 
  

  

  Date. 
  

  

  /July 
  11 
  

  

  \Julv 
  12 
  

  

  July 
  18 
  

  

  Jjuly 
  IS 
  

  

  Wy 
  19 
  

  

  July 
  24 
  

  

  July 
  24 
  

  

  July 
  29 
  

  

  July 
  29 
  

  

  Num- 
  

   ber. 
  

  

  Length 
  of 
  stage. 
  

  

  Pre- 
  

   pupal. 
  

  

  Days. 
  

   4 
  

   3 
  

   3 
  

  

  1-2 
  

  

  2 
  

   2 
  

   3 
  

   3 
  

  

  Pupal. 
  

  

  Days. 
  

   6-7 
  

  

  Total. 
  

  

  Days. 
  

   10-11 
  

  

  8 
  

  

  7 
  

  

  5-7 
  

  

  Average 
  

   mean 
  

  

  tempera- 
  

   ture. 
  

  

  °F. 
  

  

  71.7 
  

   70. 
  1 
  

  

  71.6 
  

  

  68.5 
  

  

  During 
  the 
  month 
  of 
  August, 
  1910, 
  at 
  Los 
  Angeles, 
  Cal., 
  larvae 
  

   changed 
  to 
  prepupaj 
  August 
  2 
  and 
  the 
  adults 
  emerged 
  on 
  August 
  9, 
  

   requiring 
  7 
  days 
  for 
  the 
  prepupal 
  and 
  pupal 
  stages. 
  For 
  this 
  period 
  

   the 
  average 
  mean 
  temperature 
  at 
  Compton, 
  10 
  miles 
  out, 
  was 
  72.4° 
  F. 
  

   Another 
  lot 
  changed 
  to 
  prepupye 
  on 
  August 
  7 
  and 
  the 
  adults 
  emerged 
  

   on 
  August 
  15, 
  giving 
  a 
  total 
  of 
  8 
  days 
  for 
  the 
  prepupal 
  and 
  pupal 
  

   stages. 
  The 
  average 
  mean 
  temperature 
  at 
  Compton 
  for 
  the 
  period 
  

   was 
  71.4° 
  F. 
  

  

  For 
  the 
  latter 
  part 
  of 
  August 
  and 
  for 
  September 
  the 
  length 
  of 
  these 
  

   stages 
  is 
  nearly 
  that 
  required 
  in 
  July. 
  However, 
  in 
  October 
  this 
  

   time 
  is 
  lengthened 
  to 
  some 
  extent, 
  Larvae 
  that 
  changed 
  to 
  prepupa) 
  

   on 
  November 
  3, 
  1910, 
  required 
  until 
  November 
  1G 
  before 
  the 
  adults 
  

   emerged, 
  or 
  a 
  total 
  of 
  13 
  days. 
  The 
  average 
  mean 
  temperature 
  for 
  

   the 
  period 
  was 
  59.9° 
  F. 
  

  

  Records 
  made 
  of 
  the 
  length 
  of 
  the 
  prepupal 
  and 
  pupal 
  stages 
  for 
  

   November 
  and 
  December, 
  1910, 
  as 
  given 
  in 
  Table 
  X, 
  show 
  that 
  at 
  

   that 
  time 
  of 
  year 
  the 
  period 
  required 
  was 
  greatly 
  prolonged, 
  the 
  

   prepupal 
  stage 
  requiring 
  from 
  7 
  to 
  9 
  days 
  and 
  the 
  pupal 
  stage 
  from 
  

   20 
  to 
  24 
  days, 
  making 
  a 
  total 
  period 
  of 
  from 
  27 
  to 
  33 
  days. 
  During 
  

   this 
  period 
  the 
  mean 
  average 
  temperature 
  was 
  53.58° 
  F. 
  

  

  Table 
  x. 
  -Length 
  of 
  prepupal 
  and 
  pupal 
  stages 
  of 
  the 
  bean 
  thrips 
  for 
  November, 
  

  

  1910, 
  at 
  Compton. 
  Cat. 
  

  

  Exp. 
  

  

  No. 
  

  

  Changed 
  to 
  prepnp:i. 
  

  

  Changed 
  to 
  pupa. 
  

  

  Adults 
  emi 
  

  

  Length 
  of 
  stage. 
  

  

  Date. 
  

  

  Number. 
  

  

  Date. 
  

  

  Number. 
  

  

  Date. 
  

  

  Number. 
  

  

  Pre- 
  

   pupal. 
  

  

  Pupal. 
  

  

  Total. 
  

  

  1 
  

  

  Nov. 
  M 
  

  

  l 
  

   2 
  

  

  7 
  

  

  Nov. 
  21 
  

  

  [Nov. 
  25 
  

   Nov. 
  26 
  

  

  l 
  

   2 
  

  

  9 
  

  

  Dec. 
  L2 
  

  

  ll'rr. 
  13 
  

  

  (Deo. 
  r. 
  

   Deo. 
  Lfi 
  

  

  D«J. 
  17 
  

  

  1 
  

  

  i 
  

   l 
  

  

  i 
  

   3 
  

  

  Days. 
  

  

  ! 
  ; 
  

  

  ! 
  B-d 
  

  

  Days. 
  

   21 
  

  

  22 
  24 
  

  

  Days. 
  

  

  2 
  

  

  3 
  

  

  Nov. 
  16 
  

  

  Not 
  . 
  17 
  

  

  30 
  88 
  

  

  

  Total. 
  . 
  . 
  

  

  

  1 
  or 
  27. 
  

  

  1 
  

  

  

  

  10 
  

  

  

  

  

  

  

  

  

  