﻿HABITS 
  OF 
  THE 
  ADULT. 
  

  

  19 
  

  

  the 
  leaf 
  surface. 
  She 
  then 
  proceeded 
  to 
  work 
  the 
  ovipositor 
  back 
  

   and 
  forth 
  in 
  the 
  rupture 
  until 
  she 
  had 
  made 
  an 
  incision 
  of 
  sufficient 
  

   depth. 
  After 
  this 
  she 
  became 
  motionless 
  for 
  a 
  varying 
  length 
  of 
  

   time, 
  while 
  the 
  egg 
  was 
  being 
  deposited, 
  whereupon 
  the 
  ovipositor 
  

   was 
  removed, 
  and 
  the 
  female 
  moved 
  away. 
  

  

  A 
  number 
  of 
  cases 
  have 
  been 
  observed 
  where 
  the 
  female, 
  after 
  

   inserting 
  the 
  ovipositor, 
  could 
  not 
  withdraw 
  it, 
  and, 
  thus 
  held, 
  she 
  

   soon 
  died. 
  

  

  NUMBER 
  OF 
  EGGS 
  AND 
  PERIOD 
  OF 
  OVIPOSITION. 
  

  

  Owing 
  to 
  the 
  artificial 
  means 
  used 
  in 
  studying 
  the 
  habits 
  of 
  this 
  

   insect 
  it 
  was 
  impossible 
  to 
  determine 
  exactly 
  how 
  many 
  eggs 
  a 
  

   female 
  is 
  capable 
  of 
  laying. 
  However, 
  the 
  writer 
  confined 
  6 
  fe- 
  

   males 
  in 
  a 
  vial 
  for 
  observation. 
  They 
  laid 
  an 
  average 
  of 
  35.5 
  egg* 
  

   each, 
  while 
  the 
  highest 
  average 
  for 
  any 
  day 
  was 
  5.5 
  eggs 
  each. 
  

   Another 
  female, 
  during 
  the 
  period 
  from 
  August 
  16 
  to 
  August 
  23, 
  

   1911, 
  laid 
  1G 
  eggs, 
  the 
  greatest 
  number 
  laid 
  in 
  any 
  one 
  day 
  being 
  5. 
  

   At 
  Compton, 
  Cal., 
  during 
  1911, 
  females 
  kept 
  in 
  confinement 
  were 
  

   observed 
  to 
  oviposit 
  for 
  30 
  days 
  in 
  succession, 
  while 
  others 
  were 
  

   observed 
  to 
  oviposit 
  51 
  and 
  83 
  days 
  after 
  they 
  emerged 
  from 
  the 
  

   pupae. 
  If 
  this 
  insect 
  normally 
  continues 
  oviposition 
  regularly 
  over 
  

   v. 
  period 
  of 
  83 
  days 
  the 
  total 
  number 
  of 
  eggs 
  laid 
  must 
  be 
  very 
  large. 
  

  

  Mr. 
  V. 
  L. 
  Wildermuth, 
  while 
  in 
  the 
  Imperial 
  Valley, 
  made 
  some 
  

   interesting 
  notes 
  on 
  the 
  number 
  of 
  eggs 
  this 
  species 
  may 
  deposit. 
  

   On 
  August 
  2, 
  1910, 
  he 
  confined 
  2 
  females 
  on 
  leaves 
  of 
  alfalfa 
  in 
  

   a 
  vial, 
  and 
  on 
  August 
  5 
  these 
  leaves 
  contained 
  50 
  eggs, 
  or 
  an 
  average 
  

   of 
  25 
  eggs 
  each 
  in 
  3 
  days. 
  His 
  other 
  observations 
  are 
  given 
  in 
  

   Table 
  I. 
  

  

  Table 
  I. 
  — 
  Number 
  of 
  eggs 
  deposited 
  by 
  the 
  bean 
  thrips 
  (Heliothrips 
  fasciatus), 
  

   Imperial 
  Valley, 
  Cal., 
  1910. 
  

  

  Exper- 
  

  

  Date 
  female 
  

   was 
  put 
  in 
  vial. 
  

  

  Date 
  and 
  number 
  of 
  eggs. 
  

  

  Total 
  

   period 
  of 
  

   oviposi- 
  

   tion. 
  

  

  Total 
  

  

  iment 
  

   No. 
  

  

  1910. 
  

  

  1 
  

   Eggs. 
  1910. 
  

  

  Eggs. 
  

  

  1910. 
  

  

  Eggs. 
  

  

  Dead. 
  

  

  number 
  

   of 
  eggs. 
  

  

  1 
  

   2 
  

  

  1910. 
  

  

  Au^. 
  29 
  

  

  Auk- 
  ^1 
  

  

  do 
  

  

  do 
  

  

  1911. 
  

  

  Sept. 
  28 
  i 
  

  

  Sept. 
  1 
  

   Sept. 
  4 
  

   Sept. 
  7 
  

   Sept. 
  1 
  

  

  Sept. 
  30 
  

  

  30 
  

   42 
  

   53 
  

  

  Sept. 
  2 
  

  

  6 
  

  

  Sept. 
  G 
  

  

  37 
  

  

  1 
  

  

  Days. 
  

   7 
  

   3 
  

   (i 
  

   1 
  

  

  40 
  

  

  79 
  

   42 
  

  

  3 
  

  

  

  

  

  

  53 
  

  

  4 
  

  

  20 
  

  

  

  

  

  

  20 
  

  

  5 
  

  

  12 
  

  

  Oct. 
  3 
  

  

  Oct. 
  21 
  

  

  2.") 
  

   47 
  

   27 
  

  

  Oct. 
  11 
  

  

  21 
  

  

  134 
  

  

  

  

  Nov. 
  l 
  

  

  Nov. 
  11 
  

  

  ",' 
  

  

  

  • 
  Record 
  made 
  al 
  Tempe, 
  Ariz.. 
  

  

  Iii 
  these 
  experiments 
  the 
  longest 
  period 
  of 
  oviposition 
  was 
  H> 
  days, 
  

   and 
  the 
  Largest 
  number 
  of 
  eggs 
  laid 
  by 
  a 
  single 
  female, 
  L34. 
  

  

  It 
  will 
  be 
  observed 
  from 
  these 
  figures 
  that 
  the 
  females 
  observed 
  by 
  

   Mr. 
  Wildermuth 
  deposited 
  more 
  eggs 
  and 
  at 
  a 
  more 
  rapid 
  daily 
  rale 
  

  

  