﻿HABITS 
  OF 
  THE 
  ADULT. 
  17 
  

  

  Idaho, 
  who 
  collected 
  it 
  in 
  a 
  diseased 
  spot 
  of 
  a 
  crab 
  apple. 
  On 
  August 
  

   27, 
  1908, 
  Mr. 
  I. 
  J. 
  Condit 
  sent 
  in 
  specimens 
  of 
  this 
  thrips 
  from 
  

   Davis, 
  Cal., 
  where 
  they 
  were 
  injuring 
  sugar 
  beets. 
  He 
  wrote: 
  

  

  I 
  examined 
  the 
  beets 
  and 
  found 
  them 
  literally 
  covered 
  with 
  thrips, 
  both 
  the 
  

   surface 
  and 
  underside 
  of 
  the 
  leaves 
  being 
  badly 
  infested. 
  There 
  were 
  very 
  

   few 
  leaves 
  which 
  were 
  not 
  attacked, 
  most 
  of 
  them 
  having 
  the 
  appearance 
  of 
  

   the 
  specimens 
  sent. 
  A 
  field 
  of 
  tomatoes 
  near 
  by 
  was 
  also 
  becoming 
  infested. 
  

   The 
  lower 
  leaves 
  especially 
  were 
  yellow 
  and 
  some 
  falling 
  off. 
  

  

  Mr. 
  S. 
  W. 
  Foster 
  informed 
  the 
  writer 
  that 
  on 
  August 
  26, 
  1909, 
  

   Mr. 
  Frank 
  T. 
  Swett, 
  of 
  Martinez, 
  Cal., 
  sent 
  to 
  the 
  laboratory 
  of 
  

   the 
  Bureau 
  of 
  Entomology 
  at 
  Walnut 
  Creek, 
  Cal., 
  a 
  quantity 
  of 
  

   pear 
  leaves 
  badly 
  injured 
  by 
  this 
  species. 
  On 
  August 
  31 
  Mr. 
  Foster 
  

   visited 
  the 
  orchard 
  and 
  found 
  the 
  injury 
  quite 
  noticeable. 
  He 
  wrote 
  

   that 
  " 
  the 
  foliage 
  gave 
  the 
  appearance 
  from 
  a 
  distance 
  of 
  having 
  

   been 
  scalded." 
  Mr. 
  V. 
  L. 
  Wildermuth, 
  of 
  this 
  bureau, 
  sent 
  speci- 
  

   mens 
  taken 
  on 
  alfalfa 
  at 
  Indio, 
  Cal., 
  on 
  July 
  2, 
  1910. 
  Mr. 
  A. 
  

   McLachlan, 
  of 
  Davis, 
  Cal., 
  sent 
  in 
  specimens 
  of 
  this 
  thrips 
  on 
  

   October 
  13, 
  1910, 
  with 
  the 
  report 
  that 
  they 
  were 
  injuring 
  the 
  buds 
  

   and 
  tips 
  of 
  cotton. 
  

  

  Mr. 
  W. 
  B. 
  Parker, 
  of 
  this 
  bureau, 
  under 
  date 
  of 
  August 
  25, 
  1911, 
  

   sent 
  this 
  insect 
  from 
  Davis, 
  Cal., 
  with 
  the 
  statement 
  that 
  it 
  was 
  

   causing 
  serious 
  damage 
  to 
  the 
  foilage 
  of 
  the 
  sugar 
  beet. 
  He 
  also 
  

   collected 
  it 
  on 
  sugar 
  beets 
  at 
  Hamilton 
  City, 
  Cal., 
  on 
  September 
  18^ 
  

   1911, 
  where 
  it 
  was 
  causing 
  some 
  injury. 
  He 
  wrote, 
  however, 
  that, 
  

   owing 
  to 
  the 
  lateness 
  of 
  the 
  season 
  when 
  the 
  beets 
  were 
  attacked 
  

   probably 
  only 
  slight 
  damage 
  resulted. 
  

  

  HABITS 
  OF 
  THE 
  ADULT. 
  

  

  For 
  a 
  short 
  time 
  after 
  emerging 
  from 
  the 
  pupa 
  this 
  insect 
  remains 
  

   quiet 
  and 
  appears 
  to 
  be 
  waiting 
  for 
  its 
  limbs 
  to 
  harden. 
  During 
  

   this 
  time 
  the 
  colors, 
  which 
  were 
  light 
  at 
  emergence, 
  gradually 
  darken. 
  

   After 
  hardening 
  the 
  thrips 
  moves 
  off 
  and 
  begins 
  feeding. 
  

  

  METHOD 
  OF 
  MATING. 
  

  

  The 
  males 
  and 
  females 
  of 
  this 
  species 
  seem 
  to 
  emerge 
  from 
  the 
  

   pupa 
  at 
  about 
  the 
  same 
  time. 
  During 
  this 
  investigation 
  it 
  was 
  ob- 
  

   served 
  that, 
  under 
  laboratory 
  conditions 
  at 
  least, 
  the 
  sexes 
  mated 
  

   generally 
  in 
  from 
  two 
  to 
  three 
  days 
  after 
  emergence 
  and 
  in 
  some 
  

   cases 
  in 
  even 
  less 
  time. 
  This 
  operation 
  has 
  been 
  observed 
  both 
  in 
  

   the 
  field 
  and 
  in 
  the 
  laboratory 
  and 
  was 
  identical 
  under 
  both 
  condi- 
  

   tions. 
  This 
  is 
  probably 
  best 
  described 
  by 
  the 
  original 
  field 
  notes 
  

   msftle 
  at 
  the 
  time 
  of 
  observation. 
  

   51097°— 
  Bull. 
  1 
  is 
  — 
  12 
  3 
  

  

  