﻿74 
  DECIDUOUS 
  FEUIT 
  INSECTS 
  AND 
  INSECTICIDES. 
  

  

  Male. 
  — 
  Length 
  3 
  mm. 
  Clypeus 
  more 
  obtusely 
  emarginate 
  than 
  in 
  female; 
  third 
  

   joint 
  shorter 
  than 
  fourth; 
  stigma 
  not 
  strongly 
  tapering; 
  hypopygidium 
  narrowly 
  rounded 
  

   at 
  apex. 
  Black; 
  antennae, 
  head 
  (except 
  interocellar 
  area), 
  margin 
  of 
  mesoprescutum, 
  

   lati, 
  pectus, 
  legs, 
  and 
  venter 
  reddish 
  yellow; 
  wings 
  as 
  in 
  female. 
  

  

  Type 
  locality. 
  — 
  Suisun, 
  Cal., 
  March 
  10, 
  1910 
  (R. 
  W. 
  Braucher); 
  eight 
  females 
  and 
  

   one 
  male. 
  

  

  Type. 
  — 
  Catalogue 
  No. 
  13471, 
  U. 
  S. 
  National 
  Museum. 
  

  

  On 
  April 
  20, 
  1909, 
  while 
  inspecting 
  the 
  cherry 
  orchard 
  of 
  Mr. 
  

   Charles 
  Barnes, 
  Suisun, 
  Cal., 
  for 
  the 
  extent 
  of 
  injury 
  caused 
  by 
  the 
  

   pear 
  thrips, 
  the 
  writer 
  found 
  several 
  cherries 
  infested 
  with 
  small 
  

   white 
  hymenopterous 
  larvae. 
  The 
  full-grown 
  larvae 
  were 
  about 
  five- 
  

   sixteenths 
  of 
  an 
  inch 
  long 
  and 
  apparently 
  did 
  most 
  of 
  the 
  feeding 
  

   inside 
  of 
  the 
  kernel, 
  or 
  in 
  the 
  flesh 
  immediately 
  adjoining 
  the 
  kernel. 
  

   Although 
  the 
  cherry 
  crop 
  was 
  light 
  the 
  injury 
  was 
  quite 
  general, 
  and 
  

   further 
  search 
  on 
  April 
  25 
  showed 
  the 
  little 
  larvae 
  in 
  greater 
  or 
  less 
  

   numbers 
  in 
  most 
  of 
  the 
  cherry 
  orchards 
  of 
  the 
  Suisun 
  Valley. 
  A 
  

   large 
  series 
  of 
  counts 
  made 
  of 
  the 
  fruit 
  in 
  Mr. 
  Barnes's 
  orchard 
  

   showed 
  approximately 
  80 
  per 
  cent 
  of 
  the 
  fruit 
  to 
  have 
  been 
  injured 
  

   by 
  these 
  larvae. 
  

  

  At 
  this 
  latter 
  date, 
  April 
  25, 
  most 
  of 
  the 
  larvae 
  were 
  full 
  grown. 
  

   Some 
  had 
  evidently 
  finished 
  feeding 
  and 
  had 
  left 
  the 
  fruit. 
  How- 
  

   ever, 
  careful 
  search 
  in 
  the 
  ground 
  under 
  the 
  trees 
  failed 
  to 
  show 
  the 
  

   presence 
  of 
  any 
  larvae 
  or 
  pupae. 
  A 
  large 
  quantity 
  of 
  infested 
  fruit 
  

   (See 
  PL 
  IX, 
  figs. 
  1, 
  2) 
  was 
  taken 
  to 
  the 
  laboratory 
  for 
  further 
  study 
  

   and 
  life-history 
  observations. 
  

  

  SEASONAL 
  HISTORY 
  AND 
  HABITS. 
  

  

  All 
  of 
  the 
  larvae 
  in 
  the 
  rearing 
  cages 
  had 
  left 
  the 
  fruit 
  and 
  had 
  

   gone 
  into 
  the 
  soil 
  in 
  the 
  bottom 
  of 
  the 
  cages 
  by 
  May 
  5. 
  1909. 
  None 
  

   of 
  them 
  pupated 
  among 
  the 
  sticks 
  and 
  trash 
  which 
  had 
  been 
  placed 
  

   in 
  the 
  cages 
  on 
  top 
  of 
  the 
  soil. 
  The 
  cages 
  were 
  sunk 
  in 
  the 
  ground 
  

   to 
  approach 
  as 
  nearly 
  as 
  possible 
  the 
  normal 
  out-of-doors 
  conditions. 
  

   Unfortunately 
  all 
  of 
  these 
  larvae 
  were 
  killed 
  by 
  drainage 
  water 
  from 
  

   a 
  near-by 
  sink 
  seeping 
  into 
  the 
  cage 
  during 
  the 
  absence 
  of 
  the 
  writer. 
  

  

  In 
  June, 
  1912, 
  the 
  writer 
  received 
  from 
  Mr. 
  P. 
  J. 
  O'Gara, 
  Medford, 
  

   Oreg., 
  a 
  consignment 
  of 
  cherries 
  showing 
  the 
  characteristic 
  injury 
  

   caused 
  by 
  this 
  species. 
  Mr. 
  O'Gara 
  stated 
  that 
  he 
  had 
  observed 
  

   the 
  larvae 
  in 
  a 
  few 
  orchards 
  in 
  one 
  locality 
  in 
  Jackson 
  County, 
  Oreg., 
  

   and 
  that 
  this 
  insect 
  also 
  attacked 
  prunes. 
  

  

  So 
  far 
  as 
  the 
  writer 
  has 
  learned 
  this 
  is 
  the 
  only 
  occurrence 
  of 
  the 
  

   cherry 
  fruit 
  sawfly 
  outside 
  of 
  the 
  State 
  of 
  California. 
  

  

  THE 
  ADULT. 
  

  

  Close 
  watch 
  was 
  kept 
  in 
  the 
  spring 
  of 
  1910 
  for 
  the 
  first 
  appearance 
  

   of 
  adults 
  in 
  the 
  field. 
  Mr. 
  R. 
  W. 
  Braucher, 
  who 
  was 
  detailed 
  to 
  

   look 
  after 
  the 
  demonstration 
  spraying 
  for 
  pear 
  thrips 
  in 
  that 
  locality 
  

  

  