﻿the 
  Hessian 
  Fly. 
  

  

  353 
  

  

  dry 
  spot 
  to 
  be 
  in 
  ; 
  this, 
  in 
  conjunction 
  with 
  the 
  laid 
  

   barley, 
  made 
  my 
  task 
  a 
  hard 
  one, 
  and 
  yet 
  I 
  managed 
  to 
  

   obtain 
  500 
  bent 
  straws, 
  and, 
  had 
  the 
  weather 
  been 
  finer, 
  

   I 
  could 
  easily 
  have 
  obtained 
  twice 
  that 
  number. 
  Mr. 
  

   Palmer 
  sent 
  me 
  another 
  sack 
  of 
  the 
  screenings 
  from 
  

   this 
  harvest, 
  the 
  puparia 
  being 
  so 
  plentiful 
  that 
  in 
  one 
  

   hour 
  I 
  picked 
  out 
  270, 
  the 
  largest 
  number 
  ever 
  found 
  in 
  

   that 
  time, 
  and, 
  from 
  what 
  Mr. 
  Palmer 
  told 
  me, 
  and 
  my 
  

   own 
  observations, 
  I 
  think 
  the 
  attack 
  was 
  the 
  most 
  serious 
  

   I 
  had 
  yet 
  seen. 
  

  

  The 
  sum 
  total 
  of 
  infested 
  straws 
  and 
  puparia 
  collected 
  

   in 
  two 
  years 
  was 
  4451, 
  from 
  which 
  I 
  bred 
  752 
  Hessian 
  

   Flies 
  ! 
  and 
  909 
  parasites. 
  All 
  the 
  flies 
  I 
  killed 
  and 
  used 
  

   for 
  microscopic 
  investigation, 
  and 
  of 
  the 
  parasites 
  I 
  have 
  

   turned 
  a 
  large 
  number 
  down 
  in 
  infested 
  districts. 
  

  

  Hessian 
  Flies 
  and 
  Parasites 
  bred 
  from 
  1309 
  Puparia 
  

  

  COLLECTED 
  IN 
  THE 
  StRAW, 
  AuG. 
  5tH 
  AND 
  8tH, 
  1887. 
  

  

  Date. 
  

  

  Hessian 
  

   Flies. 
  

  

  Paeasites. 
  

  

  Time 
  of 
  

   Emergence. 
  

  

  Wind. 
  

  

  Weathee. 
  

  

  1887. 
  

  

  ^ 
  

  

  ? 
  

  

  S' 
  

  

  ? 
  

  

  

  

  

  Aug. 
  7 
  

  

  

  

  1 
  

  

  

  

  

  

  10 
  

  

  

  

  

  1 
  

  

  

  

  

  11 
  

  

  

  

  2 
  

  

  1 
  

  

  

  

  

  14 
  

  

  

  

  1 
  

  

  1 
  

  

  

  

  

  18 
  

  

  

  

  

  2 
  

  

  

  

  

  19 
  

  

  

  

  

  1 
  

  

  

  

  

  21 
  

  

  

  

  2 
  

  

  1 
  

  

  

  

  

  24 
  

  

  

  

  3 
  

  

  3 
  

  

  

  

  

  25 
  

  

  

  

  

  2 
  

  

  

  

  

  27 
  

  

  

  

  

  3 
  

  

  

  

  

  29 
  

  

  

  

  4 
  

  

  11 
  

  

  

  

  

  30 
  

  

  

  

  1 
  

  

  6 
  

  

  

  

  

  81 
  

  

  

  

  1 
  

  

  

  

  

  

  Sept. 
  1 
  

  

  

  

  4 
  

  

  3 
  

  

  

  

  

  B 
  

  

  

  

  

  1 
  

  

  

  

  

  9 
  

  

  

  

  1 
  

  

  

  

  

  

  11 
  

  

  

  1 
  

  

  

  

  4 
  p.m. 
  

  

  W. 
  

  

  Dull. 
  

  

  17 
  

  

  

  

  

  1 
  

  

  

  

  Dull. 
  

  

  18 
  

  

  

  1 
  

  

  

  

  7 
  a.m. 
  

  

  W. 
  

  

  Dull. 
  

  

  28 
  

  

  

  

  

  1 
  

  

  

  

  

  28 
  

  

  

  

  

  1 
  

  

  

  

  

  1888. 
  

  

  

  

  

  

  

  

  

  April 
  28 
  

  

  

  

  1 
  

  

  1 
  

  

  

  

  

  May 
  16 
  

  

  

  

  2 
  

  

  

  

  

  

  18 
  

  

  

  

  3 
  

  

  

  

  

  

  19 
  

  

  1 
  

  

  

  2 
  

  

  

  

  N.W. 
  

  

  Warm. 
  

  

  