﻿208 
  REPORT 
  UNITED 
  STATES 
  ENTOMOLOGICAL 
  COMMISSION. 
  

  

  paler 
  small 
  ovipositor 
  forming 
  the 
  tenth. 
  The 
  latter 
  is 
  one-half 
  as 
  thick 
  

   as 
  the 
  ninth 
  segment, 
  and 
  about 
  two-thirds 
  or 
  quite 
  as 
  longj 
  is 
  slightly 
  

   sinuous, 
  and 
  a 
  little 
  smaller 
  at 
  the 
  end 
  than 
  at 
  the 
  base. 
  The 
  wings 
  are 
  

   dusky, 
  with 
  a 
  fine 
  fringe 
  around 
  the 
  edge, 
  and 
  there 
  are 
  three 
  veins. 
  

   The 
  subcostal 
  vein 
  ends 
  near 
  the 
  outer 
  third 
  of 
  the 
  wingj 
  the 
  median 
  

   vein 
  arises 
  from 
  near 
  the 
  base 
  of 
  the 
  submedian 
  vein 
  and 
  runs 
  nearly 
  

   parallel 
  to 
  the 
  subcostal 
  vein, 
  while 
  a 
  branch 
  (its 
  base 
  disconnected 
  with 
  

   the 
  main 
  vein) 
  extends 
  along 
  the 
  middle 
  of 
  the 
  wing; 
  the 
  submedian 
  vein 
  

   is 
  well 
  developed, 
  at 
  the 
  base 
  throwing 
  off 
  the 
  median 
  vein 
  at 
  a 
  little 
  

   distant^e 
  from 
  the 
  base 
  of 
  the 
  wing, 
  and 
  losing 
  itself 
  before 
  turning 
  down 
  

   to 
  the 
  edge 
  of 
  the 
  wing. 
  The 
  length 
  of 
  the 
  fly 
  is 
  2.5 
  millimeters, 
  or 
  about 
  

   one 
  line, 
  i. 
  e., 
  ^V 
  of 
  an 
  inch. 
  

  

  The 
  male.— 
  The 
  male 
  is 
  rather 
  smaller 
  than 
  the 
  female, 
  being 
  distin- 
  

   guished 
  by 
  the 
  long, 
  slender 
  abdomen, 
  and 
  the 
  longer 
  and 
  more 
  hairy 
  

   antennse. 
  The 
  joints 
  of 
  the 
  latter 
  (Plate 
  Y, 
  Fig. 
  A, 
  a" 
  y 
  a'") 
  are 
  twenty 
  in 
  

   number, 
  oval, 
  the 
  terminal 
  one 
  conical, 
  and 
  all 
  provided 
  with 
  a 
  few 
  hairs^ 
  

   much 
  longer 
  than 
  in 
  the 
  female, 
  and 
  arranged 
  in 
  a 
  decidedly 
  verticillate 
  

   manner. 
  ^'The 
  abdomen 
  in 
  the 
  living 
  specimen 
  is 
  black 
  or 
  brownish 
  

   black, 
  with 
  bands 
  at 
  the 
  sutures 
  both 
  above 
  and 
  beneath, 
  of 
  a 
  brick 
  red, 
  

   tawny 
  yellow, 
  or 
  grayish 
  color, 
  varying 
  in 
  their 
  width 
  as 
  this 
  part 
  of 
  the 
  

   body 
  is 
  more 
  or 
  less 
  distended." 
  (Fitch.) 
  The 
  claspers 
  at 
  the 
  end 
  of 
  

   the 
  body 
  are 
  stout, 
  much 
  more 
  so 
  than 
  in 
  Cecidomyia 
  leguminicola 
  of 
  th& 
  

   clover. 
  

  

  The 
  egg 
  (Plate 
  lY, 
  a, 
  enlarged) 
  is 
  very 
  minute, 
  about 
  a 
  fiftieth 
  of 
  an 
  

   inch 
  long, 
  cylindrical, 
  pointed 
  at 
  each 
  end, 
  the 
  shell 
  shining 
  and 
  trans- 
  

   parent, 
  the 
  egg 
  being 
  of 
  a 
  pale 
  red 
  color 
  when 
  the 
  embryo 
  is 
  nearly 
  de- 
  

   veloped. 
  

  

  The 
  larva. 
  — 
  ^After 
  remaining 
  about 
  four 
  days 
  in 
  the 
  egg 
  state, 
  the 
  larva 
  

   or 
  maggot 
  of 
  the 
  Hessian 
  Fly 
  hatches, 
  and 
  is 
  of 
  the 
  form 
  represented 
  

   by 
  Plate 
  lY, 
  Fig. 
  h, 
  and 
  Plate 
  Y, 
  Fig. 
  B, 
  Ba, 
  Bb, 
  Be. 
  

  

  The 
  body 
  is 
  soft, 
  smooth, 
  shining, 
  oval-cylindrical, 
  beneath 
  a 
  little 
  

   flattened, 
  and 
  consists 
  of 
  twelve 
  segments 
  besides 
  the 
  head, 
  the 
  latter 
  

   soft, 
  fleshy, 
  and 
  but 
  slightly 
  separated 
  from 
  the 
  body, 
  with 
  very 
  rudi- 
  

   mentary 
  mouth-parts 
  (jaws, 
  &c.). 
  The 
  rings 
  or 
  segments 
  are 
  moderately 
  

   convex 
  and 
  tolerably 
  distinct 
  from 
  one 
  another; 
  the 
  sutures 
  between 
  

   the 
  segments 
  in 
  the 
  living 
  larva 
  being 
  indicated 
  by 
  faint 
  transverse 
  

   lines 
  of 
  a 
  greenish-brown 
  hue, 
  according 
  to 
  Fitch, 
  who 
  also 
  states 
  that 
  

   the 
  mature 
  worm, 
  freshly 
  taken 
  from 
  the 
  rotrts 
  of 
  the 
  wheat, 
  measures 
  

   about 
  0.15 
  of 
  an 
  inch 
  in 
  length 
  by 
  0.06 
  inch 
  in 
  width. 
  Mr. 
  Eiley 
  informs 
  

   us 
  that 
  there 
  are 
  nine 
  pairs 
  of 
  minute 
  spiracles, 
  which 
  appear 
  as 
  yellow- 
  

   ish, 
  rounded 
  tubercles. 
  

  

  The 
  puparium 
  or 
  flaxseed 
  state 
  (Plate 
  lY, 
  Fig. 
  e, 
  Plate 
  Y, 
  Fig. 
  Z>). 
  — 
  

   When 
  fully 
  grown 
  the 
  larva 
  is 
  ready 
  to 
  transform 
  into 
  the 
  third 
  or 
  pupa 
  

   stage 
  of 
  its 
  transformations. 
  The 
  body 
  turns 
  brown, 
  and 
  finally 
  of 
  a 
  

   bright 
  chestnut 
  color, 
  while 
  the 
  skin 
  looses 
  all 
  appearance 
  of 
  sutures, 
  and 
  

   assumes 
  a 
  rude, 
  spindle-shaped 
  form, 
  somewhat 
  larger 
  than 
  the 
  larva. 
  

  

  