﻿172 
  REPORT 
  UNITED 
  STATES 
  ENTOMOLOGICAL 
  COMMISSION. 
  

  

  with 
  whitish 
  and 
  brown 
  or 
  black 
  hairs, 
  and 
  along 
  the 
  middle 
  of 
  the 
  

   back 
  of 
  the 
  abdomen 
  there 
  is 
  a 
  black 
  stripe, 
  of 
  which, 
  sometimes, 
  how- 
  

   ever, 
  all 
  but 
  the 
  ends 
  is 
  more 
  or 
  less 
  obsolete. 
  The 
  color 
  of 
  the 
  female 
  

   is 
  rabbit-gray, 
  or 
  speckled 
  black 
  and 
  white. 
  The 
  abdomen 
  is 
  acutely 
  

   tapering 
  and 
  ends 
  in 
  a 
  two-jointed 
  ovipositor. 
  

  

  Egg. 
  — 
  The 
  eggs 
  somewhat 
  resemble 
  in 
  form 
  hens' 
  eggs, 
  but 
  are 
  more 
  

   elongated. 
  They 
  are 
  very 
  delicate 
  in 
  texture, 
  yellowish, 
  reflecting 
  pris- 
  

   matic 
  colors, 
  and 
  are 
  smooth, 
  though 
  often 
  appearing 
  roughened 
  by 
  

   transverse 
  and 
  longitudinal 
  irregular 
  depressions. 
  

  

  Larva. 
  — 
  The 
  larva 
  has 
  but 
  four 
  prolegs, 
  in 
  addition 
  to 
  the 
  usual 
  three 
  

   pairs 
  of 
  thoracic 
  legs 
  on 
  the 
  anterior 
  portion 
  of 
  the 
  body, 
  these 
  prolegs^ 
  

   being 
  situated 
  on 
  the 
  9th 
  and 
  the 
  last 
  joints 
  of 
  the 
  body. 
  (It 
  may 
  thus 
  

   be 
  distinguished 
  from 
  the 
  larva 
  of 
  the 
  Fall 
  species, 
  which 
  has 
  an 
  addi- 
  

   tional 
  short 
  pair 
  of 
  prolegs 
  on 
  the 
  8th 
  joint.) 
  

  

  The 
  young 
  larva 
  is 
  dark 
  olive-green, 
  or 
  brown, 
  with 
  a 
  black, 
  shiny 
  

   head. 
  The 
  full-grown 
  worm 
  varies 
  gTeatly 
  in 
  the 
  intens- 
  

   ity 
  of 
  its 
  markings, 
  ash-gray, 
  green 
  and 
  yellow 
  ones 
  oc- 
  

   curring 
  in 
  the 
  same 
  brood. 
  The 
  most 
  constant 
  char- 
  

   acter 
  by 
  which 
  it 
  may 
  be 
  distinguished 
  from 
  other 
  span- 
  

   worms 
  of 
  the 
  same 
  size, 
  is 
  the 
  pattern 
  of 
  the 
  head, 
  which, 
  

   riG.i^Enir'rred 
  no 
  matter 
  what 
  the 
  general 
  hue 
  of 
  the 
  body 
  may 
  be, 
  is 
  

   ^aUacritJlllia'a^ 
  usually 
  shadcd 
  and 
  marked 
  as 
  shown 
  at 
  Fig. 
  1. 
  

  

  Another 
  distinguishing 
  character 
  is 
  the 
  occurrence 
  of 
  two 
  pale, 
  nar- 
  

   row 
  lines 
  on 
  the 
  middle 
  of 
  the 
  back, 
  the 
  space 
  between 
  them 
  usually 
  be- 
  

   ing 
  dark 
  and 
  occupied, 
  on 
  the 
  anterior 
  edge 
  and 
  on 
  the 
  middle 
  of 
  joints 
  

   5, 
  6, 
  7 
  and 
  11, 
  by 
  black 
  marks 
  somewhat 
  in 
  the 
  form 
  of 
  X 
  j 
  these 
  marks 
  

   being 
  represented 
  by 
  dots 
  on 
  the 
  other 
  joints. 
  There 
  are 
  two 
  rather 
  

   prominent 
  tubercles 
  on 
  top 
  of 
  the 
  eleventh 
  joint, 
  preceded 
  by 
  two 
  white 
  

   spots. 
  

  

  The 
  full-grown 
  larvae 
  measure 
  from 
  seven 
  to 
  nine-tenths 
  of 
  an 
  inch 
  

   [18-23°^^] 
  in 
  length. 
  

  

  Chrysalis. 
  — 
  Pale 
  grayish-brown, 
  with 
  a 
  dark 
  green 
  tinge 
  on 
  the 
  

   wing-sheaths. 
  Eemarkable 
  for 
  its 
  robustness 
  and 
  for 
  the 
  large 
  size 
  

   and 
  prominence 
  of 
  the 
  palpi. 
  A 
  single 
  bifurcate 
  thorn 
  at 
  extremity. 
  

   Length 
  0.35 
  inch 
  [9™™]; 
  diameter 
  across 
  thorax 
  0.12 
  inch 
  [3™°^]. 
  Both 
  

   sexes 
  in 
  the 
  chrysalis 
  state 
  have 
  wing-sheaths, 
  those 
  of 
  the 
  female 
  

   being 
  thinner 
  than 
  those 
  of 
  the 
  male, 
  and 
  shorter, 
  extending 
  only 
  to 
  

   the 
  posterior 
  edge 
  of 
  the 
  fourth 
  joint 
  of 
  the 
  abdomen, 
  while 
  in 
  the 
  male 
  

   the 
  wing-sheaths 
  are 
  one 
  joint 
  longer. 
  The 
  chrysalis 
  of 
  the 
  male 
  is 
  

   more 
  slender 
  than 
  that 
  of 
  the 
  female. 
  

  

  The 
  cocoons 
  are 
  simple 
  earthen 
  cells, 
  slightly 
  lined 
  with 
  silken 
  

   threads, 
  which 
  are 
  easily 
  broken 
  to 
  pieces. 
  

  

  HABITS 
  AND 
  NATURAL 
  HISTORY. 
  

  

  Issuance 
  of 
  the 
  moths. 
  — 
  The 
  moths 
  or 
  perfect 
  insects 
  rise 
  from 
  

   the 
  ground, 
  for 
  the 
  most 
  i)art, 
  early 
  in 
  the 
  spring 
  — 
  generally 
  from 
  the 
  

  

  