﻿14 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  first 
  generation 
  may 
  spin 
  their 
  oval, 
  brown 
  cocoons 
  in 
  leaves 
  or 
  

   other 
  debris. 
  The 
  second 
  generation 
  presumably 
  hibernate 
  in 
  the 
  

   cocoon, 
  adults 
  appearing 
  the 
  following 
  spring 
  and 
  depositing 
  their 
  

   eggs 
  in 
  minute 
  slits 
  on 
  either 
  or 
  both 
  sides 
  of 
  the 
  petiole 
  in 
  series 
  

   of 
  10 
  to 
  15 
  or 
  even 
  more, 
  since 
  Dr 
  Lintner 
  records 
  as 
  many 
  as 
  28 
  

   or 
  30 
  in 
  one 
  row. 
  

  

  Description. 
  The 
  egg 
  is 
  pearly 
  white, 
  oval 
  and 
  about 
  i 
  mm 
  in 
  

   length. 
  Its 
  position 
  is 
  indicated 
  by 
  a 
  slight 
  swelling 
  about 
  1.5 
  mm 
  

   long, 
  the 
  swellings 
  being 
  about 
  i 
  mm 
  apart. 
  

  

  Larva. 
  The 
  young 
  larvae 
  are 
  about 
  6 
  mm 
  long, 
  have 
  dark 
  

   brown 
  or 
  blackish 
  heads 
  and 
  pale 
  green 
  or 
  yellowish 
  green 
  bodies. 
  

  

  Partly 
  grown 
  larva. 
  Length 
  i 
  cm. 
  Head 
  subglobose, 
  jet-black, 
  

   the 
  most 
  of 
  the 
  body 
  being 
  a 
  very 
  pale 
  green 
  with 
  a 
  conspicuous 
  

   row 
  of 
  sublateral, 
  subquadrate, 
  black 
  spots, 
  a 
  pair 
  on 
  each 
  segment. 
  

   The 
  anterior 
  portion 
  of 
  the 
  body, 
  namely 
  the 
  first 
  thoracic 
  seg- 
  

   ment 
  and 
  the 
  lateral 
  tubercles 
  on 
  the 
  2d, 
  3d 
  and 
  the 
  nth 
  seg- 
  

   ments, 
  particularly 
  laterally, 
  is 
  variably 
  tinged 
  with 
  pale 
  orange, 
  

   giving 
  a 
  very 
  characteristic 
  appearance. 
  The 
  larvae 
  are 
  rather 
  

   thickly 
  clothed 
  with 
  short, 
  whitish 
  setae 
  arising 
  from 
  inconspicuous 
  

   tubercles. 
  True 
  legs 
  pale 
  yellowish 
  basally, 
  yellowish 
  transparent 
  

   apically. 
  The 
  whitish 
  transparent 
  prolegs 
  occur 
  on 
  the 
  2d 
  to 
  the 
  

   7ih 
  and 
  8th 
  and 
  9th 
  abdominal 
  segments, 
  each 
  segment 
  also 
  with 
  

   a 
  small, 
  black, 
  lateral 
  dot. 
  Anal 
  plate 
  subcircular, 
  black 
  with 
  whit- 
  

   ish 
  setose 
  tubercles. 
  

  

  Full-grown 
  larva. 
  Length 
  1.5 
  cm. 
  Head 
  jet-black. 
  Body 
  a 
  deep 
  

   yellowish 
  orange, 
  sparsely 
  covered 
  v/ith 
  fine, 
  whitish 
  hairs 
  and 
  with 
  

  

  a 
  conspicuous 
  row 
  of 
  irregu- 
  

   lar 
  subquadrate 
  lateral 
  mark- 
  

   ings, 
  a 
  pair 
  on 
  each 
  segment, 
  

   and 
  a 
  substigmatal 
  row 
  of 
  small 
  

   triangular, 
  black 
  markings. 
  The 
  

   _, 
  T. 
  1 
  <*i 
  j^- 
  ~ 
  black 
  anal 
  plate 
  bears 
  several 
  

  

  Fig. 
  2 
  Poplar 
  sav/fly, 
  side 
  view 
  of 
  larva, 
  en- 
  r 
  

  

  larged. 
  (Original) 
  pairs 
  of 
  subiiiedian 
  white 
  setae. 
  

  

  Adult. 
  Length 
  .8 
  cm. 
  Wing 
  spread 
  1.8 
  cm. 
  Head 
  shining 
  

   black, 
  short, 
  broad. 
  Antennae 
  nearly 
  as 
  long 
  as 
  the 
  -body, 
  com- 
  

   posed 
  of 
  nine 
  segments, 
  the 
  first 
  two 
  short, 
  the 
  others 
  long, 
  slender 
  

   and 
  tapering 
  successively 
  to 
  the 
  apex. 
  Thorax 
  black 
  dorsally, 
  the 
  

   venter 
  and 
  the 
  abdomen 
  yellowish. 
  Wings 
  yellowish 
  basally, 
  the 
  

   stigma 
  large, 
  distinct. 
  Legs 
  mostly 
  pale 
  yellowish, 
  the 
  pulvilli 
  

   dark 
  brown. 
  

  

  