﻿l88 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  It 
  will 
  be 
  seen 
  by 
  consulting 
  it, 
  that 
  the 
  shortest 
  period 
  between 
  the 
  

   spinning 
  up 
  of 
  the 
  larva 
  and 
  pupation 
  was 
  but 
  three 
  days, 
  — 
  the 
  longest 
  

   fifteen, 
  and 
  the 
  average 
  a 
  little 
  over 
  seven 
  days 
  and 
  one-half. 
  The 
  

   shortest 
  period 
  of 
  pupation 
  was 
  twenty-five 
  days, 
  and 
  the 
  longest 
  sixty 
  

   — 
  the 
  average 
  being 
  nearly 
  thirty- 
  eight 
  days. 
  

  

  The 
  Pupa. 
  

  

  The 
  larva 
  spins 
  a 
  thin 
  netting 
  of 
  yellowish 
  silk 
  with 
  little 
  amber 
  beads 
  

   at 
  the 
  joining 
  of 
  the 
  threads 
  just 
  before 
  pupating. 
  No 
  description 
  of 
  the 
  

   pupa 
  was 
  made, 
  but 
  it 
  has 
  been 
  described 
  by 
  Dr. 
  Dyar 
  as 
  follows 
  : 
  

  

  '' 
  Robust, 
  of 
  normal 
  shape 
  ; 
  on 
  the 
  abdominal 
  segments, 
  dorsally 
  and 
  

   subventrally 
  are 
  ten 
  rows 
  of 
  large 
  tufts 
  of 
  short 
  spiny 
  hairs, 
  the 
  tufts 
  

   smaller 
  ventrally 
  and 
  less 
  numerous 
  posteriorly 
  ; 
  cremaster, 
  two 
  tufts 
  of 
  

   reddish 
  spines 
  from 
  elevated 
  bases. 
  Color 
  black, 
  reddish 
  in 
  the 
  abdo- 
  

   minal 
  incisures 
  ; 
  the 
  body 
  is 
  smooth 
  and 
  dull, 
  the 
  wing 
  cases 
  more 
  shiny, 
  

   creased. 
  Spiracles 
  linear, 
  reddish. 
  Length 
  35 
  mm., 
  width 
  13 
  mm." 
  

  

  The 
  Imago. 
  

  

  This 
  beautiful 
  insect 
  with 
  a 
  wing-spread 
  of 
  from 
  two 
  and 
  three-quarter 
  

   inches 
  in 
  the 
  male 
  to 
  three 
  and 
  a 
  half 
  in 
  the 
  female 
  is 
  a 
  desirable 
  addition 
  

   to 
  the 
  cabinet 
  of 
  a 
  collector. 
  Its 
  lustrous 
  blue 
  abdomen 
  marked 
  with 
  

   orange 
  down 
  the 
  middle 
  and 
  on 
  the 
  sides, 
  and 
  the 
  sharp 
  black 
  markings 
  

   of 
  the 
  thorax 
  and 
  wings 
  on 
  a 
  white 
  background, 
  give 
  the 
  insect 
  a 
  striking 
  

   appearance. 
  There 
  is 
  considerable 
  variation 
  in 
  the 
  markings 
  in 
  different 
  

   individuals 
  as 
  will 
  be 
  seen 
  on 
  plate 
  i, 
  and 
  particularly 
  so 
  when 
  the 
  

   sexes 
  are 
  compared. 
  The 
  irregular 
  black 
  rings 
  that 
  adorn 
  the 
  thorax 
  

   and 
  wings 
  of 
  the 
  female, 
  tend 
  to 
  become 
  black 
  spots 
  in 
  the 
  male, 
  as 
  

   seen 
  in 
  figure 
  2 
  of 
  plate 
  I. 
  More 
  often, 
  however, 
  the 
  costal 
  and 
  some 
  

   of 
  the 
  smaller 
  discal 
  rings 
  on 
  the 
  wings 
  and 
  those 
  of 
  the 
  thorax 
  are 
  re- 
  

   placed 
  by 
  spots 
  (see 
  figures). 
  It 
  will 
  also 
  be 
  noticed 
  that 
  the 
  posterior 
  

   thoracic 
  spots 
  of 
  the 
  male 
  are 
  frequently 
  blue, 
  while 
  in 
  the 
  female 
  the 
  

   corresponding 
  marking 
  are 
  a 
  much 
  darker 
  blue 
  or 
  a 
  black. 
  

  

  A 
  variety 
  of 
  this 
  species, 
  denicdata 
  Slosson, 
  in 
  which 
  the 
  tips 
  of 
  the 
  

   primaries 
  are 
  invariably 
  denuded, 
  has 
  been 
  described 
  from 
  Florida. 
  

  

  Life-History. 
  

  

  So 
  far 
  as 
  known 
  there 
  appears 
  to 
  be 
  but 
  a 
  single 
  annual 
  generation. 
  

   The 
  nearly 
  full-grown 
  larvae 
  are 
  commonly 
  observed 
  in 
  the 
  autumn, 
  and 
  

   in 
  this 
  stage 
  usually 
  hibernate. 
  The 
  caterpillars 
  can 
  successfully 
  with- 
  

   stand 
  a 
  great 
  degree 
  of 
  cold. 
  They 
  may 
  even 
  be 
  revived 
  after 
  having 
  

  

  