﻿482 
  BRITISH 
  LEPIDOPTERA. 
  

  

  long, 
  in 
  position 
  for 
  moulting. 
  Head 
  drawn 
  in 
  ventrally, 
  invisible 
  

   from 
  upperside 
  ; 
  prothorax 
  and 
  nietathorax 
  also 
  drawn 
  down 
  ventrally. 
  

   Skin 
  of 
  a 
  dull 
  greyish-yellow 
  ; 
  segments 
  distended, 
  intersegmental 
  

   incisions 
  stretched, 
  but 
  very 
  clearly 
  marked. 
  Tubercles 
  as 
  before, 
  the 
  

   hairs, 
  however, 
  much 
  broken, 
  the 
  longer 
  black 
  and 
  white 
  setae 
  less 
  

   disturbed. 
  The 
  spiracles 
  drawn 
  in, 
  and 
  appearing 
  as 
  small, 
  black, 
  

   shiny 
  plates. 
  The 
  9th 
  and 
  10th 
  abdominal 
  segments 
  much 
  contracted, 
  

   their 
  whole 
  area 
  being, 
  as 
  it 
  were, 
  covered 
  with 
  complex, 
  tubercular, 
  

   warts, 
  similar 
  to 
  those 
  on 
  the 
  preceding 
  segments. 
  Final 
  instar: 
  A 
  

   larva 
  that 
  has 
  just 
  completed 
  a 
  moult 
  is 
  of 
  a 
  peculiar 
  dove-grey, 
  owing 
  

   to 
  the 
  pale 
  hairs 
  and 
  pinkish 
  skin, 
  but 
  it 
  is 
  much 
  too 
  hairy 
  to 
  allow 
  of 
  

   any 
  description 
  in 
  detail 
  before 
  it 
  has 
  filled 
  out 
  somewhat. 
  A 
  large 
  

   larva 
  in 
  same 
  skin, 
  at 
  rest, 
  is 
  8mm. 
  to 
  9mm. 
  in 
  length. 
  It 
  rests 
  with 
  

   its 
  head 
  turned 
  downwards 
  and 
  its 
  thorax 
  compressed, 
  so 
  that 
  its 
  

   greatest 
  girth 
  appears 
  to 
  be 
  towards 
  the 
  anterior 
  end, 
  and 
  it 
  appears 
  to 
  

   have 
  a 
  longer 
  and 
  more 
  gradual 
  taper 
  posteriorly 
  than 
  anteriorly. 
  

   Otherwise 
  than 
  this, 
  it 
  is 
  of 
  the 
  same 
  shape 
  as 
  the 
  smaller 
  larvae, 
  

   except, 
  perhaps, 
  that 
  the 
  segmentation 
  in 
  the 
  smaller 
  larvae 
  was 
  rather 
  

   accentuated, 
  owing 
  to 
  the 
  approach 
  of 
  a 
  moult. 
  In 
  colour 
  there 
  is 
  a 
  

   complete 
  change, 
  the 
  skin 
  being 
  now 
  of 
  a 
  bright 
  yellow, 
  with 
  some 
  

   red 
  mottling 
  on 
  the 
  lateral 
  area 
  of 
  the 
  thoracic 
  segments. 
  The 
  

   spiracles 
  are 
  not 
  so 
  tall 
  as 
  previously, 
  and 
  are 
  of 
  a 
  paler 
  hue, 
  which 
  

   renders 
  them 
  less 
  conspicuous. 
  The 
  tubercles 
  are 
  pale 
  brown, 
  and 
  the 
  

   head 
  is 
  also 
  paler, 
  the 
  dark 
  brown 
  or 
  black 
  markings 
  of 
  the 
  previous 
  

   skin 
  being 
  replaced 
  by 
  pale 
  brown. 
  To 
  the 
  naked 
  eye 
  the 
  spicules 
  

   appear 
  to 
  be 
  smaller 
  in 
  comparison, 
  and 
  more 
  closely 
  set, 
  and 
  much 
  

   less 
  conspicuous 
  in 
  consequence. 
  The 
  hairs 
  are 
  similar 
  to 
  those 
  

   of 
  the 
  earlier 
  stage, 
  but 
  are 
  more 
  conspicuous, 
  partly, 
  I 
  think, 
  

   owing 
  to 
  their 
  greater 
  length, 
  and 
  partly 
  to 
  a 
  considerable 
  increase 
  

   in 
  their 
  numbers. 
  The 
  postspiracular 
  group 
  of 
  (secondary 
  or 
  body) 
  

   hairs 
  forms 
  a 
  much 
  more 
  conspicuous 
  feature, 
  but 
  there 
  is 
  no 
  raised 
  skin- 
  

   area, 
  nor 
  any 
  sign 
  of 
  a 
  wart. 
  No 
  clear 
  subdivision 
  of 
  the 
  segments 
  can 
  

   be 
  made 
  out. 
  Long 
  hairs 
  are 
  minutely 
  thorned 
  (Bacot, 
  May 
  1st, 
  1904). 
  

   Final 
  instar 
  (well-grown) 
  : 
  Much 
  stouter, 
  and 
  plumper 
  in 
  build, 
  than 
  

   in 
  the 
  preceding 
  stadium, 
  less 
  attenuated 
  at 
  the 
  ends, 
  and 
  altogether 
  

   more 
  stumpy, 
  but 
  still 
  not 
  flattened 
  ventrally 
  ; 
  8mm. 
  at 
  rest, 
  9mm.- 
  

   10mm. 
  when 
  crawling. 
  The 
  larva 
  examined 
  has 
  lost 
  the 
  whole 
  of 
  its 
  

   red 
  coloration, 
  and 
  is 
  now 
  of 
  a 
  delicate 
  yellowish-green, 
  much 
  whiter 
  

   towards 
  the 
  anterior 
  edge 
  of 
  each 
  segment 
  and 
  at 
  the 
  bases 
  of 
  the 
  

   tubercles, 
  much 
  yellower 
  at 
  the 
  hinder 
  parts 
  of 
  the 
  segments, 
  and 
  

   there 
  is 
  certainly 
  no 
  clear 
  trace 
  of 
  a 
  second 
  subsegment 
  when 
  the 
  larva 
  

   is 
  at 
  rest. 
  A 
  somewhat 
  darker 
  greenish 
  line 
  is 
  traceable, 
  as 
  a 
  medio- 
  

   dorsal, 
  from 
  the 
  prothorax 
  to 
  the 
  anal 
  flap. 
  The 
  tubercles 
  are 
  

   splendidly 
  developed, 
  the 
  bases 
  pale, 
  the 
  hairs 
  very 
  numerous 
  and 
  

   variable 
  in 
  length, 
  but 
  the 
  body-surface 
  covered 
  to 
  nothing 
  like 
  

   the 
  extent 
  it 
  is 
  in 
  the 
  preceding 
  instar, 
  owing 
  to 
  the 
  great 
  growth 
  

   of 
  the 
  larva 
  in 
  width 
  as 
  well 
  as 
  length, 
  i.e., 
  the 
  tubercles 
  occupy 
  

   much 
  less 
  space 
  in 
  proportion 
  to 
  the 
  size 
  of 
  the 
  larva. 
  The 
  

   skin 
  is 
  still 
  heavily 
  shagreened. 
  There 
  is 
  no 
  trace 
  of 
  a 
  sub- 
  

   spiracular 
  flange, 
  but, 
  below 
  the 
  spiracular 
  area, 
  the 
  body 
  is 
  more 
  

   distinctly 
  yellow-green. 
  The 
  head 
  is 
  of 
  a 
  semi-transparent, 
  pale, 
  

   greenish-grey, 
  the 
  mouth-parts 
  almost 
  colourless; 
  a 
  brown 
  patch 
  

   above 
  them 
  ; 
  the 
  summit 
  of 
  the 
  clypeus 
  is 
  also 
  tinged 
  w 
  T 
  ith 
  brown 
  ; 
  

  

  