﻿BRITISH 
  LEPIDOPTERA. 
  

  

  appear 
  to 
  do 
  in 
  the 
  case 
  of 
  G. 
  pallidactyla, 
  and, 
  as 
  their 
  respective 
  sizes' 
  

   would 
  suggest, 
  in 
  G. 
  ochrodactyla 
  also, 
  for 
  I 
  found, 
  on 
  carefully 
  

   measuring 
  a 
  brown 
  larva 
  and 
  a 
  green 
  one 
  that 
  was 
  somewhat 
  larger 
  

   and 
  more 
  bulky, 
  that 
  their 
  heads 
  were 
  of 
  exactly 
  the 
  same 
  size. 
  From 
  

   this 
  it 
  would 
  appear 
  that 
  the 
  period 
  at 
  which 
  this 
  coat 
  is 
  obtained 
  is 
  a 
  

   variable 
  one, 
  or 
  else 
  that 
  the 
  brown 
  larvae 
  can 
  attain 
  the 
  green 
  form 
  

   without 
  the 
  necessity 
  of 
  a 
  moult. 
  The 
  change 
  in 
  these 
  i 
  two 
  

   larval 
  forms 
  simply 
  amounts 
  to 
  the 
  replacement 
  of 
  the 
  brown 
  areas 
  by 
  

   a 
  vivid 
  green. 
  Description 
  of 
  the 
  brown 
  form 
  : 
  The 
  larva 
  is 
  quite 
  of 
  

   the 
  normal 
  Platyptiliid 
  form 
  ; 
  head 
  pale 
  green, 
  surface 
  polished, 
  

   shape 
  rounded, 
  with 
  brown 
  mouth 
  -parts 
  and 
  black 
  ocelli 
  ; 
  capable 
  of 
  

   partial 
  retraction 
  beneath 
  prothorax. 
  Body 
  : 
  The 
  prothoracic 
  scutellum 
  

   is 
  very 
  distinct, 
  of 
  a 
  very 
  pale 
  yellow 
  -brown 
  colour. 
  The 
  meso- 
  and 
  

   metathoracic 
  segments 
  have 
  three 
  nearly 
  equal 
  subdivisions, 
  the 
  

   central 
  one 
  bearing 
  the 
  tubercles. 
  The 
  subdivision 
  of 
  the 
  abdominal 
  

   segments 
  consists 
  of 
  a 
  large 
  anterior 
  subsegment 
  carrying 
  tubercle 
  i, 
  

   with 
  two 
  small 
  subsegments 
  behind 
  it, 
  the 
  middle 
  subsegmenfe 
  

   carrying 
  ii. 
  The 
  anal 
  plate, 
  though 
  large 
  and 
  chitinous, 
  is 
  not 
  

   distinctively 
  coloured. 
  There 
  is 
  a 
  clear, 
  but 
  only 
  slightly 
  raised, 
  

   lateral 
  flange. 
  Coloration 
  : 
  The 
  dorsal 
  area 
  is 
  pale 
  brown, 
  and 
  down' 
  

   the 
  centre 
  of 
  this 
  area 
  there 
  is 
  a 
  sharply 
  marked 
  and 
  much 
  darker 
  

   brown 
  band, 
  while 
  there 
  are 
  similar 
  sharply 
  marked 
  subdorsal 
  bands 
  

   of 
  the 
  same 
  colour, 
  bordered 
  by 
  a 
  whitish 
  area 
  which 
  fades 
  off 
  above 
  

   into 
  the 
  general 
  brown 
  of 
  the 
  dorsal 
  area, 
  and 
  beneath 
  into 
  another 
  

   brown 
  band 
  which 
  encloses 
  the 
  spiracles 
  ; 
  below 
  this 
  again, 
  the 
  lateral 
  

   flange 
  is 
  whitish, 
  bordered 
  along 
  its 
  lower 
  edge 
  by 
  a 
  dark 
  brown 
  

   stripe, 
  the 
  subventral 
  and 
  ventral 
  areas 
  being 
  alike 
  of 
  a 
  very 
  pale 
  

   brown. 
  The 
  prolegs 
  are, 
  as 
  usual, 
  rather 
  long, 
  both 
  these 
  and 
  the 
  

   true 
  legs 
  having 
  no 
  distinctive 
  coloration. 
  The 
  spiracles 
  are 
  large 
  and 
  

   slightly 
  raised 
  with 
  a 
  broad 
  dark 
  brown 
  chitinous 
  rim. 
  The 
  body 
  is 
  

   covered 
  by 
  a 
  coat 
  of 
  fine 
  spicules, 
  and 
  there 
  is 
  also 
  a 
  fairly 
  even 
  coat 
  

   of 
  tapering 
  secondary 
  hairs. 
  The 
  primary 
  setae 
  are 
  of 
  medium 
  

   length, 
  simple 
  and 
  tapering, 
  with 
  well-marked 
  raised 
  black 
  chitinous 
  

   bases 
  ; 
  in 
  position 
  they 
  seem 
  to 
  exactly 
  agree 
  with 
  those 
  of 
  G. 
  palli- 
  

   dactyla. 
  (2) 
  The 
  green 
  form 
  : 
  This 
  seems 
  to 
  differ 
  only 
  in 
  the 
  points 
  

   above 
  mentioned, 
  except, 
  perhaps, 
  in 
  one 
  small 
  particular, 
  viz., 
  that 
  

   the 
  secondary 
  hairs 
  are 
  much 
  less 
  noticeable 
  on 
  the 
  white 
  areas 
  than 
  

   elsewhere, 
  and 
  this, 
  I 
  think, 
  applies 
  specially 
  to 
  the 
  green 
  form. 
  This 
  

   seems 
  to 
  be 
  due 
  to 
  their 
  colour 
  on 
  these 
  areas 
  not 
  contrasting 
  with 
  

   the 
  skin 
  ; 
  certainly 
  these 
  hairs 
  are 
  not 
  absent 
  from 
  these 
  areas, 
  and, 
  so 
  

   far 
  as 
  my 
  discrimination 
  goes, 
  they 
  are 
  not 
  less 
  numerous 
  (Bacot. 
  

   June 
  26th, 
  1904). 
  Buckler 
  figured 
  (Larvae, 
  etc., 
  pi. 
  clxiii., 
  figs. 
  3-3a), 
  

   on 
  June 
  8th, 
  1875, 
  two 
  larvae 
  of 
  this 
  species 
  after 
  their 
  final 
  moult, 
  

   one 
  representing 
  a 
  paler, 
  the 
  other 
  a 
  darker, 
  green 
  form. 
  

  

  Comparison 
  of 
  larvje 
  of 
  Gillmeria 
  ochrodactyla 
  and 
  G. 
  palli- 
  

   dactyla. 
  — 
  The 
  larva 
  resembles 
  that 
  of 
  G. 
  pallidactyla 
  a 
  great 
  deal. 
  It 
  

   has 
  precisely 
  the 
  same 
  outline, 
  and 
  the 
  same 
  alternation 
  of 
  dark 
  and 
  

   light 
  stripes, 
  viz., 
  a 
  dark 
  dorsal 
  line, 
  a 
  broad 
  pale 
  stripe 
  including 
  i 
  and 
  

   ii, 
  a 
  narrow 
  dark 
  line 
  including 
  iii, 
  a 
  broad 
  dark 
  lateral 
  stripe 
  includ- 
  

   ing 
  the 
  spiracle, 
  a 
  pale 
  lateral 
  line 
  including 
  iv 
  and 
  the 
  flange 
  ; 
  below 
  

   this, 
  dark 
  with 
  faintly 
  paler 
  tint 
  along 
  vi 
  and 
  vii 
  (?). 
  The 
  differences 
  

   are 
  first 
  and 
  chiefly 
  (i.e., 
  most 
  important) 
  that 
  the 
  pale 
  and 
  dark 
  

   lines 
  are 
  not 
  so 
  marked 
  as 
  in 
  G. 
  pallidactyla, 
  the 
  pale 
  is 
  not 
  so 
  

   pale 
  ; 
  the 
  flange 
  stripes, 
  so 
  clear 
  white 
  and 
  porcelain 
  -like 
  in 
  G. 
  palli- 
  

  

  