﻿144 
  BRITISH 
  LEPIDOPTERA. 
  

  

  well-developed. 
  There 
  is 
  also 
  a 
  well- 
  developed 
  pale 
  subspiracular 
  flange 
  

   starting 
  on 
  either 
  side 
  from 
  one 
  of 
  the 
  prothoracic 
  points, 
  and 
  ending 
  

   with 
  the 
  anal 
  flap. 
  There 
  is 
  the 
  slightest 
  trace 
  of 
  a 
  mediodorsal 
  line 
  

   (? 
  depression) 
  from 
  the 
  mesothorax 
  to 
  the 
  caudal 
  horn, 
  and 
  the 
  

   primary 
  tubercular 
  setae, 
  although 
  exceedingly 
  minute, 
  are 
  traceable, 
  

   and 
  there 
  are 
  two 
  long 
  sets, 
  one 
  on 
  either 
  side 
  of 
  the 
  anus 
  stretching 
  

   back 
  posteriorly, 
  apparently 
  the 
  only 
  long 
  hairs 
  on 
  the 
  body. 
  The 
  

   true 
  legs 
  are 
  pale 
  green, 
  as 
  also 
  are 
  the 
  prolegs 
  (of 
  the 
  same 
  tint 
  as 
  

   the 
  venter). 
  The 
  latter 
  are 
  short 
  and 
  strong 
  for 
  a 
  plume 
  larva, 
  

   and 
  very 
  different 
  from 
  the 
  long 
  slender 
  prolegs 
  characteristic 
  

   of 
  so 
  many 
  Alucitid 
  larvae. 
  The 
  venter 
  is 
  flattened, 
  and 
  the 
  larva 
  as 
  a 
  

   whole 
  less 
  cylindrical 
  than 
  the 
  larvae 
  of 
  the 
  Platyptiliids. 
  At 
  this 
  time, 
  

   in 
  confinement, 
  the 
  larva 
  loves 
  to 
  bask 
  on 
  the 
  upperside 
  of 
  a 
  leaf, 
  

   coiling 
  itself 
  in 
  an 
  U-form, 
  or 
  stretched 
  at 
  full 
  length 
  (Tutt, 
  May 
  1st, 
  

   1904). 
  Final 
  instar 
  (fullgrown) 
  : 
  About 
  13mm. 
  long, 
  l*6mm. 
  wide 
  at 
  

   broadest 
  part, 
  viz., 
  across 
  meso- 
  and 
  metathoracic 
  segments, 
  the 
  body 
  

   tapering 
  rapidly 
  from 
  here 
  to 
  head, 
  and 
  very 
  gradually 
  to 
  anus, 
  which 
  

   is 
  usually 
  blunt 
  and 
  rather 
  square-ended. 
  The 
  larva 
  is, 
  on 
  the 
  whole, 
  

   cylindrical 
  and 
  even 
  in 
  thickness, 
  i.e., 
  the 
  divisions 
  of 
  the 
  segments, 
  

   though 
  clear 
  and 
  well-marked, 
  are 
  not 
  deep, 
  and 
  the 
  segments 
  do 
  not 
  

   swell 
  out 
  in 
  the 
  centre 
  as 
  is 
  often 
  the 
  case 
  (e.g., 
  in 
  Arctiid 
  larvae). 
  The 
  

   larva 
  as 
  a 
  whole 
  is 
  bright 
  green 
  (apple 
  -green) 
  in 
  tint, 
  very 
  closely 
  

   resembling 
  the 
  leaves 
  of 
  its 
  foodplant. 
  It 
  has 
  a 
  broad, 
  but 
  rather 
  faint, 
  

   paler 
  lateral 
  stripe, 
  placed 
  rather 
  high 
  up 
  its 
  sides, 
  and 
  a 
  faintly-marked 
  

   dark 
  mediodorsal 
  line. 
  The 
  skin 
  is 
  speckled 
  and 
  looks 
  shagreened 
  

   like 
  that 
  of 
  an 
  Amorphid 
  larva. 
  The 
  short 
  dorsal 
  horn 
  on 
  the 
  9th 
  

   abdominal 
  (not 
  8th), 
  and 
  the 
  pair 
  of 
  small 
  dorsal 
  projections 
  on 
  

   prothorax 
  are 
  tinged 
  with 
  red. 
  The 
  spiracles 
  are 
  small, 
  placed 
  on 
  a 
  

   brown 
  elevated 
  chitinous 
  button, 
  and 
  are 
  situated 
  just 
  above 
  lateral 
  

   band 
  very 
  high 
  up 
  the 
  sides, 
  almost 
  at 
  the 
  subdorsal 
  area. 
  The 
  legs 
  

   are 
  short 
  and 
  small, 
  very 
  pale 
  brown 
  at 
  the 
  horny 
  joints, 
  but 
  so 
  pale 
  

   as 
  not 
  to 
  contrast 
  sharply 
  with 
  the 
  green 
  of 
  the 
  sides. 
  The 
  head 
  is 
  

   small, 
  rounded, 
  but 
  deep 
  from 
  crown 
  to 
  mouth, 
  and 
  forms 
  in 
  outline 
  

   a 
  broad, 
  flat-sided 
  oval. 
  At 
  rest, 
  it 
  is 
  rather 
  retracted 
  and 
  hidden 
  by 
  

   prothorax, 
  which 
  is 
  much 
  larger 
  than 
  the 
  head, 
  and 
  projects 
  forward 
  

   over 
  it 
  like 
  a 
  hood 
  or 
  cowl. 
  At 
  rest, 
  the 
  crown 
  of 
  the 
  head 
  is 
  much 
  

   anterior 
  to 
  the 
  mouth, 
  which 
  is 
  drawn 
  close 
  in 
  to 
  the 
  first 
  pair 
  of 
  legs, 
  

   the 
  face 
  being 
  subventral 
  (reminding 
  one 
  of 
  Poulton's 
  drawing 
  of 
  the 
  

   larva 
  of 
  Ar/lia 
  tan). 
  Antennae 
  rather 
  noticeable 
  ; 
  the 
  division 
  of 
  lobes 
  

   of 
  the 
  head 
  distinct 
  ; 
  the 
  clypeus 
  small, 
  and 
  not 
  extending 
  more 
  than 
  

   about 
  half-way 
  from 
  mouth 
  to 
  crown 
  ; 
  the 
  surface 
  of 
  the 
  head 
  rather 
  

   rough, 
  with 
  scattered 
  hairs, 
  a 
  few 
  of 
  those 
  nearer 
  to 
  the 
  face 
  are 
  

   tapering, 
  those 
  higher 
  up 
  nearer 
  the 
  crown 
  tend 
  towards 
  being 
  club- 
  

   shaped 
  (? 
  glandular), 
  all 
  rather 
  short; 
  the 
  head 
  is 
  slightly 
  darker 
  towards 
  

   the 
  crown 
  on 
  its 
  sides 
  and 
  angles 
  ; 
  the 
  ocelli 
  very 
  distinct, 
  black 
  in 
  

   colour, 
  all 
  six 
  in 
  a 
  small 
  group 
  (rather 
  compact) 
  ; 
  there 
  are 
  a 
  few 
  small 
  

   shagreen-like 
  spots 
  on 
  head. 
  The 
  prothorax 
  small, 
  compared 
  with 
  

   the 
  meso- 
  and 
  metathorax, 
  much 
  longer 
  dorsally 
  than 
  ventrally, 
  where 
  it 
  

   is 
  merely 
  a 
  narrow 
  strip, 
  consequently 
  it 
  overhangs 
  and 
  produces 
  the 
  

   hooded 
  appearance 
  ; 
  on 
  the 
  anterior 
  edge 
  of 
  prothorax 
  there 
  are 
  two 
  

   cone-shaped 
  tubercular 
  projections, 
  one 
  on 
  either 
  side 
  of 
  median 
  line 
  ; 
  

   these 
  are 
  reddish-tinged 
  towards 
  the 
  top, 
  and 
  bear 
  a 
  short 
  glandular 
  

   hair 
  at 
  the 
  summit. 
  The 
  9th 
  abdominal 
  segment, 
  which 
  is 
  now 
  not 
  

  

  