﻿244 
  

  

  BRITISH 
  LEPIDOPTERA. 
  

  

  apart, 
  ii 
  being 
  the 
  larger, 
  a 
  subsegmental 
  division 
  coming 
  between 
  

   them 
  ; 
  iii 
  is 
  directly 
  above 
  the 
  spiracle 
  ; 
  the 
  prespiracular 
  point 
  has, 
  

   for 
  it, 
  a 
  large 
  and 
  distinct 
  plate 
  at 
  its 
  base, 
  and 
  is 
  rather 
  higher 
  than 
  

   usual. 
  Below 
  the 
  spiracle, 
  iv 
  and 
  v 
  are 
  situated 
  close 
  together, 
  v 
  a 
  

   little 
  above 
  iv; 
  both 
  are 
  rather 
  small 
  ; 
  there 
  is 
  a 
  triangular 
  group 
  of 
  

   three 
  hairs 
  well 
  below 
  iv 
  and 
  v, 
  a 
  large 
  posterior 
  and 
  two 
  small 
  

   anteriors 
  ; 
  these 
  may 
  represent 
  vi 
  and 
  another 
  subprimary 
  tubercle 
  ; 
  

   below 
  these, 
  again, 
  is 
  another 
  group 
  of 
  three, 
  probably 
  the 
  basal 
  group 
  

   vii. 
  The 
  spiracles 
  are 
  large, 
  with 
  broad 
  flat 
  black 
  rims 
  ; 
  as 
  usual, 
  those 
  

   on 
  the 
  prothorax 
  and 
  8th 
  abdominal 
  segment 
  are 
  larger 
  than 
  the 
  others 
  

   (Bacot). 
  Final 
  instar 
  (nearly 
  fullfed, 
  May 
  18th, 
  1904): 
  Stout, 
  short, 
  

   about 
  11mm. 
  long, 
  2mm. 
  wide 
  (reminding 
  one 
  much 
  of 
  the 
  larva 
  of 
  P. 
  

   gonodactyla) 
  ; 
  green, 
  with 
  no 
  pink 
  tinge, 
  of 
  a 
  dull 
  sage-green 
  tint 
  with 
  

   white 
  bands, 
  looking 
  as 
  if 
  enamelled 
  ; 
  these 
  are 
  (1) 
  a 
  broad 
  subdorsal 
  

   band 
  (with 
  i 
  and 
  ii); 
  (2) 
  a 
  narrow 
  lower 
  one 
  above, 
  but 
  almost 
  including, 
  

   iii 
  ; 
  and 
  (3) 
  a 
  lateral 
  one 
  below 
  spiracles 
  and 
  on 
  flange 
  ; 
  along 
  these 
  

   white 
  bands, 
  the 
  secondary 
  hairs 
  seem 
  absent; 
  really 
  they 
  are 
  colourless 
  

   on 
  these, 
  and 
  black 
  on 
  the 
  dark 
  areas 
  ; 
  the 
  tubercles 
  are 
  small, 
  with 
  

   single, 
  short, 
  black 
  hairs 
  ; 
  the 
  prolegs 
  on 
  short 
  props 
  (Chapman). 
  

   Another 
  spun 
  up 
  for 
  pupation 
  (May 
  22nd, 
  1904) 
  : 
  Length 
  12-5mm., 
  the 
  

   greatest 
  width 
  about 
  2-75mm.; 
  segments 
  strongly 
  marked, 
  swollen, 
  but 
  

   subsegments 
  not 
  at 
  all 
  distinct. 
  In 
  shape, 
  the 
  body 
  is 
  cylindrical, 
  and 
  

   tapers 
  very 
  gradually 
  towards 
  either 
  end, 
  the 
  tapering 
  only 
  becoming 
  

   noticeable 
  at 
  mesothorax 
  and 
  6th 
  abdominal 
  segment. 
  The 
  prothorax 
  

   small 
  (head 
  not 
  visible 
  in 
  this 
  position) 
  ; 
  anus 
  bluntly 
  pointed 
  ; 
  the 
  

   mesothorax 
  large 
  and 
  long 
  in 
  comparison, 
  but 
  both 
  the 
  metathorax 
  

   and 
  1st 
  abdominal 
  short 
  ; 
  the 
  3rd, 
  4th, 
  5th, 
  6th, 
  and 
  7th 
  abdominals 
  

   fairly 
  long; 
  they 
  then 
  tail 
  off, 
  both 
  as 
  regards 
  girth 
  and 
  length. 
  

   Colour 
  very 
  different 
  from 
  that 
  of 
  last 
  instar; 
  the 
  skin 
  appears 
  smooth 
  and 
  

   shining, 
  of 
  a 
  bright 
  but 
  pale 
  green, 
  with 
  a 
  white 
  dorsal 
  area, 
  and 
  clear 
  

   green 
  mediodorsal 
  stripe 
  ; 
  there 
  is 
  also 
  a 
  broad 
  and 
  strongly 
  developed 
  

   white 
  lateral 
  band. 
  The 
  prothoracic 
  plate 
  well 
  marked, 
  but 
  coloured 
  

   much 
  the 
  same 
  as 
  the 
  rest 
  of 
  the 
  body 
  ; 
  the 
  anal 
  plate 
  not 
  so 
  distinct. 
  

   The 
  head 
  is 
  still 
  pale, 
  with 
  black 
  ocelli; 
  the 
  true 
  legs 
  and 
  prolegs 
  pale- 
  

   coloured; 
  both 
  spicules 
  and 
  secondary 
  hairs 
  present, 
  and, 
  as 
  in 
  the 
  

   earlier 
  instar, 
  the 
  latter 
  are 
  dark, 
  with 
  dark 
  bases, 
  on 
  the 
  green 
  areas, 
  

   but 
  pale, 
  and 
  almost 
  colourless, 
  on 
  the 
  white 
  stripes. 
  The 
  primary 
  hairs 
  

   are 
  long 
  and 
  tapering, 
  with 
  small 
  black 
  buttons 
  at 
  bases. 
  There 
  is 
  no 
  

   trace 
  of 
  any 
  accessory 
  hair 
  behind 
  spiracle 
  (Bacot). 
  

  

  Variation 
  in 
  colour 
  according 
  to 
  age 
  of 
  larvje. 
  — 
  The 
  larva 
  is 
  of 
  the 
  

   usual 
  Alucitid 
  form, 
  though, 
  perhaps, 
  a 
  little 
  more 
  slender 
  than 
  in 
  some 
  

   species; 
  body 
  cylindrical, 
  stoutest 
  in 
  the 
  middle, 
  tapering 
  towards 
  the 
  

   extremities 
  ; 
  head 
  small 
  and 
  polished, 
  considerably 
  narrower 
  than 
  the 
  

   prothorax; 
  segmental 
  divisions 
  well-defined, 
  the 
  skin 
  rather 
  glossy. 
  

   When 
  about 
  a 
  quarter 
  of 
  an 
  inch 
  long, 
  the 
  ground 
  colour 
  is 
  pale 
  greyish- 
  

   olive, 
  but 
  this 
  is 
  almost 
  hidden 
  by 
  dark 
  purplish-brown 
  dorsal 
  and 
  

   subdorsal 
  stripes, 
  which 
  give 
  the 
  larva 
  a 
  very 
  dark 
  appearance 
  ; 
  head 
  

   very 
  pale 
  straw-colour, 
  marked 
  with 
  smoky-brown; 
  the 
  ocelli 
  black, 
  and 
  

   the 
  mandibles 
  reddish- 
  brown 
  ; 
  frontal 
  plate 
  and 
  anterior 
  legs 
  polished 
  

   black. 
  When 
  about 
  three 
  -eighths 
  of 
  an 
  inch 
  long, 
  it 
  has 
  become 
  consider- 
  

   ably 
  lighter 
  in 
  colour 
  ; 
  the 
  ground 
  colour 
  is 
  glaucous-green, 
  the 
  dorsal 
  

   and 
  subdorsal 
  stripes 
  purple, 
  but 
  more 
  interrupted 
  than, 
  and 
  not 
  so 
  wide 
  as, 
  

   in 
  the 
  earlier 
  stage 
  ; 
  head 
  of 
  the 
  same 
  pale 
  straw-colour, 
  but 
  not 
  so 
  much 
  

  

  