﻿508 
  

  

  BRITISH 
  LEPIDOPTERA. 
  

  

  0-13mm. 
  ; 
  hairs 
  on 
  ii, 
  iii, 
  and 
  iv, 
  on 
  abdominal 
  segments 
  about 
  04mm. 
  

   Points 
  of 
  hairs 
  white, 
  and 
  apparently 
  clubbed. 
  Towards 
  moult, 
  shows 
  

   some 
  reddish 
  tinting 
  between 
  the 
  tubercles. 
  Second 
  instar 
  : 
  2mm. 
  

   long 
  ; 
  hairs 
  white, 
  arising 
  from 
  black 
  points, 
  more 
  clubbed 
  and 
  pro- 
  

   portionally 
  shorter 
  than 
  in 
  first 
  skin. 
  No 
  secondary 
  hairs. 
  The 
  

   tubercles 
  are 
  on 
  distinct 
  largish 
  plates 
  of 
  a 
  faint 
  cinereous 
  tint, 
  and 
  

   round 
  them 
  is 
  a 
  whitish 
  shade, 
  as 
  of 
  a 
  porcellanous-white 
  thickening 
  of 
  

   the 
  skin 
  ; 
  the 
  rest 
  is 
  a 
  pale 
  brownish-red, 
  forming 
  a 
  dorsal 
  band, 
  a 
  line 
  

   along 
  the 
  posterior 
  border 
  of 
  each 
  segment 
  giving 
  a 
  branch 
  forward 
  

   (and 
  obliquely 
  upwards) 
  between 
  ii 
  and 
  iii, 
  and 
  between 
  iii 
  and 
  spiracle. 
  

   There 
  is, 
  however, 
  some 
  variation 
  in 
  tint 
  and 
  extent 
  of 
  red 
  marking, 
  

   either 
  in 
  different 
  specimens, 
  or 
  according 
  to 
  different 
  degrees 
  of 
  maturity. 
  

   The 
  central 
  hair 
  on 
  the 
  head 
  is 
  still 
  long. 
  The 
  first 
  and 
  third 
  

   posterior 
  hairs 
  of 
  thoracic 
  plate 
  are 
  very 
  short 
  compared 
  with 
  the 
  

   long 
  second 
  one, 
  the 
  outer 
  one 
  of 
  the 
  front 
  row 
  is 
  also 
  long. 
  The 
  

   prothoracic 
  plate 
  is 
  paler, 
  with 
  dark 
  marbling 
  on 
  each 
  side 
  of 
  the 
  

   central 
  suture, 
  and 
  the 
  dark 
  spot 
  between 
  the 
  second 
  and 
  third 
  hairs 
  is 
  

   distinct, 
  rather 
  nearer 
  the 
  posterior 
  margin 
  of 
  the 
  plate. 
  The 
  prespira- 
  

   cular 
  tubercle 
  has 
  three 
  hairs, 
  and 
  there 
  are 
  three 
  hairs 
  on 
  the 
  third 
  

   tubercle 
  of 
  the 
  meso- 
  and 
  metathorax 
  ; 
  i 
  on 
  the 
  9th 
  abdominal 
  is 
  very 
  

   small, 
  but 
  is 
  quite 
  visible. 
  The 
  anal 
  plate 
  carries 
  six 
  hairs 
  on 
  either 
  

   side. 
  The 
  spiracles 
  are 
  black, 
  but 
  not 
  very 
  large 
  or 
  prominent. 
  Third 
  

   instar: 
  3*5mm. 
  long, 
  before 
  feeding 
  much 
  ; 
  it 
  has 
  now 
  quite 
  the 
  adult 
  

   "plumage," 
  though 
  the 
  secondary 
  hairs 
  are 
  fewer 
  and 
  much 
  smaller 
  

   than 
  in 
  the 
  final 
  instar. 
  The 
  tubercles 
  are 
  on, 
  or 
  rather 
  form, 
  almost 
  

   raised 
  humps. 
  The 
  secondary 
  hairs 
  are, 
  four 
  on 
  i-f 
  ii, 
  two 
  or 
  three 
  of 
  

   them 
  very 
  small 
  and 
  inconspicuous, 
  one 
  on 
  iii, 
  none 
  on 
  iv+v, 
  or 
  on 
  

   vi. 
  These 
  secondary 
  hairs 
  are 
  white, 
  and 
  clubbed. 
  The 
  primaries 
  

   arise 
  from 
  black 
  points, 
  are 
  ochreous, 
  with 
  white 
  clubbed 
  tips. 
  The 
  

   skin-points, 
  wanting 
  in 
  the 
  first 
  instar, 
  transparent 
  and 
  sparse 
  in 
  the 
  

   second, 
  are 
  now 
  abundant. 
  The 
  tubercular 
  areas 
  are 
  free 
  from 
  them, 
  

   these 
  areas, 
  which 
  probably 
  correspond 
  with 
  the 
  earlier 
  tinted 
  scuta 
  which 
  

   are 
  not 
  present 
  now, 
  have 
  a 
  little 
  differentiation 
  of 
  colour, 
  and 
  texture, 
  

   to 
  mark 
  them 
  off 
  from 
  the 
  surrounding 
  skin. 
  The 
  larva 
  is 
  still 
  very 
  

   transparent 
  and 
  flimsy-looking. 
  The 
  white, 
  under 
  the 
  tubercles, 
  

   seems 
  subcutaneous, 
  as 
  does 
  also 
  the 
  red-brown 
  of 
  the 
  dorsal 
  stripe, 
  

   and 
  of 
  a 
  great 
  part 
  of 
  the 
  rest 
  of 
  the 
  larva. 
  The 
  red 
  is, 
  however, 
  in 
  

   marks 
  or 
  marblings, 
  and 
  not 
  in 
  continuous 
  streaks. 
  The 
  two 
  hairs 
  

   on 
  the 
  head 
  and 
  on 
  the 
  mesothorax 
  are 
  long, 
  but 
  only 
  a 
  little 
  longer 
  

   than 
  the 
  longer 
  ones 
  on 
  the 
  abdomen. 
  The 
  longer 
  hairs 
  are 
  from 
  

   O^mm. 
  to 
  0'4mm. 
  long, 
  not 
  quite 
  three 
  times 
  as 
  long 
  as 
  the 
  others, 
  as 
  

   in 
  previous 
  instar. 
  The 
  prolegs 
  are 
  long 
  props, 
  slightly 
  bulbed 
  at 
  the 
  

   end, 
  and 
  with 
  seven 
  dark 
  crochets 
  round 
  the 
  inner 
  margin. 
  The 
  six 
  

   eyespots 
  are 
  very 
  prominent, 
  more 
  than 
  hemispheres. 
  The 
  head 
  is 
  

   translucent, 
  with 
  ochreous 
  marblings. 
  A 
  large 
  black 
  mark 
  under 
  

   the 
  eyespots, 
  but 
  three 
  of 
  them 
  escape 
  it, 
  or 
  seem 
  to 
  do 
  so, 
  at 
  certain 
  

   angles, 
  and 
  look 
  quite 
  white. 
  There 
  is 
  a 
  short 
  hair, 
  ventrally, 
  close 
  to 
  

   the 
  middle 
  line 
  on 
  the 
  abdominal 
  segments 
  without 
  prolegs, 
  probably 
  

   present 
  in 
  other 
  instars, 
  though 
  not 
  noted. 
  The 
  last 
  joint 
  of 
  the 
  true 
  

   legs 
  is 
  markedly 
  long 
  and 
  slender 
  (Chapman). 
  

  

  Foodplant. 
  — 
  Drosera 
  rotundifolia 
  (Bankes). 
  The 
  foodplant, 
  Drosera 
  

   rotundifolia 
  (and 
  probably 
  the 
  other 
  forms 
  ; 
  I 
  found 
  many 
  larvae 
  on 
  D. 
  

   rotundifolia, 
  but 
  the 
  Dorset 
  plants 
  varied 
  somewhat 
  towards 
  intermedia), 
  

  

  