﻿AMBLYPTILIA 
  COSMODACTYLA. 
  283 
  

  

  on 
  the 
  prothorax, 
  the 
  tubercular 
  group 
  in 
  front 
  of 
  spiracle 
  appears 
  to 
  

   have 
  two 
  hairs, 
  but, 
  in 
  one 
  or 
  two 
  specimens, 
  a 
  very 
  minute 
  third 
  hair 
  

   is 
  detected, 
  so 
  that 
  probably 
  it 
  exists 
  in 
  all 
  ; 
  minute 
  hairs 
  in 
  these 
  small 
  

   larvae 
  easily 
  evade 
  observation, 
  and 
  require 
  a 
  very 
  good 
  light, 
  and 
  a 
  

   satisfactory 
  specimen, 
  if 
  they 
  are 
  not 
  to 
  be 
  missed. 
  The 
  prothoracic 
  

   plate 
  has 
  the 
  usual 
  three 
  hairs 
  in 
  front, 
  of 
  fairly 
  equal 
  size 
  and 
  spacing; 
  

   the 
  three 
  posterior 
  are 
  much 
  out 
  of 
  line, 
  the 
  middle 
  one 
  very 
  long, 
  and 
  

   placed 
  rather 
  back, 
  the 
  outer 
  one 
  very 
  small, 
  and 
  forwards 
  ; 
  the 
  usual 
  

   two 
  hairs 
  at 
  base 
  of 
  legs. 
  On 
  the 
  meso- 
  and 
  metathorax 
  the 
  usual 
  four 
  

   pairs 
  of 
  hairs 
  occur; 
  the 
  third 
  being, 
  however, 
  a 
  single 
  hair. 
  On 
  the 
  

   abdominal 
  segments, 
  vi 
  appears 
  not 
  to 
  be 
  present. 
  There 
  are 
  no 
  skin- 
  

   points 
  (September 
  1st, 
  1904). 
  Second 
  instar: 
  3mm. 
  in 
  length 
  when 
  full- 
  

   grown 
  ; 
  it 
  is 
  rather 
  narrow, 
  and 
  of 
  nearly 
  uniform 
  width. 
  Props 
  of 
  

   prolegs 
  rather 
  long, 
  with 
  four 
  crochets 
  in 
  one 
  specimen, 
  five 
  in 
  another. 
  

   Head 
  and 
  prothoracic 
  plate 
  black, 
  and 
  anal 
  plate 
  very 
  dark 
  ; 
  general 
  

   colour 
  yellowish-ochreous, 
  with 
  a 
  pale, 
  nearly 
  white, 
  stripe 
  in 
  line 
  of 
  i 
  

   and 
  ii, 
  another 
  along 
  iii, 
  and 
  a 
  set, 
  sloping 
  diagonally 
  downwards 
  and 
  

   forwards, 
  and 
  between 
  spiracles 
  and 
  iv 
  and 
  v 
  ; 
  legs 
  black 
  ; 
  tubercles 
  dark 
  ; 
  

   hairs 
  short; 
  vi 
  present; 
  skin-points 
  well-developed, 
  and 
  bearing 
  fine 
  needle- 
  

   like 
  points 
  ; 
  there 
  are, 
  on 
  each 
  side, 
  two 
  secondary 
  hairs, 
  one 
  behind 
  

   spiracle, 
  and 
  another 
  higher 
  up 
  above 
  this 
  ; 
  these 
  are 
  secondary 
  in 
  

   having 
  widened 
  ends 
  and 
  imperfectly 
  articulated 
  bases. 
  The 
  primary 
  

   hairs 
  are 
  smooth 
  and 
  pointed. 
  In 
  this 
  stage 
  there 
  is 
  often 
  a 
  good 
  deal 
  

   of 
  pink 
  tinting. 
  Third 
  instar: 
  Length 
  5mm. 
  Dirty 
  brown, 
  with 
  

   whitish 
  subdorsal 
  line, 
  and 
  a 
  lower 
  line 
  arched 
  on 
  each 
  segment, 
  also 
  

   whitish, 
  paler 
  below 
  vi 
  ; 
  head 
  black. 
  The 
  whole 
  larva 
  so 
  transparent, 
  

   and 
  so 
  much 
  of 
  its 
  colour 
  due 
  to 
  contents, 
  that 
  one 
  is 
  in 
  doubt 
  as 
  to 
  

   whether 
  the 
  markings 
  really 
  have 
  a 
  fixed 
  position 
  ; 
  legs 
  black 
  ; 
  prolegs 
  

   on 
  long 
  slender 
  transparent 
  props 
  ; 
  hairs 
  long, 
  especially 
  those 
  of 
  

   tubercle 
  ii, 
  about 
  0-3mm. 
  at 
  middle, 
  and 
  0'4mm. 
  at 
  the 
  extremities 
  of 
  

   the 
  larva. 
  The 
  larva 
  fairly 
  cylindrical, 
  but 
  tapering 
  gradually 
  from 
  

   about 
  1st 
  abdominal 
  segment 
  to 
  the 
  8th, 
  much 
  as 
  so 
  many 
  " 
  plume 
  " 
  larvae 
  

   do. 
  In 
  another 
  specimen 
  there 
  is 
  a 
  subspiracular 
  white 
  shade, 
  and 
  

   the 
  spiracular 
  one 
  looks 
  oblique, 
  but 
  the 
  subcutaneous 
  character 
  of 
  the 
  

   markings 
  makes 
  it 
  difficult 
  to 
  see 
  them 
  all 
  at 
  once, 
  as 
  they 
  disappear 
  

   at 
  the 
  front 
  or 
  back 
  of 
  segment, 
  or 
  elsewhere, 
  according 
  to 
  angle 
  of 
  

   view. 
  In 
  another 
  specimen, 
  on 
  Erica 
  tetrali.v, 
  the 
  subdorsal 
  white 
  line 
  

   is 
  very 
  broad, 
  and 
  trespasses 
  largely, 
  at 
  the 
  same 
  time 
  fading 
  out. 
  on 
  

   the 
  broad 
  darker 
  dorsal 
  band 
  ; 
  the 
  supraspiracular 
  line 
  is 
  very 
  plain 
  

   from 
  front 
  of 
  segment 
  to 
  iii, 
  then 
  stops 
  abruptly; 
  a 
  white 
  dot 
  behind 
  

   spiracle 
  (an 
  accessory 
  tubercle) 
  ; 
  below 
  vi 
  is 
  the 
  paler 
  undersurface 
  ; 
  

   the 
  posterior 
  segments 
  reddish, 
  the 
  rest 
  transparent, 
  and 
  showing 
  the 
  dark 
  

   intestinal 
  contents. 
  These 
  larvae, 
  feeding 
  externally, 
  jerk 
  the 
  faeces 
  away, 
  

   like 
  those 
  in 
  last 
  skin. 
  In 
  this 
  skin, 
  there 
  are 
  five 
  hooks 
  to 
  prolegs. 
  

   The 
  secondary 
  hairs 
  are 
  more 
  numerous 
  (about 
  nine 
  from 
  dorsal 
  line 
  

   to 
  level 
  of 
  spiracle), 
  thickened 
  at 
  each 
  end 
  (September 
  loth, 
  1904). 
  

   Fourth 
  instar 
  (newly-moulted) 
  : 
  Only 
  about 
  6mm. 
  long. 
  1 
  lead 
  fairly 
  Large, 
  

   with 
  the 
  adult 
  markings 
  (hitherto 
  entirely 
  black). 
  Otherwise 
  it 
  seems 
  

   identical 
  with 
  full-grown 
  larva, 
  so 
  that 
  this 
  seems 
  to 
  be 
  the 
  last 
  skin. 
  

   The 
  head 
  is 
  as 
  wide 
  as 
  the 
  larva; 
  the 
  fullfed 
  larva 
  has 
  a 
  comparatively 
  

   small 
  head 
  (September 
  10th, 
  1904). 
  Adult 
  larva: 
  [Two 
  larvae 
  of 
  two 
  

   different 
  varieties 
  found 
  on 
  Stachys 
  collected, 
  at 
  Gorfe 
  Castle, 
  as 
  food 
  

   for 
  other 
  larvae 
  being 
  reared 
  in 
  confinement.' 
  One 
  nearly 
  uniform 
  

  

  