﻿326 
  

  

  BRITISH 
  LEPIDOPTERA. 
  

  

  sides 
  at 
  about, 
  or 
  rather 
  above, 
  the 
  middle. 
  The 
  head 
  is 
  small, 
  

   rounded, 
  polished, 
  pale 
  brown 
  in 
  colour, 
  slightly 
  mottled 
  with 
  darker 
  

   on 
  the 
  cheeks 
  ; 
  it 
  bears 
  a 
  few 
  scattered, 
  and 
  rather 
  weak, 
  tapering, 
  

   hairs 
  ; 
  the 
  ocelli 
  situated 
  on 
  a 
  dark 
  patch. 
  The 
  prothorax 
  is 
  small, 
  

   and 
  the 
  first 
  pair 
  of 
  legs 
  appears 
  somewhat 
  weak 
  in 
  comparison 
  with 
  

   the 
  others 
  ; 
  the 
  scutellar 
  plate 
  is 
  not 
  conspicuously 
  coloured, 
  but 
  

   carries 
  some 
  black 
  spotting 
  on 
  its 
  posterior 
  dorsal 
  half, 
  bordering 
  the 
  

   median 
  line 
  ; 
  it 
  has 
  also 
  a 
  noticeable 
  feature 
  in 
  the 
  two 
  depressed 
  

   dark-coloured 
  spots, 
  situated 
  about 
  midway 
  between 
  the 
  mediodorsal 
  line 
  

   and 
  the 
  spiracles. 
  The 
  spiracles 
  are 
  not 
  highly 
  raised, 
  but 
  form 
  a 
  

   somewhat 
  conspicuous 
  feature, 
  as 
  they 
  are 
  rimmed 
  with 
  black. 
  The 
  

   skin 
  is 
  wrinkled, 
  but 
  the 
  subsegmentation 
  is 
  only 
  poorly 
  marked 
  ; 
  

   there 
  are 
  three 
  subsegments 
  on 
  the 
  meso- 
  and 
  metathorax, 
  and 
  four 
  

   on 
  the 
  abdominal 
  segments, 
  but 
  only 
  one 
  of 
  these 
  is 
  strongly 
  marked 
  

   dorsally, 
  and 
  this 
  is 
  the 
  one 
  that 
  is 
  normally 
  present 
  between 
  tubercles 
  

   i 
  and 
  ii. 
  The 
  skin 
  bears 
  a 
  thickly-set 
  coat 
  of 
  rather 
  coarse 
  skin-points, 
  

   or 
  short, 
  stout, 
  spicules, 
  but, 
  as 
  these 
  are 
  not 
  distinctively 
  coloured, 
  

   they 
  are 
  not 
  conspicuous. 
  There 
  is 
  some 
  variation 
  as 
  regards 
  

   coloration 
  among 
  the 
  larvae, 
  possibly 
  due 
  to 
  age, 
  the 
  larger 
  ones 
  being 
  

   of 
  a 
  more 
  vivid 
  green. 
  They 
  have 
  a 
  dark 
  mediodorsal 
  line, 
  the 
  dorsal 
  

   area 
  on 
  either 
  side 
  being 
  pale 
  olive-brown 
  ; 
  there 
  is 
  a 
  dark 
  subdorsal 
  

   line, 
  not. 
  however, 
  so 
  heavy 
  as 
  the 
  mediodorsal, 
  and 
  this 
  is 
  

   bordered 
  faintly 
  above, 
  and 
  more 
  strongly 
  beneath, 
  with 
  dull 
  white 
  ; 
  

   the 
  sublateral 
  and 
  ventral 
  areas 
  are 
  paler 
  and 
  brighter 
  green. 
  

   In 
  the 
  older 
  (better-grown), 
  larvae, 
  the 
  back 
  is 
  pale 
  and 
  brighter 
  

   green, 
  the 
  dorsal 
  stripe 
  is 
  paler 
  and 
  more 
  transparent-looking, 
  

   whilst 
  the 
  upper 
  white 
  border 
  to 
  the 
  subdorsal 
  stripe 
  is 
  much 
  

   stronger, 
  but, 
  below, 
  becomes 
  a 
  narrower 
  and 
  irregular 
  broken 
  line 
  ; 
  

   there 
  is 
  also 
  a 
  narrow, 
  white, 
  lateral 
  line, 
  w 
  r 
  hich 
  I 
  cannot 
  trace 
  in 
  the 
  

   younger 
  larvae. 
  When 
  the 
  larva 
  is 
  feeding, 
  and 
  in 
  positions 
  of 
  stress, 
  

   the 
  muscular 
  band 
  beneath 
  the 
  spiracles 
  is 
  rendered 
  conspicuous, 
  

   suggesting 
  a 
  lateral 
  flange, 
  which 
  disappears 
  when 
  at 
  rest. 
  The 
  

   tubercles 
  are 
  small, 
  low 
  r 
  , 
  skin-elevations, 
  hardly 
  warts 
  (and 
  can 
  only 
  be 
  

   so 
  termed 
  in 
  a 
  very 
  loose 
  sense) 
  ; 
  they 
  are, 
  however, 
  distinctly 
  removed 
  

   from 
  the 
  single-haired 
  primitive 
  stage, 
  the 
  allowance 
  being 
  one 
  

   additional 
  hair 
  for 
  i, 
  ii, 
  and 
  iii, 
  but 
  not 
  for 
  iv 
  and 
  v. 
  There 
  may 
  also 
  

   be 
  another 
  very 
  small 
  dark-coloured 
  bristle-like 
  hair 
  associated 
  with 
  i 
  

   and 
  ii, 
  but 
  not 
  with 
  iii. 
  In 
  addition 
  to 
  these, 
  there 
  are 
  a 
  few 
  scattered 
  

   skin-surface 
  hairs, 
  and 
  these 
  are 
  dark-coloured, 
  and 
  very 
  short 
  and 
  

   bristle-like, 
  w 
  r 
  ith 
  knobbed 
  tips, 
  the 
  greater 
  number 
  arranged 
  in 
  

   proximity 
  to 
  the 
  mediodorsal 
  line. 
  The 
  primary 
  hairs 
  are 
  stout, 
  

   tapering, 
  curved, 
  and 
  slightly 
  knobbed 
  at 
  the 
  tips, 
  and 
  minutely 
  

   thorned 
  or 
  serrated. 
  On 
  the 
  meso- 
  and 
  metathorax, 
  i 
  and 
  ii 
  are 
  con- 
  

   joined 
  at 
  the 
  base, 
  the 
  lower 
  group, 
  iii 
  and 
  iv, 
  being 
  two 
  hairs 
  on 
  a 
  

   conjoined 
  base 
  ; 
  the 
  subprimary 
  is 
  a 
  single 
  hair, 
  and 
  v 
  and 
  vi 
  a 
  double- 
  

   haired 
  tubercle 
  posterior 
  to 
  it, 
  with 
  another 
  double 
  hair, 
  vii, 
  beneath. 
  

   On 
  the 
  abdominals, 
  i 
  and 
  ii 
  are 
  widely 
  separated, 
  but 
  nearly 
  in 
  line 
  

   with 
  one 
  another, 
  iii 
  well 
  down 
  towards 
  the 
  spiracle, 
  iv 
  and 
  v 
  with 
  

   bases 
  on 
  the 
  same 
  raised 
  skin-area, 
  but 
  with 
  actual 
  hair-bases 
  apart, 
  

   perhaps 
  rather 
  further 
  so 
  than 
  is 
  normal. 
  Although 
  there 
  is 
  no 
  

   postspiracular 
  accessory 
  tubercle 
  present, 
  there 
  appear 
  to 
  me 
  to 
  

   be 
  indications 
  that 
  the 
  lower, 
  and 
  perhaps 
  also 
  the 
  upper, 
  will 
  be 
  

   developed 
  in 
  the 
  next 
  skin 
  (Bacot, 
  July 
  7th, 
  1904). 
  Final 
  instar 
  (full- 
  

  

  