﻿192 
  

  

  BKITISH 
  LEPIDOPTERA. 
  

  

  4 
  below 
  iv, 
  none 
  dorsally, 
  or 
  on 
  the 
  9th 
  or 
  10th 
  abdominals. 
  On 
  

   another 
  specimen 
  they 
  are 
  much 
  more 
  numerous, 
  the 
  8th 
  abdominal 
  

   having 
  2 
  or 
  3 
  dorsally 
  and 
  10 
  lower, 
  and 
  on 
  the 
  mesothorax, 
  instead 
  

   of 
  37 
  are 
  180 
  or 
  so, 
  on 
  either 
  side. 
  The 
  prolegs 
  have 
  10 
  or 
  12 
  hooks, 
  

   varying 
  even 
  on 
  the 
  two 
  sides 
  of 
  one 
  specimen. 
  The 
  spiracles 
  are 
  tall 
  

   and 
  thimble-shaped. 
  The 
  prothoracic 
  plate 
  (and 
  head) 
  is 
  black 
  with 
  

   the 
  usual 
  6 
  hairs 
  and 
  dark 
  mark 
  ; 
  3 
  prespiracular 
  hairs 
  on 
  one 
  plate 
  

   and 
  2 
  at 
  base 
  of 
  legs, 
  also 
  on 
  one 
  plate. 
  On 
  the 
  meso- 
  and 
  metathorax 
  

   the 
  first 
  and 
  last 
  pairs 
  of 
  tubercular 
  hairs 
  are 
  on 
  just 
  separate 
  plates, 
  

   the 
  two 
  intermediate 
  ones 
  on 
  conjoined 
  plates 
  ; 
  above 
  and 
  behind 
  the 
  

   third 
  pair 
  is 
  a 
  small 
  hair. 
  On 
  the 
  abdomen, 
  tubercles 
  iv 
  and 
  v 
  are 
  on 
  

   one 
  plate, 
  the 
  others 
  as 
  well 
  separated 
  as 
  in 
  the 
  second 
  instar; 
  on 
  the 
  

   1st 
  abdominal 
  vii 
  carries 
  a 
  single 
  hair, 
  and 
  there 
  is 
  another 
  near 
  the 
  

   middle 
  line 
  (viii 
  ?). 
  On 
  the 
  9th 
  abdominal 
  are, 
  consecutively, 
  3 
  

   plates, 
  each 
  with 
  2 
  hairs 
  arranged 
  trapezoidally, 
  and 
  then 
  2 
  hairs 
  

   singly. 
  The 
  large 
  black 
  anal 
  plate 
  has 
  9 
  or 
  10 
  hairs 
  on 
  either 
  side. 
  

   The 
  plates 
  carrying 
  the 
  hairs 
  are 
  of 
  a 
  beautiful 
  tessellated 
  pattern. 
  

   In 
  one 
  specimen 
  (from 
  Spain) 
  the 
  hairs 
  on 
  iv 
  are 
  curiously 
  malformed, 
  

   being 
  bent 
  and 
  twisted, 
  enlarged 
  and 
  flattened 
  out, 
  etc. 
  One, 
  for 
  

   example, 
  near 
  the 
  base, 
  is 
  flattened 
  and 
  bent 
  as 
  if 
  it 
  had 
  been 
  pinched, 
  

   then 
  further 
  on 
  it 
  is 
  flattened 
  out 
  into 
  a 
  plate 
  with 
  serrated 
  edge, 
  and 
  

   a 
  median 
  one 
  of 
  the 
  serrations 
  is 
  continued 
  as 
  a 
  fine 
  termination 
  of 
  

   the 
  hair. 
  The 
  others 
  have 
  peculiarities 
  of 
  the 
  same 
  character. 
  I 
  

   find 
  in 
  one 
  or 
  two 
  of 
  the 
  English 
  specimens 
  some 
  trace 
  of 
  a 
  similar 
  

   peculiarity 
  of 
  this 
  same 
  hair. 
  The 
  quasi-skin 
  hairs 
  are 
  really 
  skin- 
  

   points, 
  i.e., 
  they 
  are 
  not 
  jointed 
  at 
  the 
  base, 
  and, 
  except 
  for 
  size, 
  have 
  

   the 
  same 
  simple 
  structure 
  as 
  the 
  skin-points. 
  They 
  only 
  appear 
  in 
  

   Platijptilia 
  isodactylm 
  in 
  the 
  last 
  instar 
  (not 
  at 
  all 
  in 
  Fredericina 
  

   calodactyla 
  \zettentedtii\) 
  (Chapman). 
  Fullgrown 
  : 
  Three-eighths 
  of 
  

   an 
  inch 
  in 
  length, 
  rather 
  thick 
  and 
  plump, 
  tapering 
  much 
  just 
  at 
  each 
  

   end, 
  the 
  head 
  small, 
  the 
  legs 
  short 
  and 
  placed 
  much 
  under 
  the 
  body, 
  

   the 
  skin 
  smooth, 
  shining 
  and 
  pellucid; 
  it 
  is 
  of 
  a 
  watery, 
  greenish 
  tint, 
  

   showing 
  a 
  dark, 
  greenish, 
  dorsal 
  vessel 
  ; 
  the 
  subdorsal 
  stripe 
  is 
  also 
  

   darker 
  green 
  than 
  the 
  ground-colour, 
  and 
  this 
  is 
  bordered 
  above 
  by 
  an 
  

   opaque 
  whitish 
  stripe, 
  which 
  lies 
  beneath 
  the 
  skin, 
  and 
  shows 
  partially 
  

   through 
  its 
  glossy 
  surface 
  ; 
  another 
  such 
  faint 
  whitish 
  stripe 
  shows 
  

   through 
  along 
  the 
  side, 
  and 
  below 
  that 
  is 
  another, 
  somewhat 
  inflated, 
  

   on 
  which 
  are 
  the 
  spiracles 
  ; 
  the 
  head 
  is 
  black, 
  and 
  so 
  also 
  is 
  a 
  narrow 
  

   plate 
  across 
  the 
  middle 
  of 
  the 
  back 
  of 
  the 
  second 
  segment, 
  which 
  is 
  

   divided 
  in 
  the 
  centre 
  by 
  a 
  thin 
  line 
  of 
  the 
  pale 
  ground-colour 
  ; 
  the 
  

   anterior 
  legs 
  are 
  black 
  ; 
  the 
  tubercular 
  dots 
  above 
  are 
  small 
  and 
  black, 
  

   those 
  along 
  the 
  spiracular 
  region 
  are 
  rather 
  larger, 
  and 
  those 
  on 
  the 
  

   front 
  part 
  of 
  the 
  13th 
  segment 
  are 
  very 
  much 
  larger 
  still 
  ; 
  a 
  black 
  plate 
  

   is 
  on 
  the 
  anal 
  flap 
  ; 
  it 
  is 
  noteworthy 
  that 
  each 
  tubercular 
  dot 
  has, 
  in 
  

   this 
  species, 
  but 
  a 
  single 
  hair 
  (Buckler). 
  Buckler 
  figured 
  {Larvae, 
  etc., 
  

   pi. 
  clxiii., 
  figs. 
  4-4a) 
  two 
  larvae 
  of 
  this 
  species 
  in 
  different 
  stages 
  of 
  

   growth, 
  and 
  very 
  differently 
  coloured, 
  viz., 
  fig. 
  4 
  green, 
  fig. 
  4a 
  brownish, 
  

   together 
  with 
  an 
  enlarged 
  view 
  (fig. 
  4c) 
  of 
  one 
  of 
  the 
  abdominal 
  

   segments 
  showing 
  the 
  tubercles, 
  on 
  August 
  16th, 
  1871, 
  and 
  May 
  18th, 
  

   1872. 
  

  

  Seasonal 
  variation 
  of 
  larva. 
  — 
  Buckler 
  states 
  [Larvae, 
  etc., 
  ix., 
  

   p. 
  346) 
  that, 
  on 
  May 
  18th, 
  1872, 
  he 
  figured 
  larvae 
  from 
  Norfolk, 
  

   mining 
  the 
  stems 
  of 
  Senecio 
  aquaticus. 
  These 
  larvae, 
  he 
  says, 
  were 
  finer 
  

  

  