﻿PLATYPTILIA 
  ISODACTYLUS. 
  197 
  

  

  thorax, 
  but 
  are 
  still 
  traceable 
  down 
  to 
  tubercle 
  i 
  on 
  the 
  3rd 
  abdominal 
  

   segment 
  ; 
  the 
  hindwing 
  disappears 
  just 
  beyond 
  the 
  spiracle 
  of 
  the 
  

   2nd 
  abdominal 
  segment. 
  The 
  forewing 
  shows 
  marks 
  of 
  veins, 
  and 
  also 
  

   exhibits 
  " 
  Poulton's 
  line," 
  giving 
  a 
  wide 
  inner- 
  and 
  hind-margin, 
  slightly 
  

   passing 
  as 
  an 
  angle 
  between 
  the 
  two 
  lobes, 
  and 
  cutting 
  off 
  the 
  long 
  

   wing 
  apex, 
  so 
  that 
  the 
  portion 
  inside 
  the 
  line 
  hardly 
  intrudes 
  into 
  it 
  at 
  

   all 
  ; 
  the 
  slit 
  between 
  the 
  lobes 
  has 
  paler 
  chitin, 
  with 
  quite 
  a 
  large 
  pale 
  

   patch 
  at 
  the 
  point 
  of 
  fission 
  (Chapman). 
  The 
  pupa 
  is 
  figured 
  by- 
  

   Buckler 
  (Larvae, 
  etc., 
  pi. 
  clxiii., 
  fig. 
  46), 
  and 
  is 
  of 
  a 
  very 
  dark 
  grey 
  

   colour, 
  differing 
  considerably 
  from 
  his 
  description 
  of 
  the 
  same 
  (infra). 
  

   Colour 
  variation 
  and 
  markings 
  of 
  pupa. 
  — 
  The 
  pupa 
  is 
  smooth*, 
  

   nearly 
  -375 
  in. 
  in 
  length 
  ; 
  the 
  wings 
  and 
  leg-cases 
  meeting 
  in 
  a 
  point 
  

   low 
  down 
  the 
  abdomen, 
  and 
  in 
  close 
  contact 
  with 
  it 
  ; 
  in 
  colour, 
  it 
  is 
  

   pale 
  whitish-ochreous, 
  the 
  abdomen 
  a 
  little 
  deeper 
  tinted, 
  it 
  is 
  

   generally 
  striped 
  and 
  marked 
  with 
  brown, 
  particularly 
  on 
  the 
  head 
  

   and 
  back 
  of 
  the 
  thorax; 
  the 
  dorsal 
  marking 
  is 
  a 
  series 
  of 
  brown 
  acute 
  

   triangles 
  (Buckler). 
  The 
  spring 
  pupae 
  are, 
  as 
  a 
  rule, 
  much 
  darker 
  

   than 
  would 
  agree 
  with 
  Buckler's 
  description 
  of 
  the 
  internal 
  summer 
  

   pupa; 
  probably, 
  I 
  have 
  not 
  examples 
  of 
  the 
  palest 
  of 
  the 
  spring 
  

   forms, 
  but 
  my 
  palest 
  are 
  darker 
  than 
  Buckler's, 
  whilst 
  two 
  are 
  absolutely 
  

   black, 
  but 
  with 
  a 
  fine 
  " 
  bloom 
  " 
  giving 
  a 
  bluish 
  effect, 
  one 
  of 
  the 
  black 
  

   ones 
  must 
  have 
  the 
  word 
  " 
  absolutely 
  " 
  modified, 
  to 
  admit 
  of 
  a 
  faint 
  

   trace 
  of 
  a 
  paler 
  subdorsal 
  line 
  being 
  represented 
  by 
  brown 
  spots 
  faintly 
  

   indicated 
  on 
  each 
  segment 
  at 
  the 
  ridge 
  which 
  encircles 
  each 
  segment. 
  

   Barrett 
  can 
  hardly 
  be 
  correct 
  in 
  finding 
  no 
  cremastral 
  attachment; 
  it 
  is 
  

   represented 
  in 
  the 
  summer 
  form, 
  in 
  all 
  the 
  specimens 
  examined, 
  exactly 
  

   as 
  it 
  exists 
  in 
  the 
  spring 
  one 
  ; 
  the 
  pupa 
  is 
  easily 
  drawn 
  out 
  of 
  the 
  cocoon, 
  

   but 
  brings 
  a 
  thread 
  or 
  two 
  of 
  silk 
  with 
  it. 
  Some 
  pale 
  pupa? 
  would 
  be 
  

   best 
  described 
  as 
  black, 
  w 
  T 
  ith 
  pale 
  ochreous 
  markings, 
  but 
  one 
  can 
  be 
  

   found 
  that 
  may 
  almost 
  be 
  called 
  pale 
  whitish-ochreous, 
  with 
  dark 
  mark- 
  

   ings. 
  It 
  may 
  be 
  called 
  so 
  in 
  order 
  to 
  agree 
  with 
  Buckler's 
  description, 
  

   and 
  also 
  because, 
  by 
  analogy 
  of 
  other 
  plume 
  pupa?, 
  the 
  pale 
  is 
  the 
  ground 
  

   colour, 
  and 
  the 
  dark 
  is 
  the 
  marking. 
  The 
  spiracles 
  (2nd-7th 
  

   abdominal) 
  are 
  very 
  distinct 
  as 
  shining 
  brown 
  points 
  ; 
  the 
  legs, 
  maxilla?, 
  

   most 
  of 
  the 
  antenna?, 
  and 
  much 
  of 
  the 
  wings, 
  are 
  black 
  ; 
  the 
  bases 
  of 
  

   the 
  antenna?, 
  and 
  some 
  markings 
  on 
  the 
  head 
  and 
  marblings 
  on 
  the 
  

   mesothorax, 
  and 
  wing- 
  spines 
  (bases), 
  are 
  ochreous. 
  The 
  metathorax 
  is 
  

   also 
  very 
  dark 
  ; 
  the 
  abdomen 
  is 
  paler, 
  ochreous, 
  with 
  a 
  faint 
  greenish 
  

   tinge 
  ; 
  this 
  has 
  various 
  black 
  (not 
  brown) 
  markings 
  ; 
  of 
  these, 
  a 
  

   lateral 
  line 
  (below 
  iv 
  and 
  v) 
  of 
  some 
  width, 
  and 
  a 
  narrower 
  one 
  below 
  

   it, 
  are 
  fairly 
  straight 
  and 
  linear 
  ; 
  in 
  calling 
  these 
  markings 
  black, 
  they 
  

   are 
  really 
  very 
  thin 
  black, 
  through 
  which 
  the 
  pale 
  tint 
  of 
  the 
  interior 
  

   shows 
  sufficiently 
  to 
  prevent 
  the 
  black 
  being 
  solid 
  and 
  dense. 
  A 
  dorsal 
  

   line 
  takes 
  the 
  form 
  of 
  triangles, 
  as 
  noted 
  by 
  Buckler 
  ; 
  on 
  the 
  1st. 
  2nd 
  

   and 
  3rd 
  abdominal 
  segments, 
  they 
  consist 
  of 
  very 
  fine 
  linos 
  sloping 
  

   outwards 
  and 
  backwards 
  ; 
  two 
  of 
  these 
  form 
  a 
  central 
  triangle 
  with 
  an 
  

   acute 
  angle 
  forwards, 
  enclosing 
  a 
  small 
  black 
  triangle 
  ; 
  the 
  lines 
  out- 
  

   side 
  the 
  triangle 
  are 
  rather 
  reticulate; 
  from 
  the 
  4th 
  abdominal 
  segment 
  

   onwards, 
  the 
  whole 
  triangle 
  is 
  black, 
  and 
  somewhat 
  blurred 
  into 
  an 
  

   irregular 
  dorsal 
  band. 
  Above 
  tubercle 
  iii 
  is 
  a 
  line, 
  also 
  irregular, 
  as 
  

  

  * 
  Barrett 
  tulils 
  (Ent. 
  Mo. 
  Mag., 
  viii.. 
  p. 
  L54) 
  that 
  the 
  pupa 
  is 
  destitute 
  of 
  hairs 
  

   like 
  those 
  of 
  the 
  allied 
  species 
  (ijoiioihictiila, 
  orlirodacti/la, 
  etc.). 
  This 
  is 
  erroneous 
  

   all 
  these 
  pupa) 
  possess 
  the 
  primary 
  seta 
  1 
  in 
  the 
  pupal 
  stage 
  (Tutt). 
  

  

  