﻿378 
  

  

  BRITISH 
  LEPIDOPTERA. 
  

  

  nence 
  of 
  the 
  mesothorax, 
  and 
  is 
  continued 
  in 
  both 
  directions, 
  widening 
  

   out 
  gradually 
  as 
  it 
  descends 
  downwards 
  to 
  the 
  end 
  of 
  the 
  3rd 
  abdominal 
  

   segment, 
  where 
  it 
  is 
  interrupted 
  by 
  the 
  intersegmental 
  membrane 
  ; 
  on 
  

   the 
  4th, 
  5th, 
  6th, 
  and 
  7th 
  abdominal 
  segments, 
  it 
  exists 
  only 
  as 
  a 
  low 
  

   ridge 
  on 
  the 
  central 
  area; 
  on 
  the 
  8th, 
  9th, 
  and 
  part 
  of 
  the 
  10th, 
  it 
  

   again 
  becomes 
  a 
  continuous 
  and 
  conspicuous 
  double 
  ridge, 
  narrowing 
  

   down 
  towards 
  anus, 
  owing 
  to 
  the 
  diminishing 
  size 
  of 
  the 
  pupa, 
  but, 
  in 
  

   reality, 
  becoming 
  relatively 
  wider, 
  as 
  it 
  gets 
  nearer 
  and 
  nearer 
  to 
  the 
  

   lateral 
  area, 
  and 
  actually 
  forms 
  a 
  sharp 
  corner 
  between 
  the 
  lateral 
  and 
  

   dorsal 
  areas. 
  In 
  a 
  forward 
  direction 
  the 
  ridge 
  widens 
  out 
  as 
  it 
  is 
  con- 
  

   tinued 
  forwards 
  towards 
  the 
  head. 
  A 
  marked 
  lateral 
  ridge 
  is 
  also 
  

   present 
  from 
  the 
  anal 
  segment 
  forwards 
  to 
  the 
  anterior 
  of 
  the 
  7th 
  

   abdominal, 
  where 
  it 
  becomes 
  low 
  and 
  broad, 
  and 
  completely 
  interrupted 
  

   by 
  the 
  intersegmental 
  membrane, 
  like 
  the 
  dorsal 
  ridge 
  ; 
  its 
  line 
  is, 
  

   however, 
  continued 
  forwards 
  beyond 
  the 
  3rd 
  abdominal 
  segment, 
  by 
  

   the 
  edge 
  of 
  the 
  hind 
  margin 
  of 
  the 
  forewings. 
  This 
  system 
  of 
  dorsal 
  

   and 
  lateral 
  ridges 
  gives 
  the 
  pupa 
  a 
  very 
  angular 
  appearance, 
  and 
  

   probably 
  assists 
  in 
  its 
  general 
  scheme 
  of 
  cryptic 
  resemblance. 
  The 
  

   narrow 
  slip 
  of 
  hindwing 
  does 
  not 
  extend 
  so 
  far 
  as 
  the 
  end 
  of 
  the 
  2nd 
  

   abdominal 
  segment, 
  but, 
  owing 
  to 
  the 
  length 
  of 
  the 
  segments, 
  it 
  is 
  a 
  

   fairly 
  long 
  slip 
  in 
  relation 
  to 
  its 
  width. 
  The 
  leg- 
  and 
  antenna-cases 
  

   (as 
  is 
  usual 
  in 
  this 
  group) 
  project 
  very 
  far 
  as 
  free 
  appendages, 
  viz., 
  

   over 
  the 
  whole 
  of 
  the 
  4th, 
  and 
  the 
  greater 
  part 
  of 
  the 
  5th, 
  abdominal 
  

   segment, 
  a 
  supporting 
  corner 
  (formed 
  by 
  the 
  apices 
  of 
  the 
  wings) 
  

   extending 
  as 
  far 
  as 
  the 
  middle 
  of 
  the 
  4th 
  abdominal 
  segment. 
  The 
  

   spiracles 
  are 
  considerably 
  raised, 
  but 
  not 
  tube-like, 
  as 
  in 
  those 
  of 
  ma|y 
  

   Alucitid 
  larva? 
  ; 
  they 
  have 
  slit-like 
  openings. 
  The 
  hairs, 
  or 
  setae, 
  are 
  

   short, 
  and 
  the 
  dorsal 
  ones 
  curved, 
  and 
  either 
  knobbed 
  or 
  club-shaped. 
  

   Tubercles 
  i 
  and 
  ii 
  are 
  placed 
  on 
  the 
  dorsal 
  ridges, 
  situated 
  near 
  together 
  

   on 
  the 
  free 
  segments, 
  their 
  bases 
  back 
  to 
  back, 
  the 
  setae 
  pointing 
  

   respectively 
  in 
  a 
  posterior 
  and 
  anterior 
  direction, 
  in 
  a 
  manner 
  

   suggestive 
  of 
  their 
  position 
  in 
  the 
  pupae 
  of 
  some 
  of 
  the 
  allied 
  Oxypti- 
  

   lines. 
  The 
  intersegmental 
  membranes 
  are 
  strongly, 
  though 
  finely, 
  

   pitted 
  ; 
  the 
  pits 
  having 
  a 
  diamond-shaped 
  wall, 
  but 
  stretched 
  length- 
  

   wise; 
  on 
  the 
  ribbed 
  areas 
  pits 
  are 
  also 
  present, 
  but 
  they 
  are 
  less 
  

   numerous, 
  of 
  irregular 
  or 
  circular 
  shape, 
  and 
  without 
  walls. 
  The 
  sculp- 
  

   turing, 
  so 
  minutely 
  described 
  by 
  Chapman 
  in 
  the 
  pupa 
  of 
  A. 
  zophodac- 
  

   tylus 
  (antea, 
  pp. 
  329-330) 
  seems 
  to 
  be 
  nearly, 
  if 
  not 
  quite, 
  identical 
  in 
  this 
  

   species, 
  with 
  the 
  possible 
  exception 
  that, 
  in 
  the 
  pupa 
  of 
  S. 
  pterodactyla, 
  

   the 
  sculpturing 
  seems 
  to 
  be 
  somewhat 
  coarser. 
  The 
  setae 
  in 
  S. 
  ptero- 
  

   dactyla 
  are 
  certainly 
  longer 
  than 
  those 
  of 
  A. 
  zophodactylus 
  in 
  the 
  

   mounted 
  specimens 
  examined 
  (Bacot. 
  Described 
  from 
  pupa-case, 
  

   November 
  25th, 
  1905). 
  Rather 
  long 
  and 
  slender; 
  the 
  head, 
  which 
  is 
  

   the 
  thickest 
  part, 
  is 
  abruptly 
  rounded, 
  and 
  has 
  the 
  snout 
  very 
  promi- 
  

   nent 
  ; 
  thorax 
  and 
  abdomen 
  rounded 
  above, 
  rather 
  flattened 
  beneath, 
  

   and 
  attenuated 
  strongly 
  to 
  the 
  anal 
  point 
  ; 
  eye-, 
  leg-, 
  and 
  wing-cases 
  

   fairly 
  prominent, 
  the 
  last 
  prolonged 
  a 
  considerable 
  distance 
  over 
  the 
  

   abdominal 
  segments 
  (Porritt). 
  South 
  gives 
  a 
  short 
  description 
  of 
  

   the 
  pupa 
  (Ent., 
  xv., 
  p. 
  148). 
  

  

  Variation 
  of 
  pupa. 
  — 
  Porritt, 
  who 
  describes 
  two 
  forms 
  of 
  the 
  larva 
  

   (antea, 
  p. 
  375), 
  finds 
  two 
  somewhat 
  parallel 
  forms 
  of 
  the 
  pupa, 
  which 
  he 
  

   diagnoses 
  as 
  : 
  

  

  (1) 
  Bright 
  green, 
  with 
  little 
  of 
  any 
  other 
  colour 
  ; 
  the 
  abdominal 
  incisions 
  pale 
  

  

  

  