﻿STENOPTILIA 
  PTEKODACTYLA. 
  877 
  

  

  in 
  their 
  directions 
  and 
  the 
  swelling 
  of 
  their 
  bases, 
  the 
  complicated 
  

   structure 
  of 
  the 
  Amblyptiliines. 
  Tubercle 
  iii 
  is 
  just 
  above 
  the 
  spiracle 
  ; 
  

   iv 
  and 
  v 
  are 
  on 
  a 
  level, 
  and 
  also 
  on 
  a 
  little 
  smooth 
  antero-posterior 
  

   ridge, 
  that 
  breaks 
  through 
  all 
  the 
  small 
  transverse 
  ribs, 
  after 
  the 
  front 
  

   three 
  or 
  four 
  ; 
  tubercle 
  vi 
  is 
  on 
  nearly 
  the 
  last 
  rib 
  ; 
  vii 
  has 
  three 
  hairs 
  

   in 
  an 
  antero-posterior 
  curve. 
  The 
  free 
  appendages 
  reach 
  to 
  about 
  the 
  

   end 
  of 
  the 
  5th 
  abdominal 
  segment; 
  the 
  appendages 
  have 
  fine 
  transverse 
  

   ribs, 
  with 
  apparently 
  minute 
  pits. 
  The 
  wings 
  have 
  fine 
  dark 
  lines 
  with 
  

   arborescent 
  branches, 
  invisible 
  without 
  strong 
  magnification. 
  The 
  for- 
  

   ward 
  cremastral 
  group 
  of 
  hairs 
  is 
  very 
  distinctly 
  in 
  two 
  bunches, 
  one 
  on 
  

   each 
  side, 
  each 
  radiating 
  from 
  a 
  centre, 
  and 
  consisting 
  of 
  35 
  or 
  40 
  hairs, 
  

   0-14mm.-0-3mm. 
  long, 
  with 
  fine 
  fish-hook 
  points. 
  The 
  anal 
  group 
  is 
  

   quite 
  as 
  numerous, 
  closely 
  packed 
  in 
  an 
  area 
  of 
  0*4mm. 
  in 
  length, 
  

   shorter 
  than 
  the 
  other 
  set 
  (about 
  02mm.). 
  The 
  transverse 
  ribbing 
  is 
  

   rather 
  bolder 
  than 
  that 
  of 
  A. 
  zophodactylus, 
  and 
  the 
  ribs 
  are 
  only 
  

   about 
  12 
  in 
  number 
  in 
  the 
  dorsal 
  line. 
  The 
  finer 
  sculpturing 
  of 
  pits 
  

   is 
  not 
  very 
  clear, 
  even 
  in 
  the 
  spaces, 
  and 
  does 
  not 
  appear 
  to 
  go 
  over 
  the 
  

   ribs. 
  The 
  ribs 
  are, 
  in 
  fact, 
  somewhat 
  smooth 
  on 
  top, 
  and 
  have 
  irregular 
  

   margins, 
  minute 
  subridges 
  branching 
  down 
  from 
  the 
  sides. 
  This 
  is, 
  

   perhaps, 
  as 
  marked 
  a 
  difference 
  from 
  that 
  of 
  A. 
  zo 
  pi 
  ho 
  dactyl 
  us 
  as 
  the 
  

   pupa 
  presents 
  (Chapman, 
  May 
  27th, 
  1904). 
  Length 
  about 
  11 
  -5mm. 
  

   Width 
  at 
  thorax 
  slightly 
  over 
  2mm. 
  Long 
  and 
  slender, 
  of 
  unmis- 
  

   takable 
  Platyptiliid 
  shape, 
  but 
  less 
  robust. 
  In 
  outline, 
  it 
  forms 
  

   almost 
  a 
  straight 
  line 
  medioventrally, 
  and 
  up 
  the 
  extended 
  legs, 
  and 
  to 
  

   the 
  head. 
  Beyond 
  a 
  very 
  slight 
  projection 
  of 
  the 
  ventral 
  headpiece, 
  the 
  

   contour 
  sweeps 
  backwards, 
  in 
  the 
  segment 
  of 
  an 
  arc, 
  to 
  the 
  slightly 
  

   raised 
  hump 
  on 
  the 
  posterior 
  of 
  the 
  mesothorax; 
  from 
  here, 
  to 
  the 
  

   extremity 
  of 
  the 
  pupa, 
  the 
  dorsal 
  outline 
  is 
  quite 
  even, 
  but 
  either 
  curved 
  

   or 
  straight, 
  according 
  to 
  the 
  posture 
  of 
  the 
  pupa. 
  Ventrally, 
  from 
  the 
  

   extremity 
  of 
  the 
  wing-cases, 
  there 
  is 
  little 
  or 
  no 
  tapering 
  until 
  the 
  5th 
  

   abdominal 
  segment, 
  but, 
  from 
  here 
  to 
  the 
  8th 
  abdominal, 
  there 
  is 
  a 
  

   quite 
  noticeable 
  curved 
  tapering 
  ; 
  from 
  the 
  8th 
  to 
  the 
  anus, 
  the 
  pupa 
  

   has 
  the 
  usual 
  Alucitid, 
  sharply-cut, 
  tapering, 
  reaching 
  to 
  the 
  termination 
  

   of 
  the 
  anus. 
  This 
  gives 
  the 
  pupa 
  the 
  appearance 
  of 
  having 
  been 
  cut 
  at 
  

   an 
  oblique 
  angle, 
  from 
  the 
  ventral 
  side 
  of 
  the 
  8th 
  abdominal 
  segment 
  to 
  

   the 
  extremity 
  of 
  the 
  10th, 
  with 
  a 
  sharp 
  knife. 
  It 
  is 
  quite 
  smooth 
  and 
  

   without 
  hairs, 
  except 
  for 
  the 
  minute 
  primary 
  setae. 
  The 
  diameter 
  at 
  

   the 
  3rd 
  abdominal 
  segment 
  is 
  about 
  2mm. 
  (measured 
  from 
  empty 
  

   pupa-skin). 
  The 
  2nd 
  and 
  3rd 
  abdominal 
  segments 
  are 
  the 
  longest; 
  

   the 
  other 
  segments 
  shortening 
  off 
  in 
  both 
  directions, 
  except 
  the 
  meso- 
  

   thorax, 
  which 
  is, 
  as 
  usual, 
  of 
  large 
  size. 
  The 
  intersegmental 
  area 
  at 
  

   the 
  posterior 
  end 
  of 
  the 
  3rd, 
  4th, 
  5th, 
  and 
  6th 
  abdominal 
  segments, 
  is 
  

   a 
  very 
  marked 
  feature 
  of 
  the 
  pupal 
  skin, 
  after 
  the 
  emergence 
  of 
  the 
  

   imago, 
  owing 
  to 
  its 
  smoothness 
  and 
  opacity; 
  it 
  comprises 
  quite 
  a 
  

   quarter 
  of 
  the 
  length 
  of 
  the 
  4th 
  and 
  5th 
  segments, 
  and 
  slightly 
  more 
  

   than 
  a 
  fourth 
  of 
  the 
  6th 
  abdominal 
  segment. 
  The 
  transverse 
  striatums, 
  

   or 
  ribs, 
  are 
  a 
  marked 
  characteristic 
  of 
  the 
  dorsal 
  area 
  of 
  all 
  the 
  seg- 
  

   ments 
  from, 
  and 
  including, 
  the 
  metathorax, 
  ami, 
  on 
  the 
  lateral 
  and 
  

   ventral 
  areas 
  of 
  the 
  free 
  segments, 
  on 
  which 
  their 
  development 
  is 
  

   stronger- 
  upwards 
  of 
  20 
  may 
  be 
  counted 
  on 
  the 
  1th 
  abdominal 
  seg- 
  

   ment. 
  Viewed 
  ventrally, 
  the 
  tapering 
  towards 
  the 
  anus 
  is 
  long 
  and 
  

   gradual, 
  but, 
  laterally, 
  it 
  is 
  more 
  abrupt, 
  chielly 
  from 
  the 
  posterior 
  end 
  of 
  

   the 
  6th 
  abdominal. 
  A 
  marked 
  double 
  dorsal 
  ridge 
  rises 
  on 
  the 
  promi- 
  

  

  