﻿STBNOPTILIIDI. 
  317 
  

  

  broadest, 
  with 
  very 
  oblique 
  margin 
  and 
  indicated 
  anal 
  angle 
  ; 
  the 
  second 
  narrower, 
  

   with 
  elongated 
  apex 
  ; 
  the 
  third 
  linear, 
  without 
  dark 
  scales 
  on 
  inner 
  margin. 
  

   Neuration 
  : 
  Perfect, 
  and 
  shows 
  no 
  essential 
  difference 
  from 
  that 
  of 
  the 
  genera, 
  

   Eucnemidophorus, 
  Platyptilia, 
  and 
  Amblyptilia. 
  Genital 
  organs 
  : 
  The 
  male 
  organs 
  

   of 
  copulation 
  differ 
  from 
  those 
  hitherto 
  noticed, 
  chiefly 
  because 
  there 
  is 
  no 
  uncus 
  

   attached 
  to 
  the 
  9th 
  dorsal 
  plate, 
  which 
  is 
  deeply 
  emarginated, 
  but 
  only 
  a 
  fine 
  thin 
  

   pencil-like 
  projection 
  protrudes 
  from 
  the 
  posterior 
  margin 
  (10th 
  dorsal 
  segment 
  ?). 
  

   The 
  claspers 
  are 
  deeply 
  hollowed, 
  boat-shaped, 
  and 
  terminate 
  posteriorly 
  in 
  two 
  

   somewhat 
  triangular-pointed 
  delicate 
  lobes, 
  and 
  a 
  strong 
  downwardly-curved 
  bristly 
  

   hook, 
  which 
  springs 
  from 
  a 
  broad 
  base 
  on 
  the 
  upper 
  margin, 
  and 
  extends 
  far 
  beyond 
  

   the 
  two 
  lobes. 
  At 
  the 
  origin 
  of 
  the 
  hook 
  stands 
  a 
  thick 
  pencil 
  of 
  stiff 
  bristles, 
  

   situated 
  on 
  a 
  chitinous 
  plate 
  projecting 
  towards 
  the 
  inner 
  hollow 
  of 
  the 
  clasper. 
  

   The 
  outer 
  side 
  of 
  the 
  clasper 
  is 
  also 
  thickly 
  beset 
  with 
  bristles. 
  The 
  9th 
  ventral 
  

   plate 
  is 
  very 
  small, 
  oval, 
  or 
  bluntly 
  triangular. 
  The 
  arcuate 
  down 
  ward 
  ly-curved 
  

   penis 
  is 
  very 
  long, 
  and 
  has, 
  close 
  to 
  the 
  base, 
  a 
  long 
  prominence 
  directed 
  down- 
  

   wards 
  (tab. 
  iii., 
  fig. 
  6). 
  In 
  the 
  different 
  species 
  examined 
  I 
  found 
  only 
  unessential 
  

   differences, 
  for 
  example, 
  in 
  the 
  greater 
  or 
  less 
  arching 
  of 
  the 
  9th 
  dorsal 
  plate, 
  in 
  the 
  

   form 
  of 
  the 
  terminal 
  lobes 
  of 
  the 
  claspers, 
  etc. 
  

  

  Hofmann 
  says 
  (Die 
  deutsch. 
  Pterophorinen, 
  p. 
  72) 
  : 
  " 
  The 
  species 
  of 
  

   the 
  genus 
  Stenoptilia 
  are 
  very 
  near 
  to 
  one 
  another, 
  and 
  are, 
  at 
  the 
  same 
  

   time, 
  in 
  coloration, 
  and 
  in 
  certain 
  elemental 
  markings, 
  very 
  variable, 
  so 
  

   that 
  the 
  determination 
  is 
  often 
  very 
  difficult. 
  At 
  the 
  most, 
  only 
  the 
  

   position 
  of 
  the 
  dark 
  dots 
  before 
  the 
  cleft 
  appears 
  to 
  be 
  constant. 
  By 
  

   this 
  character 
  the 
  species 
  may 
  be 
  divided 
  into 
  two 
  groups 
  : 
  — 
  

  

  I. 
  The 
  dots 
  on 
  the 
  cleft, 
  or 
  at 
  least 
  one 
  of 
  them, 
  the 
  lower, 
  are 
  placed 
  imme- 
  

  

  diately 
  on 
  the 
  cleft. 
  

   A. 
  The 
  dots 
  of 
  the 
  cleft 
  are 
  large, 
  one 
  directly 
  above 
  the 
  other, 
  in 
  very 
  

   close 
  vicinity, 
  often 
  united 
  or 
  blended 
  into 
  a 
  thick 
  transverse 
  

   streak. 
  

  

  1 
  . 
  A 
  thick 
  black 
  longitudinal 
  streak 
  in 
  the 
  upper 
  lobe 
  more 
  or 
  less 
  

  

  surrounded 
  by 
  white 
  scales, 
  especially 
  on 
  the 
  hind 
  and 
  upper 
  

   margins 
  ... 
  ... 
  ... 
  ... 
  pelidnodactyla, 
  Stein. 
  

  

  2. 
  A 
  black 
  longitudinal 
  streak 
  in 
  the 
  upper 
  lobe 
  only 
  very 
  slender, 
  or 
  

  

  only 
  indicated 
  by 
  black 
  scales 
  ; 
  a 
  very 
  oblique 
  white 
  trans- 
  

   verse 
  line 
  of 
  the 
  Upper 
  lobe 
  runs 
  into 
  the 
  costal 
  fringe 
  (or 
  is, 
  

   together 
  with 
  the 
  longitudinal 
  streak, 
  entirely 
  wanting) 
  

   ... 
  serotina, 
  Zell. 
  (and 
  var. 
  plagiodactyla, 
  Zell.) 
  (non 
  St.). 
  

   6. 
  The 
  dots 
  of 
  the 
  cleft 
  small, 
  the 
  upper 
  somewhat 
  distant 
  from 
  the 
  

   lower, 
  and 
  removed 
  further 
  in 
  towards 
  the 
  base, 
  or 
  quite 
  absent. 
  

   The 
  costal 
  fringes 
  of 
  the 
  upper 
  lobe 
  white. 
  

  

  1. 
  With 
  one 
  black 
  dot 
  in 
  the 
  fringes 
  of 
  the 
  anal 
  angle 
  of 
  the 
  

  

  upper 
  lobe 
  ... 
  ... 
  ... 
  atiginatodaetyla, 
  Zell. 
  

  

  2. 
  With 
  two 
  black 
  dots 
  in 
  the 
  same 
  . 
  . 
  . 
  zophodaetylux, 
  Dup. 
  

  

  II. 
  The 
  dots 
  of 
  the 
  cleft 
  are 
  separated 
  by 
  a 
  small, 
  often 
  brightly 
  coloured, 
  

  

  interval 
  (about 
  1mm.) 
  from 
  the 
  cleft. 
  

  

  1. 
  The 
  costal 
  fringes 
  of 
  the 
  upperlobe 
  white. 
  Forewings 
  Lighter, 
  or 
  darker. 
  

  

  cinnamon-brown. 
  . 
  .fusoa, 
  Zell. 
  (and 
  var. 
  paludicola, 
  Wallgrn.). 
  

  

  2. 
  The 
  costal 
  fringes 
  of 
  the 
  upper 
  lobe 
  almost, 
  for 
  a 
  short 
  distance, 
  jnst 
  

  

  beyond 
  the 
  cleft, 
  and 
  at 
  the 
  apex 
  white, 
  otherwise 
  dark. 
  

   a. 
  The 
  outer 
  marginal 
  fringes 
  of 
  the 
  upper 
  and 
  lower 
  lobes 
  white, 
  

   only 
  towards 
  the 
  anal 
  angle 
  brown, 
  with 
  a 
  connected 
  black 
  

   brown 
  basal 
  line. 
  

   a. 
  The 
  space 
  between 
  the 
  dots 
  of 
  the 
  cleft 
  and 
  the 
  clefl 
  bright 
  

   brownish-yellow, 
  often 
  dusted 
  with 
  white; 
  at 
  the 
  com- 
  

   mencement 
  of 
  the 
  upper 
  lobe 
  a 
  bleached 
  yellow 
  undefined 
  

   spot... 
  ... 
  ... 
  ... 
  graphodaetyln 
  t 
  Tr. 
  

  

  f-i. 
  Without 
  tlu 
  1 
  characteristics 
  given 
  lor 
  o. 
  on 
  the 
  contrary, 
  

  

  with 
  very 
  distinctly 
  expressed 
  oblique 
  white 
  line 
  on 
  the 
  

  

  upper 
  lobe, 
  which 
  is 
  mostly 
  continued 
  as 
  two 
  small 
  white 
  

  

  spot 
  lets 
  on 
  the 
  lower 
  lobe, 
  var. 
  pneumanantheri, 
  Schleich. 
  

  

  /». 
  The 
  outer 
  marginal 
  fringes 
  of 
  the 
  upper 
  and 
  lower 
  lobes 
  brownish, 
  

  

  with 
  a 
  white 
  basal 
  line, 
  in 
  which 
  one 
  black 
  dot 
  lies 
  at 
  (lip 
  

  

  