﻿PLATYPTILIIDI. 
  159 
  

  

  with 
  dark 
  scaling, 
  the 
  pale 
  hind 
  tibiae, 
  as 
  a 
  rule, 
  ringed 
  with 
  darker 
  

   colour 
  in 
  the 
  centre 
  and 
  at 
  the 
  ends." 
  

  

  The 
  same 
  author 
  (op. 
  cit., 
  p. 
  38) 
  also 
  gives 
  a 
  detailed 
  account, 
  with 
  

   figures, 
  of 
  the 
  $ 
  genital 
  organs. 
  He 
  says 
  that, 
  in 
  the 
  different 
  Platyp- 
  

   tiliid 
  species, 
  the 
  various 
  parts 
  (pi. 
  iii., 
  figs, 
  la-c) 
  show 
  little 
  or 
  no 
  differ- 
  

   ence. 
  The 
  dorsal 
  plate 
  of 
  the 
  ninth 
  segment 
  consists 
  of 
  two 
  symmetrical, 
  

   nearly 
  square, 
  parts, 
  which 
  become 
  somewhat 
  narrower 
  behind, 
  and 
  

   have 
  rounded 
  corners 
  and 
  are 
  bent 
  inwards 
  slightly 
  at 
  the 
  sides 
  ; 
  they 
  

   have 
  their 
  exterior 
  margins 
  bent 
  downwards 
  ; 
  a 
  strong, 
  mostly 
  hairy, 
  

   uncus 
  (representing 
  the 
  tenth 
  dorsal 
  plate), 
  bent 
  decidedly 
  downwards, 
  

   arises 
  in 
  the 
  median 
  line 
  between 
  the 
  two 
  halves 
  of 
  the 
  ninth 
  dorsal 
  

   plate. 
  The 
  genital 
  claspers 
  are 
  extended, 
  over-reaching 
  the 
  uncus, 
  and 
  

   strongly 
  concave 
  on 
  their 
  inner 
  surface. 
  The 
  ninth 
  ventral 
  plate 
  is 
  

   small, 
  square 
  and 
  emarginate 
  behind, 
  or 
  oval 
  and 
  furnished 
  with 
  a 
  

   short 
  point 
  behind. 
  

  

  When 
  at 
  rest, 
  the 
  wings 
  are 
  held 
  horizontally, 
  flat, 
  and 
  at 
  right 
  

   angles 
  to 
  the 
  body, 
  so 
  as 
  to 
  form 
  a 
  straight 
  line 
  ; 
  the 
  hindwings 
  drawn 
  

   up 
  under 
  the 
  forewings 
  ; 
  the 
  insects 
  cling 
  by 
  the 
  front 
  and 
  middle 
  

   legs, 
  whilst 
  the 
  hind 
  legs 
  stand 
  out 
  behind 
  and 
  away 
  from 
  the 
  body, 
  

   or 
  otherwise 
  have 
  the 
  tarsi 
  crossed 
  over 
  the 
  tip 
  of 
  the 
  abdomen. 
  A 
  

   similar 
  habit 
  prevails 
  in 
  Eucnemidophorus, 
  Amblyptilia, 
  etc. 
  

  

  Hofmann 
  gives 
  the 
  following 
  diagnostic 
  table 
  of 
  the 
  Platyptiliid 
  

   species 
  found 
  in 
  Germany 
  (Die 
  deutsch. 
  Pteroph., 
  pp. 
  39 
  et 
  seq.) 
  : 
  — 
  

  

  I. 
  The 
  third 
  plumule 
  with 
  a 
  dark 
  tuft 
  of 
  scales 
  on 
  the 
  inner 
  margin 
  near 
  the 
  

   apex 
  — 
  metzneri, 
  Zell. 
  

  

  II. 
  The 
  third 
  plumule 
  with 
  a 
  dark 
  tooth- 
  or 
  streak-like 
  tuft 
  of 
  scales 
  in 
  the 
  

   centre 
  of 
  the 
  inner 
  marginal 
  fringe 
  (sometimes 
  only 
  very 
  faint 
  or 
  even 
  quite 
  absent). 
  

  

  A. 
  Palpi 
  and 
  frontal 
  tuft 
  about 
  as 
  long 
  as 
  the 
  head, 
  or 
  somewhat 
  shorter 
  ; 
  

   frontal 
  tuft 
  more 
  or 
  less 
  exceeded 
  by 
  the 
  tips 
  of 
  the 
  palpi. 
  

   1. 
  With 
  only 
  one 
  light 
  band 
  across 
  both 
  lobes 
  (as 
  the 
  pale 
  spot 
  before 
  the 
  

   cleft 
  is 
  never 
  developed 
  into 
  a 
  complete 
  transverse 
  band). 
  

   a. 
  With 
  dark 
  costal 
  triangle*. 
  

  

  a. 
  Expanse 
  12mm. 
  Forewings 
  grey-brown, 
  

  

  with 
  little 
  yellowish 
  mixture, 
  strong 
  

  

  white 
  scaling, 
  and 
  not 
  sharply 
  defined 
  

  

  darkening 
  of 
  the 
  inner 
  tip 
  in 
  contrast 
  with 
  

  

  the 
  rest 
  of 
  the 
  wing 
  surface 
  ; 
  the 
  dark 
  

  

  basal 
  line 
  of 
  the 
  outer 
  marginal 
  fringes 
  of 
  

  

  the 
  fore-tip 
  interrupted 
  by 
  a 
  white 
  spot 
  ; 
  

  

  the 
  black 
  scales 
  of 
  the 
  inner 
  margin 
  of 
  

  

  the 
  third 
  feather 
  form 
  only 
  a 
  short 
  streak 
  

  

  or 
  spot 
  .. 
  .. 
  .. 
  .. 
  .. 
  gonodactyla, 
  Schiff. 
  

  

  /3. 
  Small, 
  9-5mm.-10mm., 
  dark 
  greyish-brown 
  

  

  with 
  little 
  white 
  scaling 
  ; 
  the 
  dark 
  basal 
  

  

  line 
  of 
  the 
  outer 
  marginal 
  fringes 
  of 
  the 
  

  

  fore-tip 
  not 
  interrupted. 
  The 
  scale-spot 
  

  

  in 
  the 
  inner 
  marginal 
  fringes 
  of 
  the 
  

  

  third 
  feather 
  very 
  small 
  .. 
  .. 
  .. 
  farfarella, 
  Zell. 
  

  

  y. 
  Large, 
  14mm. 
  -15mm., 
  ochreous-yellow 
  ; 
  first 
  

  

  feather 
  below 
  unmarked 
  (rarely 
  with 
  an 
  

  

  indication 
  of 
  a 
  fine 
  yellowish 
  transverse 
  

  

  line 
  before 
  the 
  apex). 
  The 
  dark 
  basal 
  

  

  line 
  of 
  the 
  outer 
  marginal 
  fringes 
  of 
  the 
  

  

  fore-tip 
  not 
  interrupted. 
  Costal 
  triangle 
  

  

  curtailed 
  below. 
  The 
  accumulation 
  of 
  

  

  black 
  scales 
  in 
  the 
  inner 
  marginal 
  fringes 
  

  

  of 
  the 
  third 
  feather 
  streak-like 
  and 
  rather 
  

  

  long 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  ncmorali*, 
  Zell. 
  

  

  * 
  The 
  four 
  species 
  a-5 
  have 
  similarly 
  formed 
  genitalia 
  in 
  the 
  $ 
  (Hofmann). 
  

  

  