﻿PLATYPTILIA 
  GONODACTYLAo 
  209 
  

  

  dark 
  dorsal 
  stripe 
  and 
  black 
  head 
  (Tutt); 
  nearly 
  2mm. 
  long, 
  with 
  body 
  

   as 
  wide 
  or 
  wider 
  than 
  the 
  black 
  head 
  ; 
  the 
  prothoracic 
  and 
  anal 
  plates 
  

   also 
  black 
  ; 
  the 
  hairs, 
  on 
  the 
  contrary, 
  rather 
  pale 
  ; 
  the 
  tubercles 
  all 
  

   single 
  -haired, 
  i 
  with 
  a 
  shorter 
  hair 
  directed 
  forwards 
  ; 
  ii 
  with 
  a 
  longer 
  

   one 
  pointing 
  backwards 
  ; 
  iii 
  long 
  and 
  directed 
  forwards 
  ; 
  the 
  spiracles 
  

   large, 
  each 
  forming 
  a 
  prominent 
  truncated 
  flat 
  cone 
  ; 
  tubercles 
  iv 
  and 
  

   v 
  on 
  a 
  common 
  base, 
  the 
  former 
  carrying 
  a 
  very 
  long 
  hair 
  directed 
  

   outwards 
  and 
  a 
  little 
  backwards, 
  whilst 
  the 
  latter, 
  above 
  and 
  in 
  front 
  

   of 
  iv, 
  carries 
  a 
  shorter 
  hair; 
  this 
  is 
  very 
  much 
  directly 
  above 
  the 
  other, 
  

   so 
  that 
  unless 
  one 
  is 
  careful 
  to 
  get 
  a 
  proper 
  view, 
  one 
  is 
  apt 
  to 
  think 
  it 
  

   is 
  directly 
  above 
  it 
  ; 
  tubercle 
  vi 
  seems 
  absent. 
  On 
  the 
  thoracic 
  seg- 
  

   ments 
  the 
  hairs 
  forming 
  the 
  1st 
  and 
  2nd 
  pairs 
  are 
  near 
  together 
  ; 
  iii 
  is 
  

   without 
  any 
  accessory 
  behind 
  it. 
  Two 
  prespiracular 
  hairs 
  are 
  found 
  on 
  

   prothorax; 
  in 
  front 
  of 
  the 
  spiracle 
  are 
  several 
  rows 
  or 
  rather 
  a 
  small 
  patch 
  

   of 
  recurved 
  short 
  hooks, 
  and 
  some 
  occur 
  also 
  behind 
  the 
  spiracles, 
  these 
  

   appear 
  to 
  be 
  skin-points, 
  not 
  detected 
  on 
  other 
  parts 
  of 
  the 
  larva. 
  

   Second 
  instar 
  : 
  The 
  larva 
  is 
  3mm. 
  long, 
  3'5mm. 
  if 
  fully 
  extended. 
  It 
  

   differs 
  from 
  the 
  previous 
  instar 
  in 
  having 
  tubercle 
  vi 
  present, 
  and 
  in 
  

   having 
  a 
  covering 
  of 
  skin-points. 
  The 
  longer 
  hairs 
  on 
  ii 
  and 
  iii 
  are 
  

   about 
  0-2mm. 
  in 
  length, 
  quite 
  simple 
  ; 
  whilst, 
  on 
  the 
  7th 
  and 
  8th 
  

   abdominal 
  segments, 
  that 
  on 
  tubercle 
  ii 
  is 
  about 
  0-25mm. 
  long. 
  The 
  

   head, 
  thoracic 
  plate, 
  legs 
  and 
  anal 
  plate 
  black. 
  Most 
  of 
  the 
  skin-points 
  

   are 
  rounded 
  below, 
  but 
  terminate 
  in 
  a 
  fine 
  needle-like 
  point. 
  The 
  

   prolegs 
  have 
  five 
  hooklets 
  as 
  against 
  four 
  in 
  the 
  first 
  instar. 
  Third 
  

   instar 
  : 
  In 
  form 
  and 
  colouring' 
  apparently 
  like 
  the 
  fullfed 
  larva 
  

   (Chapman). 
  ? 
  Penultimate 
  instar 
  (May 
  1st, 
  1904). 
  — 
  About 
  10mm. 
  in 
  

   length, 
  2mm.-2-5mm. 
  in 
  thickness 
  ; 
  the 
  body 
  more 
  or 
  less 
  cylindrical, 
  

   gradually 
  (but 
  noticeably) 
  tapering 
  to 
  either 
  end. 
  The 
  head 
  and 
  

   thoracic 
  segments 
  are 
  rather 
  small 
  ; 
  the 
  anus 
  also 
  is 
  small 
  and 
  some- 
  

   what 
  pointed. 
  The 
  segments 
  clear 
  and 
  plump, 
  without 
  being 
  accentu- 
  

   ated 
  in 
  this 
  respect 
  ; 
  there 
  is 
  a 
  slight 
  central 
  incision 
  dividing 
  each 
  

   segment 
  into 
  two 
  poorly 
  marked 
  subsegments. 
  Head 
  small, 
  rounded, 
  

   with 
  a 
  polished 
  black 
  surface. 
  The 
  prothoracic 
  scutellum 
  is 
  conspicu- 
  

   ous, 
  polished 
  similarly 
  to 
  the 
  head, 
  also 
  jet 
  black, 
  but 
  with 
  a 
  narrow 
  white 
  

   mediodorsal 
  streak 
  across 
  it 
  ; 
  the 
  anal 
  plate 
  inconspicuous, 
  chitinous, 
  

   but 
  coloured 
  as 
  a 
  portion 
  of 
  the 
  body 
  and 
  not 
  distinctively 
  ; 
  the 
  true 
  legs 
  

   are 
  black 
  ; 
  the 
  prolegs 
  short 
  in 
  comparison 
  with 
  those 
  of 
  the 
  external- 
  

   feeding 
  Alucitid 
  larva?. 
  [The 
  larva 
  uses 
  an 
  abundance 
  of 
  silk, 
  dropping 
  

   on 
  a 
  thread 
  on 
  any 
  and 
  every 
  opportunity 
  ; 
  it 
  also 
  has 
  the 
  micro 
  habit 
  

   of 
  crawling 
  in 
  jerks, 
  and 
  the 
  ability 
  to 
  crawl 
  backwards.] 
  A 
  marked 
  

   lateral 
  flange 
  is 
  one 
  of 
  its 
  noticeable 
  features, 
  but 
  this 
  is 
  situated 
  

   rather 
  low 
  down, 
  and 
  best 
  observed 
  ventrally. 
  The 
  larval 
  colours 
  are 
  

   pale 
  brown 
  beneath, 
  reddish-brown 
  above, 
  with 
  pale 
  or 
  dirty-white 
  

   irregular 
  bands, 
  one 
  on 
  either 
  side 
  of 
  the 
  mediodorsal 
  area, 
  one 
  sub- 
  

   dorsal 
  and 
  one 
  lateral. 
  The 
  skin-surface 
  appears 
  shiny, 
  but 
  it 
  bears 
  a 
  

   tolerably 
  dense 
  coat 
  of 
  minute 
  spicules, 
  and, 
  in 
  addition, 
  there 
  is 
  a 
  

   scattered 
  coat 
  of 
  short 
  tapering 
  black 
  secondary 
  hairs 
  ; 
  those 
  are 
  stout 
  

   enough 
  to 
  appear 
  bristly 
  under 
  a 
  1-inch 
  objective 
  ; 
  each 
  of 
  them 
  arises 
  

   from 
  a 
  small 
  chitinous 
  black 
  base, 
  and 
  it 
  is 
  these 
  that 
  are 
  chiefly 
  

   responsible 
  for 
  the 
  rough 
  appearance 
  of 
  the 
  larva. 
  The 
  tubercles 
  

   proper 
  consist 
  of 
  primitive 
  seta* 
  arising 
  from 
  slightly 
  raised 
  chitinous 
  

   buttons, 
  each 
  surrounded 
  with 
  a 
  small 
  area 
  of 
  chitinised 
  skin-surface 
  ; 
  

   tubercles 
  i 
  and 
  ii 
  on 
  meso- 
  and 
  metathorax 
  are 
  set 
  transversely, 
  with 
  a 
  

  

  