﻿OXYPTILUS 
  PARVIDACTYLA. 
  

  

  427 
  

  

  grown 
  larva 
  (Hofmann. 
  Same 
  larva, 
  June 
  28th, 
  1898). 
  Length 
  5mm., 
  

   thickness 
  2mm., 
  diminishing 
  to 
  each 
  end 
  ; 
  the 
  hairs 
  on 
  tubercle 
  ii 
  are 
  

   nearly 
  1mm. 
  long; 
  that 
  on 
  i 
  is 
  short, 
  and 
  arises 
  close 
  to 
  ii; 
  that 
  on 
  iii 
  

   is 
  about 
  06mm. 
  long. 
  The 
  spiracles 
  are 
  faintly 
  rufous, 
  iv 
  and 
  v 
  are 
  

   in 
  usual 
  positions, 
  apparently 
  on 
  separate 
  bases 
  and 
  a 
  little 
  way 
  apart, 
  

   v, 
  about 
  0-7mm., 
  directed 
  outwards, 
  iv 
  shorter 
  and 
  directed 
  forwards, 
  

   vi 
  is 
  solitary, 
  towards 
  middle 
  of 
  segment, 
  directed 
  backwards. 
  There 
  

   are 
  no 
  secondary 
  tubercular 
  hairs, 
  but, 
  on 
  the 
  dorsum, 
  are 
  a 
  good 
  

   many 
  secondary 
  skin-hairs. 
  The 
  head 
  is 
  pale 
  brownish, 
  with 
  

   darker 
  markings 
  at 
  back 
  and 
  marginally. 
  There 
  are 
  indications 
  

   of 
  dark 
  longitudinal 
  lines 
  above 
  vi, 
  and 
  along 
  spiracles, 
  forming 
  

   a 
  broadish 
  mark 
  at 
  spiracles, 
  wanting 
  behind 
  and 
  narrow- 
  

   ing 
  forwards 
  ; 
  a 
  faint 
  line 
  through 
  iii, 
  and 
  a 
  similar 
  one 
  half- 
  

   way 
  between 
  it 
  and 
  ii. 
  Between 
  i 
  and 
  ii, 
  dorsally, 
  is 
  a 
  small 
  dark 
  

   mark, 
  somewhat 
  horse-shoe-shaped, 
  with 
  convexity 
  forwards 
  ; 
  legs 
  

   colourless 
  ; 
  a 
  few 
  brownish 
  marks 
  on 
  prothoracic 
  plate. 
  Other 
  details 
  

   want 
  a 
  better 
  lens 
  (Chapman. 
  April 
  27th, 
  1906). 
  Final 
  instar 
  : 
  

   6mm. 
  long 
  ; 
  sluggish, 
  stouter 
  than 
  the 
  larva 
  of 
  0. 
  pilosellae, 
  dirty 
  

   yellow 
  in 
  tint 
  (whilst 
  that 
  of 
  0. 
  pilosellae 
  appears 
  whitish 
  -yellow); 
  the 
  

   skin 
  is 
  smooth, 
  without 
  the 
  white 
  knobbed 
  bristles 
  of 
  0. 
  pilosellae 
  

   larva. 
  Head 
  bright 
  brown, 
  shining 
  ; 
  prothoracic 
  shield 
  yellow, 
  with 
  

   two 
  black 
  spots 
  on 
  each 
  side 
  of 
  the 
  hind 
  margin 
  ; 
  both 
  are 
  strongly 
  

   bristly. 
  The 
  very 
  characteristic 
  anal 
  shield 
  is 
  large, 
  semicircular, 
  

   yellow, 
  thickened 
  with 
  brown 
  on 
  the 
  hind 
  margin, 
  and 
  thickly 
  covered 
  

   with 
  numerous, 
  bristly, 
  little 
  tubercles; 
  also 
  numerous 
  bristles 
  are 
  

   scattered 
  over 
  the 
  surface 
  of 
  the 
  claspers. 
  The 
  tubercles 
  are 
  brown 
  on 
  

   the 
  back 
  (i 
  and 
  ii), 
  standing 
  closely 
  together, 
  each 
  with 
  a 
  strong 
  brown 
  

   hair 
  ; 
  on 
  the 
  sides, 
  on 
  the 
  other 
  hand, 
  the 
  hairs 
  of 
  the 
  tubercles 
  are 
  

   whitish, 
  as 
  in 
  the 
  larva 
  of 
  0. 
  pilosellae. 
  Between 
  the 
  dorsal 
  tubercles 
  

   on 
  each 
  segment, 
  is 
  a 
  small 
  horse-shoe-shaped 
  depression, 
  open 
  

   posteriorly. 
  Spiracles 
  finely 
  ringed 
  with 
  black. 
  Thoracic 
  legs 
  small, 
  

   light 
  brown 
  ; 
  abdominal 
  prolegs 
  very 
  small, 
  yellow, 
  with 
  few, 
  or 
  not 
  

   any, 
  hooklets 
  on 
  the 
  sole. 
  Anal 
  claspers 
  still 
  more 
  ill-developed 
  

   (June 
  2nd, 
  1897. 
  Hofmann). 
  The 
  setas 
  are 
  long 
  ; 
  those 
  on 
  

   tubercle 
  ii, 
  on 
  the 
  middle 
  abdominal 
  segments, 
  being 
  l*75mm. 
  

   long; 
  slender, 
  dark 
  basally, 
  but 
  for 
  the 
  greater 
  part 
  of 
  the 
  length 
  

   colourless. 
  The 
  prothoracic 
  plate 
  has 
  the 
  usual 
  six 
  hairs 
  on 
  each 
  side, 
  

   the 
  end 
  ones 
  of 
  the 
  back 
  row 
  being 
  the 
  smallest, 
  the 
  longest 
  about 
  

   0'8mm. 
  The 
  plate 
  is 
  rather 
  square-ended, 
  has 
  a 
  median 
  pale 
  

   suture, 
  with 
  some 
  spots 
  of 
  clouding 
  along 
  it, 
  especially 
  at 
  posterior 
  

   margin, 
  and 
  a 
  patch 
  of 
  dark 
  in 
  usual 
  site 
  of 
  dark 
  mark 
  in 
  

   Platyptiliids. 
  Spiracle 
  large, 
  thimble-shaped, 
  a 
  group 
  of 
  three 
  hairs 
  in 
  

   front 
  of 
  it, 
  two 
  front 
  ones 
  above 
  each 
  other, 
  length 
  about 
  0'4mm. 
  No 
  

   hairs 
  at 
  base 
  of 
  leg, 
  about 
  0*26mm. 
  This 
  segment 
  has 
  four 
  secondary 
  

   hairs 
  below 
  spiracle, 
  and 
  four 
  between 
  legs 
  and 
  the 
  two 
  basal 
  hairs. 
  Meso- 
  

   thorax 
  has 
  the 
  usual 
  four 
  pairs 
  of 
  hairs 
  (the 
  third 
  pair 
  with 
  accessory), 
  

   each 
  pair 
  on 
  a 
  plate 
  of 
  its 
  own, 
  no 
  skin-points 
  being 
  between 
  them, 
  

   but 
  the 
  plate 
  is 
  weak 
  and 
  colourless 
  — 
  the 
  1st 
  hair, 
  with 
  wide 
  divided 
  

   point, 
  about 
  O'fimm., 
  the 
  2nd 
  about 
  l*4mm., 
  3rd 
  with 
  bifid 
  point, 
  

   0'4mm., 
  4th 
  l-2mm., 
  5th 
  0-Sinni., 
  6th 
  0'7nim., 
  the 
  accessory, 
  with 
  a 
  

   bifid 
  point, 
  03mm., 
  on 
  7th 
  and 
  8th 
  0'8mm. 
  and 
  0*6mm. 
  This 
  seg- 
  

   ment 
  (mesothorax) 
  has 
  about 
  29 
  secondary 
  hairs 
  on 
  either 
  side, 
  not 
  

   symmetrically 
  arranged, 
  but 
  none 
  on 
  front 
  half 
  of 
  segment, 
  except 
  

  

  