﻿458 
  Dr. 
  T. 
  A. 
  Chapman's 
  Contributions 
  to 
  

  

  colour 
  of 
  the 
  later 
  instars. 
  The 
  head 
  is 
  dark, 
  0'23 
  mm. 
  

   across, 
  the 
  jaws 
  brown, 
  with 
  five 
  sharp 
  teeth 
  and 
  a 
  short 
  

   one 
  on 
  the 
  lower 
  margin. 
  Ocelli, 
  five 
  in 
  a 
  curve 
  and 
  one 
  

   rather 
  larger 
  at 
  centre 
  of 
  curve. 
  The 
  prothoracic 
  plate 
  is 
  

   pointed 
  at 
  each 
  side, 
  and 
  produced 
  to 
  a 
  blunt 
  angle 
  pos- 
  

   teriorly, 
  but 
  only 
  somewhat 
  curved 
  in 
  front 
  ; 
  it 
  is 
  about 
  

   0*18 
  mm. 
  across; 
  it 
  has 
  no 
  lenticles, 
  a 
  pair 
  of 
  short 
  hairs 
  

   near 
  the 
  front 
  and 
  a 
  shghtly 
  longer 
  pair 
  further 
  back 
  

   and 
  wdder 
  apart. 
  

  

  There 
  are 
  several 
  hairs 
  in 
  front 
  of 
  the 
  plate 
  and 
  a 
  pair 
  

   behind 
  it, 
  and 
  three 
  or 
  four 
  in 
  front 
  of 
  the 
  spiracle 
  and 
  a 
  

   little 
  group 
  of 
  five 
  almost 
  in 
  a 
  vertical 
  row 
  behind 
  it. 
  

   On 
  the 
  mesothorax 
  dorsally 
  are, 
  on 
  each 
  side, 
  an 
  anterior 
  

   and 
  two 
  posterior 
  hairs, 
  the 
  latter 
  close 
  together, 
  the 
  

   outer 
  the 
  shorter. 
  On 
  the 
  metathorax 
  there 
  are 
  a 
  longer 
  

   inner 
  and 
  shorter 
  outer 
  hair 
  on 
  each 
  side 
  of 
  the 
  dorsum, 
  

   a 
  minute 
  hair 
  behind 
  these 
  at 
  posterior 
  margin, 
  and 
  a 
  

   lateral 
  hair 
  ranging 
  with 
  abdominal 
  supra-spiracular 
  hairs. 
  

   On 
  the 
  abdominal 
  segments 
  there 
  is 
  a 
  long 
  dorsal 
  hair 
  

   (about 
  0*07 
  mm. 
  long), 
  a 
  shorter 
  one 
  a 
  little 
  outside 
  this, 
  

   and 
  a 
  minute 
  one 
  at 
  posterior 
  margin. 
  Above 
  the 
  spiracle 
  

   is 
  a 
  hair 
  about 
  0"03 
  mm. 
  long, 
  and 
  a 
  shorter 
  one 
  behind 
  and 
  a 
  

   Uttle 
  above 
  it. 
  The 
  9th 
  abdominal 
  segment 
  has 
  no 
  dorsal 
  

   hairs 
  but 
  an 
  anal 
  plate 
  ; 
  the 
  10th 
  has 
  about 
  ten 
  marginal 
  

   hairs. 
  

  

  Below 
  the 
  spiracles 
  are 
  the 
  usual 
  three 
  hairs 
  (four 
  in 
  

   2nd 
  and 
  3rd 
  thoracic). 
  There 
  is 
  a 
  lenticle 
  below 
  the 
  first 
  

   spiracle 
  ; 
  there 
  is 
  also 
  one 
  just 
  below 
  the 
  dorsal 
  hairs 
  on 
  the 
  

   3rd 
  (sometimes 
  2nd) 
  to 
  8th 
  abdominal 
  segments. 
  The 
  

   spiracles 
  are 
  exceedingly 
  large 
  and 
  the 
  first 
  is 
  at 
  the 
  top 
  of 
  

   a 
  chitinous 
  tube 
  deeper 
  than 
  the 
  width 
  of 
  the 
  spiracle 
  ; 
  the 
  

   spiracle 
  seems 
  to 
  be 
  level 
  with 
  the 
  cutaneous 
  surface, 
  and 
  

   not, 
  as 
  the 
  tube 
  suggests 
  at 
  first 
  glance, 
  at 
  the 
  top 
  of 
  an 
  

   exterior 
  column, 
  ^. 
  e. 
  the 
  tube 
  is 
  the 
  first 
  j)ortion 
  of 
  the 
  

   trachea. 
  The 
  true 
  legs 
  are 
  tinted, 
  but 
  much 
  paler 
  than 
  the 
  

   head. 
  The 
  prolegs 
  have 
  each 
  an 
  anterior 
  and 
  posterior 
  

   set 
  of 
  hooks, 
  each 
  set 
  consists 
  of 
  a 
  larger 
  and 
  a 
  smaller 
  

   hook, 
  of 
  which 
  the 
  smaller 
  is 
  sometimes 
  wanting. 
  The 
  

   claspers 
  in 
  one 
  specimen 
  had 
  one 
  hook 
  in 
  each 
  set 
  on 
  one 
  

   side, 
  on 
  the 
  other 
  side 
  one 
  set 
  had 
  one, 
  the 
  other 
  two 
  hooks. 
  

  

  Li 
  the 
  2nd 
  instar 
  the 
  larva 
  is 
  about 
  3 
  mm. 
  long 
  and 
  has 
  

   acquired 
  the 
  red 
  (or 
  red-brown) 
  colour, 
  but 
  it 
  is 
  hardly 
  as 
  

   dark 
  as 
  in 
  the 
  two 
  following 
  instars. 
  The 
  primary 
  setae 
  

   (dorsal 
  and 
  lateral) 
  that 
  exist 
  in 
  the 
  first 
  and 
  in 
  the 
  last 
  

  

  