﻿452 
  Dr. 
  T. 
  A. 
  Chapman's 
  Contributions 
  to 
  

  

  and 
  that 
  the 
  palUd 
  appearance 
  is 
  due 
  to 
  air 
  between 
  the 
  

   effete 
  and 
  the 
  new 
  skin. 
  

  

  When 
  I 
  first 
  saw 
  such 
  a 
  larva, 
  I 
  said 
  this 
  larva 
  tried 
  to 
  

   moult, 
  but 
  failed 
  and 
  died 
  before 
  it 
  had 
  made 
  much 
  pro- 
  

   gress. 
  Some 
  twenty-four 
  hours 
  after 
  — 
  -and 
  I 
  beheve, 
  

   usually, 
  after 
  a 
  longer 
  period, 
  but 
  the 
  point 
  could 
  not 
  be 
  

   tested 
  with 
  the 
  amount 
  of 
  material 
  I 
  had, 
  whose 
  destruction 
  

   I 
  feared 
  to 
  risk 
  — 
  the 
  moult 
  is 
  completed, 
  the 
  larva 
  creeps 
  

   out, 
  hardly 
  disturbing 
  the 
  seedpod 
  pushed 
  aside 
  to 
  allow 
  

   of 
  its 
  escape. 
  It 
  is 
  now 
  ready 
  to 
  leave 
  the 
  plant 
  in 
  order 
  

   to 
  meet 
  with 
  ants. 
  On 
  examining 
  the 
  head 
  that 
  is 
  left, 
  

   the 
  cavity 
  is 
  seen 
  to 
  be 
  fined 
  with 
  the 
  cast 
  skin, 
  which 
  

   can, 
  with 
  some 
  care, 
  be 
  removed 
  in 
  the 
  form 
  of 
  a 
  complete 
  

   skin 
  fully 
  distended 
  ; 
  not 
  quite 
  complete, 
  however, 
  as 
  the 
  

   larva 
  escaped 
  from 
  it 
  by 
  pushing 
  off 
  the 
  head 
  and 
  a 
  portion 
  

   of 
  the 
  prothorax, 
  which 
  are 
  apt 
  to 
  be 
  lost 
  in 
  looking 
  for 
  

   the 
  cavity 
  containing 
  the 
  skin. 
  

  

  A 
  good 
  many 
  Lycaenidae 
  leave 
  their 
  first 
  cast 
  skins 
  

   fully 
  distended, 
  and 
  some 
  even 
  a 
  later 
  one, 
  but 
  the 
  process 
  

   of 
  freeing 
  itself 
  from 
  the 
  skin, 
  and 
  to 
  a 
  slight 
  degree 
  begin- 
  

   ning 
  the 
  moult 
  and 
  then 
  resting 
  for 
  a 
  day 
  or 
  two, 
  as 
  L. 
  

   euphemus 
  does, 
  is 
  a 
  puzzling 
  novelty. 
  

  

  Is 
  it 
  a 
  rest 
  in 
  order 
  to 
  await 
  suitable 
  weather 
  for 
  adven- 
  

   turing 
  on 
  a 
  new 
  world 
  ? 
  Is 
  it 
  foregone, 
  if 
  conditions 
  are 
  

   quite 
  suitable 
  when 
  the 
  process 
  is 
  begun 
  ? 
  Possibly 
  Mr. 
  

   Powell 
  may 
  have 
  some 
  details 
  throwing 
  fight 
  on 
  the 
  

   meaning 
  of 
  this 
  most 
  unusual 
  habit. 
  

  

  In 
  the 
  2nd, 
  3rd 
  and 
  4th 
  instars 
  the 
  larva 
  is 
  of 
  red 
  or 
  

   red-brown 
  colour 
  closely 
  matching 
  the 
  colour 
  of 
  the 
  flower- 
  

   heads 
  of 
  the 
  Sanguisorba. 
  In 
  the 
  2nd 
  and 
  3rd 
  instars 
  the 
  

   armature 
  is 
  of 
  simple 
  hairs 
  with 
  some 
  lenticles. 
  In 
  the 
  

   4th 
  stage 
  the 
  hairs 
  are 
  reduced 
  to 
  a 
  series 
  on 
  each 
  side 
  of 
  

   the 
  dorsum 
  and 
  a 
  lateral 
  series 
  below 
  the 
  spiracles, 
  one 
  or 
  

   two 
  to 
  a 
  segment 
  ; 
  these 
  hairs 
  are 
  0'6 
  mm. 
  long, 
  below 
  the 
  

   lateral 
  flange 
  there 
  are 
  more 
  numerous 
  and 
  shorter 
  hairs. 
  

   The 
  hairs 
  that 
  were 
  (comparatively) 
  so 
  numerous 
  in 
  the 
  

   previous 
  instars 
  are 
  replaced 
  by 
  stellate 
  hair-bases 
  set, 
  

   one 
  might 
  say, 
  as 
  closely 
  together 
  as 
  there 
  is 
  room 
  for; 
  

   some 
  of 
  these 
  seem 
  to 
  be 
  mere 
  bases, 
  some 
  lenticles, 
  but 
  

   some 
  carry 
  short 
  thick 
  processes, 
  about 
  as 
  long 
  as 
  they 
  

   are 
  wnde 
  and 
  that 
  are, 
  of 
  course, 
  morphologically, 
  hairs. 
  

   This 
  larva 
  is, 
  of 
  course, 
  no 
  larger 
  than 
  it 
  was 
  in 
  the 
  3rd 
  

   instar; 
  it 
  is 
  about 
  4" 
  5 
  mm., 
  though 
  they 
  vary 
  a 
  little 
  in 
  

   size 
  : 
  thev 
  do 
  no 
  eating 
  till 
  in 
  the 
  ants' 
  nest. 
  Seen 
  from 
  

  

  