﻿104 
  Ml. 
  J. 
  W. 
  Douglas 
  on 
  the 
  

  

  tinted 
  with 
  greenish 
  ; 
  the 
  colour 
  of 
  the 
  contents 
  of 
  their 
  stomach 
  

   and 
  intestines 
  may 
  probably 
  give 
  this 
  tint 
  to 
  their 
  transparent 
  skin. 
  

   It 
  would 
  not 
  be 
  safe 
  to 
  decide 
  that 
  these 
  three 
  larvae 
  belong 
  to 
  

   the 
  same 
  or 
  different 
  species, 
  if 
  the 
  insects 
  into 
  which 
  they 
  changed 
  

   did 
  not 
  show 
  it, 
  and 
  if 
  we 
  could 
  not 
  say 
  that 
  the 
  mode 
  of 
  preparing 
  

   for 
  their 
  metamorphosis 
  is 
  different. 
  If 
  in 
  the 
  month 
  of 
  October 
  

   we 
  remove 
  the 
  epidermis 
  that 
  has 
  been 
  folded 
  by 
  one 
  of 
  the 
  apple 
  

   leaf 
  miners, 
  we 
  find 
  a 
  chrysalis 
  which 
  has 
  not 
  been 
  enclosed 
  in 
  a 
  

   cocoon. 
  If 
  at 
  the 
  same 
  time 
  we 
  open 
  the 
  mined 
  part 
  of 
  an 
  oak 
  

   leaf 
  we 
  also 
  find 
  a 
  chrysalis, 
  but 
  enclosed 
  in 
  a 
  small 
  cocoon 
  of 
  

   fine 
  white 
  silk, 
  to 
  fortify 
  which 
  the 
  larva 
  has 
  covered 
  the 
  exterior 
  

   with 
  its 
  excrement." 
  

  

  Note. 
  — 
  It 
  is 
  not 
  possible 
  to 
  identify 
  with 
  precision 
  Reaumur's 
  

   oak 
  miner 
  ; 
  the 
  pupa 
  of 
  several 
  species 
  of 
  Lithocolletis 
  that 
  feed 
  on 
  

   the 
  oak 
  is 
  enclosed 
  in 
  a 
  cocoon 
  covered 
  with 
  excrement 
  as 
  he 
  

   mentions 
  : 
  his 
  figure 
  of 
  the 
  imago 
  would 
  appear 
  to 
  indicate 
  

   L 
  Cramerella. 
  

  

  " 
  Finally, 
  if 
  we 
  open 
  the 
  mined 
  part 
  of 
  the 
  elm 
  leaf 
  we 
  find 
  a 
  

   very 
  small 
  but 
  pretty 
  silky 
  cocoon, 
  which 
  has 
  on 
  a 
  small 
  scale 
  the 
  

   form 
  of 
  the 
  cocoon 
  of 
  the 
  silkworm 
  3 
  it 
  is 
  however 
  rather 
  more 
  

   elongated 
  and 
  more 
  pointed. 
  The 
  colour 
  of 
  the 
  silk 
  of 
  these 
  

   cocoons 
  is 
  not 
  of 
  the 
  ordinary 
  colour, 
  it 
  is 
  of 
  a 
  bluish-green." 
  

  

  iVo/e. 
  — 
  Zeller 
  had 
  here 
  suspected 
  Lithocolletis 
  Klecmannella, 
  

   but 
  the 
  proofs 
  are 
  so 
  strong 
  for 
  Schreberella 
  that 
  I 
  have 
  no 
  hesi- 
  

   tation 
  in 
  pronouncing 
  that 
  to 
  be 
  the 
  species, 
  the 
  greenish-blue 
  

   cocoon 
  giving 
  a 
  climax 
  to 
  this 
  supposition. 
  

  

  " 
  Among 
  the 
  miners 
  of 
  which 
  we 
  speak 
  some 
  go 
  into 
  pupa 
  in 
  

   June 
  or 
  July, 
  and 
  it 
  was 
  only 
  to 
  point 
  out 
  the 
  time 
  when 
  most 
  are 
  

   to 
  be 
  found, 
  that 
  we 
  said 
  they 
  should 
  be 
  looked 
  for 
  towards 
  the 
  

   end 
  of 
  October 
  ; 
  when 
  the 
  leaves 
  fall, 
  the 
  chrysalides 
  which 
  are 
  

   in 
  the 
  leaves 
  fall 
  with 
  them. 
  Those 
  which 
  are 
  enclosed 
  in 
  cocoons 
  

   are 
  at 
  least 
  in 
  some 
  degree 
  sheltered, 
  when 
  the 
  leaf 
  decays; 
  I 
  

   know 
  not 
  v^ijether 
  the 
  others 
  are 
  able 
  to 
  resist 
  moisture, 
  or 
  whe- 
  

   ther 
  many 
  do 
  not 
  perish 
  during 
  the 
  winter. 
  

  

  " 
  I 
  have 
  omitted 
  to 
  seek 
  for 
  the 
  moth 
  of 
  a 
  miner 
  of 
  the 
  leaves 
  

   of 
  the 
  pear, 
  which 
  is 
  not 
  so 
  frequent 
  as 
  the 
  miner 
  of 
  the 
  apple 
  

   leaves. 
  It 
  folds, 
  like 
  the 
  latter, 
  the 
  epidermis 
  which 
  it 
  has 
  

   loosened 
  ; 
  it 
  has 
  also 
  fourteen 
  legs, 
  but 
  it 
  is 
  greenish 
  white, 
  

   whereas 
  the 
  miner 
  of 
  the 
  apple 
  tree 
  is 
  yellow." 
  

  

  Note. 
  — 
  It 
  is 
  probable 
  that 
  a 
  pear 
  tree 
  miner 
  would 
  not 
  differ 
  

   from 
  the 
  miner 
  of 
  an 
  apple 
  tree 
  ; 
  probably 
  in 
  this 
  case 
  Reaumur 
  

   alludes 
  to 
  the 
  upper 
  side 
  miner, 
  his 
  yellow 
  larvae 
  being 
  the 
  under 
  

   side 
  miner. 
  

  

  " 
  But 
  at 
  the 
  beginning 
  of 
  spring 
  I 
  had 
  the 
  moth 
  from 
  a 
  cater- 
  

  

  