﻿120 
  Mr. 
  J. 
  W. 
  Douglas 
  on 
  the 
  

  

  thorax 
  of 
  the 
  perfect 
  insect. 
  These 
  larvae 
  mine 
  in 
  the 
  leaves 
  of 
  

   many 
  plants 
  ; 
  some 
  species 
  on 
  the 
  upper 
  and 
  some 
  on 
  the 
  under- 
  

   side 
  ; 
  each 
  kind, 
  however, 
  keeping 
  invariably 
  to 
  one 
  side, 
  and 
  

   having 
  its 
  own 
  characteristic 
  method 
  of 
  working, 
  and 
  each 
  indi- 
  

   vidual 
  passing 
  its 
  whole 
  life 
  in 
  one 
  leaf 
  When 
  first 
  the 
  larva 
  

   begins 
  to 
  feed 
  on 
  the 
  parenchyma, 
  it 
  loosens 
  the 
  cuticle, 
  which 
  on 
  

   this 
  spot 
  then 
  appears 
  as 
  a 
  whitish 
  film 
  : 
  it 
  soon, 
  however, 
  con- 
  

   tracts 
  into 
  folds, 
  the 
  colour 
  becomes 
  darker, 
  and 
  as 
  the 
  hollowing 
  

   process 
  proceeds 
  beneath 
  it, 
  the 
  leaf 
  contracts, 
  and 
  curves, 
  more 
  

   or 
  less, 
  forming 
  a 
  spacious 
  tenement 
  for 
  the 
  miner, 
  whose 
  age 
  

   may 
  be 
  known 
  by 
  the 
  appearance 
  of 
  its 
  dwelling. 
  The 
  means 
  by 
  

   which 
  it 
  accomplishes 
  its 
  purpose 
  have 
  been 
  described 
  by 
  

   Reaumur 
  (vide 
  ante, 
  p. 
  102.) 
  Of 
  many, 
  perhaps 
  of 
  all 
  species, 
  

   there 
  are 
  two 
  broods 
  in 
  a 
  year. 
  

  

  When 
  about 
  to 
  change 
  to 
  a 
  pupa, 
  the 
  body 
  of 
  the 
  larva 
  becomes 
  

   contracted, 
  and 
  of 
  a 
  clearer 
  colour, 
  having 
  been 
  cleansed 
  of 
  all 
  

   remains 
  of 
  food. 
  The 
  change 
  always 
  takes 
  place 
  within 
  the 
  

   mined 
  place 
  ; 
  in 
  some 
  cases, 
  within 
  a 
  silken 
  cocoon, 
  made 
  by 
  the 
  

   larva; 
  in 
  others, 
  the 
  pupa 
  is 
  loose. 
  When 
  the 
  imago 
  escapes, 
  the 
  

   pupa-skin 
  is 
  left 
  projecting 
  through 
  the 
  skin 
  of 
  the 
  leaf. 
  

  

  The 
  characters 
  of 
  the 
  genus 
  are 
  laid 
  down 
  by 
  Zeller, 
  in 
  the 
  

   " 
  Linneea 
  Entoraologica," 
  (Band. 
  I., 
  167, 
  1846) 
  ; 
  and 
  descriptions 
  

   are 
  given 
  of 
  all 
  the 
  then 
  known 
  species. 
  In 
  Curtis's 
  " 
  British 
  Ento- 
  

   mology," 
  all 
  the 
  British 
  species 
  are 
  placed 
  in 
  the 
  genus 
  Argyromigcs, 
  

   but 
  unfortunately 
  the 
  author 
  has 
  drawn 
  its 
  characters 
  from 
  

   auiumncUa 
  [T. 
  Clerckella, 
  L 
  ), 
  which 
  differs 
  from 
  the 
  species 
  

   with 
  which 
  it 
  is 
  there 
  associated, 
  in 
  the 
  form 
  and 
  neuration 
  of 
  

   its 
  wings, 
  in 
  the 
  enlarged 
  basal 
  joint 
  of 
  the 
  antennae, 
  in 
  the 
  larva 
  

   iiaving 
  sixteen 
  feet, 
  and 
  in 
  its 
  habit 
  of 
  quitting 
  the 
  leaf 
  it 
  has 
  

   mined, 
  previous 
  to 
  forming 
  its 
  suspended 
  cocoon, 
  so 
  that 
  it 
  cannot 
  

   stand 
  as 
  the 
  representative 
  of 
  a 
  genus 
  whose 
  larvae 
  have 
  but 
  

   fourteen 
  feet, 
  and 
  change 
  to 
  the 
  pupa 
  state 
  within 
  the 
  substance 
  

   of 
  leaves. 
  

  

  Lifhocolletis 
  trifascic/ia, 
  Haworth, 
  Stainton. 
  (Zool. 
  2088.) 
  

   Larva 
  (PL 
  XIII. 
  fig. 
  I 
  a). 
  — 
  Length 
  2| 
  lines. 
  — 
  Citron 
  yellow, 
  

   shining, 
  transparent, 
  hairy, 
  with 
  a 
  green 
  dorsal 
  stripe. 
  Head 
  of 
  a 
  

   more 
  dull 
  yellow, 
  mouth 
  brown. 
  Six 
  pectoral, 
  six 
  ventral, 
  and 
  

   two 
  anal 
  legs 
  yellowish. 
  The 
  upper 
  surface 
  of 
  the 
  segment 
  

   bearing 
  the 
  last 
  pair 
  of 
  ventral 
  legs 
  is 
  orange. 
  

  

  Mines 
  the 
  underside 
  of 
  the 
  leaves 
  of 
  honeysuckle 
  (Loniccra 
  

   pcriclymmuin), 
  the 
  skin 
  of 
  which 
  it 
  wrinkles 
  and 
  detaches, 
  

   forming 
  a 
  small 
  pouch, 
  in 
  which 
  it 
  lives 
  and 
  feeds 
  on 
  the 
  

  

  