﻿of 
  Osmia 
  Parietina 
  and 
  other 
  British 
  Insects. 
  83 
  

  

  nkidula. 
  The 
  longicorn 
  Saperda 
  populnea 
  did 
  not 
  appear 
  until 
  

   the 
  second 
  week 
  in 
  June. 
  

  

  Many 
  Entomologists, 
  like 
  myself, 
  must 
  have 
  observed 
  towards 
  

   the 
  end 
  of 
  summer 
  those 
  little 
  cartridge-like 
  rolls 
  on 
  the 
  leaves 
  

   of 
  young 
  oaks 
  in 
  woods, 
  &c. 
  and 
  have 
  understood 
  them 
  to 
  be 
  the 
  

   production 
  of 
  Attelabus 
  curcul'iono'ides 
  ; 
  my 
  impression 
  was, 
  that 
  if 
  

   so, 
  they 
  were 
  formed 
  by 
  the 
  larvae 
  of 
  that 
  insect 
  as 
  a 
  nidus, 
  in 
  

   which 
  to 
  undergo 
  their 
  transformations. 
  I 
  have 
  now 
  succeeded 
  

   in 
  satisfying 
  myself 
  tliat 
  I 
  was 
  mistaken 
  in 
  this 
  particular, 
  — 
  they 
  

   are 
  formed 
  by 
  the 
  perfect 
  insect. 
  I 
  found 
  these 
  leaf-rolls 
  in 
  great 
  

   numbers 
  in 
  Yorkshire, 
  in 
  July, 
  also 
  the 
  perfect 
  insect; 
  and, 
  

   although 
  I 
  did 
  not 
  observe 
  them 
  in 
  the 
  act 
  of 
  rolling 
  them, 
  still, 
  

   on 
  unrolling 
  many 
  recently 
  formed, 
  I 
  found 
  an 
  egg 
  of 
  a 
  yellow 
  

   colour. 
  

  

  Last 
  year, 
  in 
  the 
  month 
  of 
  September, 
  I 
  found 
  the 
  leaf-rolls 
  

   very 
  abundant 
  in 
  a 
  wood 
  near 
  Hampstead, 
  and 
  collected 
  as 
  many 
  

   as 
  would 
  fill 
  a 
  half 
  pint 
  measure 
  ; 
  after 
  opening 
  about 
  twenty, 
  all 
  

   of 
  which 
  were 
  empty, 
  I 
  found 
  one 
  containing 
  a 
  full-grown 
  larva. 
  

   I 
  placed 
  the 
  rest 
  in 
  a 
  flowerpot, 
  on 
  mould, 
  leaving 
  them 
  exposed 
  

   to 
  the 
  weather 
  until 
  the 
  month 
  of 
  April, 
  when 
  I 
  covered 
  the 
  pot 
  

   with 
  fine 
  net, 
  and 
  about 
  the 
  middle 
  of 
  the 
  month 
  of 
  May, 
  I 
  had 
  

   several 
  specimens 
  o? 
  Attelabus 
  developed, 
  but 
  a 
  much 
  larger 
  num- 
  

   ber 
  of 
  a 
  species 
  of 
  Chalcididous 
  insect, 
  which 
  will 
  probably 
  in 
  

   some 
  measure 
  account 
  for 
  the 
  small 
  number 
  of 
  Attelabus 
  deve- 
  

   loped, 
  as 
  compared 
  with 
  the 
  number 
  of 
  cases 
  collected. 
  I 
  found 
  

   on 
  digging 
  into 
  the 
  mould 
  that 
  the 
  larva 
  had 
  buried 
  itself 
  to 
  

   undergo 
  its 
  transformations. 
  

  

  Last 
  year, 
  1851, 
  in 
  the 
  month 
  of 
  May, 
  I 
  observed 
  numbers 
  of 
  a 
  

   little 
  wood-boring 
  beetle, 
  Scolytus 
  destructor, 
  busily 
  engaged 
  in 
  

   burrowing 
  in 
  the 
  bark 
  of 
  an 
  elm 
  branch. 
  In 
  autumn 
  I 
  cut 
  off 
  a 
  

   portion, 
  in 
  order 
  that 
  I 
  might 
  observe 
  their 
  transformations 
  ; 
  on 
  

   examining 
  the 
  progress 
  of 
  the 
  insect 
  in 
  April 
  following, 
  I 
  found 
  

   the 
  beetle 
  still 
  in 
  the 
  larva 
  state. 
  At 
  the 
  extremity 
  of 
  every 
  sixth 
  

   or 
  eighth 
  gallery 
  formed 
  by 
  the 
  Scolytus, 
  I 
  observed 
  a 
  small 
  

   Hymenopterous 
  larva. 
  About 
  the 
  end 
  of 
  May 
  the 
  beetles 
  began 
  

   to 
  appear, 
  and 
  also 
  a 
  number 
  of 
  a 
  small 
  Chalcididous 
  insect, 
  — 
  

   C/teiropachus 
  quadrum. 
  

  

  From 
  another 
  piece 
  of 
  wood, 
  containing 
  the 
  larvae 
  of 
  Ptilinus 
  

   peciinicornis, 
  I 
  bred 
  numbers 
  of 
  another 
  parasite, 
  also 
  belonging 
  

   to 
  the 
  Chalcididce, 
  — 
  Caloseter 
  vernalis. 
  

  

  I 
  have 
  also, 
  again, 
  bred 
  specimens 
  of 
  a 
  species 
  of 
  Hylceus 
  from 
  

   G 
  2 
  

  

  