﻿130 
  Mr. 
  S. 
  S. 
  Saunders's 
  Notices 
  of 
  some 
  

  

  the 
  eyes. 
  The 
  eye-shades 
  are 
  found 
  to 
  present 
  at 
  the 
  time 
  of 
  

   exit 
  the 
  usual 
  fenestrated 
  disc, 
  consisting 
  of 
  a 
  number 
  of 
  minute 
  

   transparences 
  disposed 
  in 
  regular 
  rows. 
  In 
  the 
  course 
  of 
  a 
  few 
  

   hours 
  the 
  pupa-case 
  assumes 
  a 
  light 
  castaneous 
  tinge, 
  which 
  con- 
  

   tinues 
  gradually 
  darkening 
  as 
  the 
  occult 
  nymph 
  approaches 
  ma- 
  

   turity, 
  until 
  at 
  length 
  discarding 
  its 
  slender 
  pellicle, 
  and 
  advancing 
  

   from 
  its 
  previous 
  retractile 
  position 
  closer 
  to 
  the 
  operculum, 
  the 
  

   black 
  head 
  from 
  within 
  produces 
  a 
  darkening 
  effect 
  upon 
  the 
  

   whole. 
  If 
  previously 
  to 
  this 
  moment 
  a 
  needle 
  be 
  passed 
  trans- 
  

   versely 
  through 
  the 
  operculum, 
  the 
  nymph 
  remains 
  uninjured 
  

   thereby, 
  nor 
  does 
  the 
  removal 
  of 
  the 
  operculum 
  leave 
  the 
  head 
  

   prominently 
  exposed. 
  When 
  the 
  operculum 
  has 
  retained 
  a 
  cas- 
  

   taneous 
  tinge, 
  and 
  not 
  separated 
  readily 
  on 
  pressure, 
  the 
  parasite 
  

   may 
  be 
  considered 
  as 
  still 
  immature 
  ; 
  or 
  should 
  the 
  bee 
  die 
  before 
  

   the 
  parasite 
  is 
  well 
  advanced 
  towards 
  its 
  ultimate 
  metamorphosis, 
  

   the 
  latter 
  may 
  be 
  expected 
  to 
  perish, 
  from 
  the 
  want 
  of 
  the 
  accus- 
  

   tomed 
  moisture 
  ; 
  nor 
  indeed, 
  if 
  in 
  a 
  more 
  forward 
  state, 
  does 
  it 
  

   appear 
  able 
  to 
  accomplish 
  its 
  final 
  moult 
  under 
  such 
  circumstances, 
  

   remaining 
  therefore 
  perfect 
  in 
  all 
  its 
  parts, 
  but 
  still 
  enveloped 
  in 
  

   the 
  pellicle 
  of 
  the 
  nymph. 
  

  

  h. 
  Of 
  the 
  Female. 
  

  

  When 
  first 
  porrected 
  from 
  the 
  abdomen 
  of 
  the 
  bee, 
  the 
  cepha- 
  

   lothorax 
  of 
  the 
  female 
  Hylecthrus 
  is 
  nearly 
  diaphanous, 
  with 
  a 
  

   piceous 
  marginal 
  induration, 
  corresponding 
  anteriorly 
  with 
  the 
  

   proboscis 
  in 
  the 
  operculum 
  of 
  the 
  male, 
  the 
  deflexion 
  of 
  which 
  in 
  

   both 
  would 
  appear 
  to 
  indicate 
  a 
  similarity 
  in 
  the 
  position 
  and 
  pro- 
  

   ceedings 
  of 
  the 
  larvae 
  prior 
  to 
  egress. 
  

  

  The 
  convex 
  shield 
  on 
  the 
  upper 
  surface 
  exhibits 
  anteriorly 
  two 
  

   glossy 
  protuberances 
  seated 
  in 
  an 
  angular 
  recess 
  on 
  each 
  side 
  of 
  

   the 
  disc, 
  being 
  at 
  first 
  of 
  a 
  brown 
  colour, 
  which 
  afterwards 
  disap- 
  

   pears 
  by 
  the 
  dispersion 
  of 
  the 
  subjacent 
  humours, 
  leaving, 
  how- 
  

   ever, 
  the 
  site 
  more 
  transparent. 
  On 
  the 
  lateral 
  margin, 
  at 
  the 
  

   extreme 
  corners 
  of 
  the 
  occipital 
  suture 
  beneath 
  the 
  shield, 
  are 
  two 
  

   piceous 
  tubercles, 
  occupying 
  the 
  place 
  of 
  the 
  eyes 
  ; 
  the 
  discal 
  

   shield 
  extending 
  at 
  first 
  in 
  close 
  proximity 
  to 
  the 
  indurated 
  

   piceous 
  apex 
  of 
  the 
  cephalothorax, 
  where, 
  shortly 
  after 
  protru- 
  

   sion, 
  a 
  separation 
  is 
  effected 
  in 
  the 
  natural 
  course 
  of 
  development, 
  

   whence 
  the 
  upper 
  region 
  of 
  the 
  true 
  head 
  becomes 
  partially 
  ex- 
  

   posed. 
  The 
  superior 
  lip, 
  broad 
  and 
  rounded 
  at 
  the 
  sides, 
  tra- 
  

   versed 
  at 
  the 
  base 
  by 
  a 
  delicate 
  sutural 
  line, 
  is 
  furnished 
  in 
  the 
  

   centre 
  with 
  a 
  small 
  quadrate 
  emargiiiate 
  plate, 
  having 
  on 
  each 
  

   side 
  a 
  kind 
  of 
  obtuse 
  palpiform 
  process, 
  terminating 
  in 
  a 
  glossy 
  

  

  