﻿128 
  Mr. 
  S. 
  S. 
  Saunders's 
  Notices 
  of 
  some 
  

  

  minal 
  region, 
  pn?parntory 
  to 
  their 
  iillimate 
  exit. 
  The 
  relative 
  

   direction 
  of 
  the 
  head 
  appears 
  to 
  vary 
  up 
  to 
  a 
  late 
  period, 
  even 
  

   when 
  the 
  Hylveus 
  or 
  other 
  victim 
  has 
  assumed 
  the 
  pupa 
  state. 
  

   Among 
  the 
  specimens 
  presented 
  will 
  be 
  found 
  a 
  Hijhmis 
  r.ymph, 
  

   wherein, 
  on 
  removing 
  the 
  terminal 
  segments 
  to 
  the 
  fourth, 
  exclu- 
  

   sive, 
  I 
  perceived 
  the 
  anal 
  extremity 
  of 
  a 
  Strepsipterous 
  larva 
  

   projecting. 
  On 
  separating 
  the 
  fourth 
  segment, 
  the 
  head 
  of 
  the 
  

   parasite 
  was 
  found 
  directed 
  towards 
  the 
  thorax, 
  in 
  which 
  position 
  

   it 
  is 
  still 
  retained 
  within 
  the 
  disrupted 
  segment. 
  After 
  this, 
  the 
  

   third 
  segment 
  was 
  in 
  like 
  manner 
  removed, 
  when 
  three 
  more 
  

   larvae 
  of 
  smaller 
  dimensions 
  were 
  observed 
  ; 
  one 
  of 
  which 
  was 
  

   lying 
  transversely, 
  the 
  other 
  two 
  with 
  their 
  heads 
  directed 
  

   towards 
  the 
  anal 
  extremity, 
  and 
  apparently 
  in 
  the 
  act 
  of 
  forcing 
  

   a 
  passage 
  between 
  the 
  adipose 
  tissue 
  and 
  outer 
  tegument 
  of 
  the 
  

   bee, 
  which 
  operation 
  had 
  been 
  commenced 
  higher 
  up. 
  The 
  

   whole 
  were, 
  however, 
  of 
  much 
  smaller 
  size 
  than 
  might 
  have 
  been 
  

   expected 
  at 
  this 
  period 
  of 
  their 
  growfh 
  ; 
  but 
  whether 
  in 
  con- 
  

   sequence 
  of 
  there 
  being 
  four 
  to 
  be 
  sustained 
  by 
  one 
  bee, 
  or 
  from 
  

   some 
  other 
  cause, 
  must 
  be 
  left 
  to 
  conjecture. 
  

   5. 
  Mode 
  of 
  effecting 
  Exit. 
  

   The 
  nymphs 
  of 
  those 
  Hijlcei 
  which 
  are 
  likely 
  to 
  produce 
  the 
  

   pale-coloured 
  specimens 
  (//. 
  versicolor), 
  which 
  prove, 
  as 
  antici- 
  

   pated, 
  to 
  be 
  only 
  a 
  variety 
  of 
  the 
  H. 
  rubicola 
  consequent 
  upon 
  

   parasitic 
  absorption, 
  may 
  usually 
  be 
  identified 
  within 
  one 
  or 
  two 
  

   days 
  of 
  their 
  final 
  metamorphosis, 
  by 
  assuming 
  a 
  yellow 
  tinge, 
  

   and 
  may 
  be 
  set 
  apart 
  as 
  certain 
  to 
  produce 
  male 
  parasites. 
  I 
  

   have 
  not 
  unfrequentiy 
  been 
  enabled 
  to 
  detect 
  the 
  eye-shades 
  of 
  

   the 
  latter 
  before 
  the 
  Hylceus 
  nymph 
  has 
  discarded 
  its 
  pellicle, 
  

   working 
  to 
  and 
  fro 
  beneath 
  the 
  dorsal 
  tegument 
  ; 
  although 
  more 
  

   conspicuous 
  when 
  the 
  bee 
  first 
  attains 
  the 
  imago 
  form, 
  the 
  head 
  

   of 
  the 
  parasite 
  being 
  then 
  seen 
  turning 
  from 
  side 
  to 
  side, 
  and 
  

   steadily 
  pressing 
  all 
  the 
  while 
  upon 
  the 
  rostrum, 
  as 
  the 
  axis 
  about 
  

   which 
  it 
  revolves, 
  in 
  the 
  ratio 
  of 
  one-eighth 
  of 
  a 
  circle, 
  for 
  the 
  

   purpose 
  of 
  introducing 
  this 
  between 
  the 
  abdominal 
  folds. 
  Thus 
  

   when 
  one 
  eye-shade 
  advances 
  the 
  other 
  recedes, 
  both 
  being 
  some- 
  

   times 
  carried 
  deeper 
  below, 
  when 
  the 
  greater 
  strain 
  appears 
  to 
  

   operate 
  upon 
  the 
  upheld 
  rostrum. 
  As 
  soon 
  as 
  a 
  lodgment 
  is 
  

   effected, 
  this 
  is 
  gradually 
  pushed 
  forward 
  by 
  a 
  continuation 
  of 
  the 
  

   same 
  process, 
  until 
  sufficiently 
  advanced, 
  the 
  entire 
  operation 
  

   occupying 
  from 
  one 
  hour 
  in 
  some 
  cases, 
  to 
  two 
  hours 
  in 
  others, 
  

   and 
  immediately 
  following 
  the 
  ultimate 
  transformation 
  of 
  the 
  bee 
  

   in 
  its 
  then 
  moist 
  state 
  ; 
  after 
  which 
  the 
  parasite 
  remains 
  perfectly 
  

   motionless. 
  

  

  