﻿New 
  Species 
  of 
  Strepsipterous 
  Insects. 
  133 
  

  

  usually 
  present 
  themselves 
  in 
  a 
  converse 
  position, 
  with 
  the 
  dorsal 
  

   region 
  upwards 
  ; 
  the 
  back 
  of 
  tlie 
  parasite 
  in 
  the 
  former 
  case 
  being 
  

   turned 
  towards 
  the 
  back 
  of 
  the 
  wasp, 
  and 
  in 
  the 
  latter 
  case 
  the 
  

   ventral 
  surface 
  of 
  the 
  parasite 
  resting 
  on 
  the 
  back 
  of 
  the 
  bee. 
  

  

  On 
  the 
  other 
  hand, 
  from 
  the 
  corresponding 
  indications 
  in 
  the 
  

   opercula 
  of 
  Xenos 
  and 
  Hyleclhrus, 
  and 
  from 
  a 
  comparison 
  of 
  the 
  

   projecting 
  hood 
  of 
  the 
  prothorax 
  in 
  the 
  pupa-cases 
  of 
  the 
  former 
  

   with 
  the 
  analogous 
  vaulted 
  orifice 
  in 
  the 
  females, 
  &c., 
  it 
  is 
  scarcely 
  

   questionable 
  that 
  the 
  relative 
  position 
  of 
  the 
  whole 
  of 
  these 
  para- 
  

   sites 
  on 
  emerging 
  from 
  the 
  abdominal 
  folds 
  is 
  uniform 
  in 
  all 
  cases, 
  

   unless 
  when 
  protruded 
  from 
  the 
  ventral 
  segments 
  of 
  their 
  victim. 
  

  

  Upon 
  examining 
  the 
  orifice 
  of 
  the 
  pupa-case 
  of 
  Xeuos 
  Rossii, 
  

   presented 
  to 
  the 
  Society 
  (No. 
  2), 
  from 
  which 
  the 
  operculum 
  has 
  

   been 
  separated, 
  a 
  sharp 
  angular 
  prolongation 
  bent 
  upwards 
  is 
  

   visible 
  on 
  the 
  inferior 
  margin, 
  as 
  if 
  the 
  abdominal 
  segments 
  of 
  

   the 
  wasp, 
  between 
  which 
  the 
  parasite 
  had 
  penetrated, 
  had 
  exer- 
  

   cised 
  too 
  stringent 
  a 
  pressure 
  upon 
  the 
  under 
  side 
  of 
  the 
  pro- 
  

   thorax, 
  thereby 
  interfering 
  with 
  the 
  aperture, 
  which 
  is 
  rather 
  

   oblong 
  than 
  circular, 
  and 
  bipartite 
  in 
  consequence 
  of 
  the 
  bent 
  up 
  

   prolongation 
  mentioned 
  above, 
  which 
  must 
  considerably 
  impede 
  

   the 
  egress 
  of 
  the 
  imago, 
  as 
  experienced 
  by 
  myself 
  on 
  one 
  occasion 
  

   when 
  endeavouring 
  to 
  extract 
  from 
  the 
  pupa-case 
  the 
  male 
  of 
  

   Xenos 
  Heydenii 
  after 
  death. 
  

  

  No 
  such 
  obstacle 
  is 
  encountered 
  in 
  the 
  pupa-cases 
  of 
  Hylec- 
  

   lhrus, 
  where 
  the 
  orifice 
  retains 
  the 
  original 
  circular 
  form 
  of 
  the 
  

   full 
  fed 
  larva, 
  and 
  the 
  nymphs 
  are 
  found 
  with 
  the 
  ventral 
  region 
  

   downwards, 
  although 
  I 
  once 
  observed 
  in 
  a 
  reversed 
  position 
  a 
  

   male 
  of 
  H. 
  rubi, 
  which 
  had 
  perished 
  when 
  in 
  the 
  act 
  of 
  divesting 
  

   itself 
  from 
  the 
  pellicle 
  of 
  the 
  nymph. 
  

  

  The 
  following 
  inferences 
  would 
  appear 
  to 
  be 
  deducible 
  from 
  the 
  

   above 
  recited 
  facts 
  : 
  namely, 
  

  

  1. 
  That 
  the 
  pupa- 
  cases 
  of^ 
  the 
  males 
  in 
  Xenos 
  and 
  Hyleclhrus, 
  

   &c. 
  correspond 
  in 
  position. 
  

  

  2. 
  That 
  the 
  position 
  of 
  the 
  perfect 
  males 
  on 
  emerging 
  usually 
  

   differs 
  in 
  Xenos 
  and 
  Hyleclhrus. 
  

  

  3. 
  That 
  one 
  or 
  other 
  must 
  therefore 
  turn 
  within 
  the 
  pupa-case, 
  

   a 
  faculty 
  which 
  both 
  appear 
  to 
  possess 
  as 
  nymphs. 
  

  

  4. 
  That 
  the 
  females 
  of 
  all 
  Strepsipterous 
  parasites 
  obviously 
  

   coincide 
  in 
  position. 
  

  

  5. 
  That 
  in 
  the 
  pseudo-jmpa 
  state 
  the 
  males 
  and 
  females 
  protrude 
  

   between 
  the 
  abdominal 
  segments 
  of 
  their 
  victims 
  in 
  a 
  similar 
  

   position. 
  

  

  6. 
  That 
  it 
  would 
  therefore 
  seem 
  scarcely 
  doubtful 
  that 
  the 
  

  

  