﻿144 
  Mr. 
  S. 
  S. 
  Saunders 
  on 
  Strepsijjterous 
  Insects. 
  

  

  17. 
  Immature 
  white 
  pupa 
  of 
  male 
  parasite 
  as 
  just 
  emerged 
  

   from 
  abdomen 
  of 
  the 
  bee. 
  (With 
  newly-developed 
  Hylceiis 
  ver- 
  

   sicolor.) 
  

  

  18. 
  Pale 
  nymph 
  of 
  Hijlccthrus 
  querc&s 
  $, 
  extracted 
  from 
  the 
  

   pupa-case. 
  (Largest 
  specimen.) 
  

  

  19. 
  Pale 
  nymph 
  of 
  Hylecthrus 
  riibi 
  $, 
  the 
  wings 
  distended. 
  

   (Smaller 
  pale 
  specimen.) 
  

  

  20. 
  Nymph 
  of 
  Hijlecthrus 
  ruhi 
  ^ 
  in 
  a 
  more 
  advanced 
  state, 
  

   with 
  the 
  limbs 
  of 
  the 
  imago 
  more 
  distinctly 
  shown. 
  (The 
  larger 
  

   dark 
  specimen.) 
  

  

  21. 
  Extremity 
  of 
  body 
  o{ 
  Hylceus 
  rubicola, 
  with 
  bred 
  specimen 
  

   of 
  the 
  female 
  parasite 
  (//. 
  riibi), 
  extracted 
  entire 
  after 
  the 
  protru- 
  

   sion 
  of 
  the 
  cephalothorax. 
  

  

  " 
  DESCRIPTION 
  OF 
  PLATES.— 
  PLATE 
  XV. 
  

  

  Fig. 
  1 
  — 
  8. 
  Details 
  of 
  pseudo-nymph 
  of 
  Xenos 
  Eossii 
  $ 
  . 
  

  

  1. 
  Head-case 
  seea 
  from 
  above 
  ; 
  2, 
  sideways; 
  3, 
  from 
  front 
  ;^4, 
  from 
  wilhin; 
  

  

  5, 
  body, 
  wilh 
  head-case 
  removed 
  ; 
  6, 
  front 
  orifice, 
  showing 
  raised 
  conical 
  

   under 
  edge 
  ; 
  7, 
  one 
  of 
  the 
  spiracles 
  ; 
  8, 
  extremity 
  of 
  body 
  wrinkled, 
  

   inclosing 
  pellicle 
  of 
  true 
  pupa. 
  

  

  9. 
  Oplopus 
  rubicola, 
  Duf., 
  with 
  Xenos 
  Klugii, 
  S. 
  S. 
  S., 
  $ 
  , 
  inclosed 
  in 
  its 
  

   pupa 
  skin, 
  with 
  the 
  head 
  of 
  another 
  pseudo-nymph 
  $ 
  ; 
  10, 
  antenna 
  

   extracted 
  from 
  pupa 
  skin 
  of 
  -Y. 
  Klugii 
  $ 
  (basal 
  joints 
  not 
  clearly 
  seen) 
  ; 
  

   11, 
  head-case 
  of 
  pseudo- 
  nymph 
  $ 
  from 
  below; 
  12, 
  from 
  the 
  front; 
  

   13, 
  from 
  within 
  ; 
  14, 
  sideways; 
  15, 
  portion 
  of 
  ventral 
  surface 
  near 
  the 
  

   head-case 
  pointed 
  (accidentally?). 
  

   15. 
  A7icistrocerus 
  dejieudiis, 
  S. 
  S. 
  S., 
  with 
  Xenos 
  Heydenii, 
  S. 
  S. 
  S., 
  J 
  ; 
  16, 
  

   pseudo-nymph 
  of 
  X. 
  Heiidenii 
  $ 
  in 
  pupa 
  skiu 
  ; 
  17, 
  antenna 
  extracted 
  ; 
  

   18, 
  head-case 
  of 
  pseudo-nymph 
  $ 
  from 
  below; 
  19, 
  sideways; 
  20, 
  from 
  

   the 
  front; 
  21, 
  from 
  within 
  ; 
  22, 
  cephalothorax 
  of 
  5 
  , 
  23, 
  front 
  of 
  ditto 
  

   magnified 
  more 
  strongly 
  ; 
  24, 
  front 
  margin 
  seen 
  in 
  front. 
  

  

  PLATE 
  XVI. 
  

  

  Fig. 
  1 
  , 
  Xenos 
  Rossii 
  $ 
  escaping 
  from 
  dorsal 
  articulation 
  of 
  abdomen 
  of 
  Polistes 
  

   gallica. 
  

  

  2. 
  Hytecthrus 
  rubi.S.S.S,, 
  $, 
  escaping 
  from 
  dorsal 
  articulation 
  of 
  abdomen 
  

  

  of 
  Hylceus 
  rubicola; 
  3, 
  pupa 
  of 
  Hyl. 
  rtibi 
  $ 
  ; 
  4, 
  ditto 
  with 
  pellicle 
  

   longitudinally 
  splitting 
  preparatory 
  to 
  exit 
  ; 
  5, 
  abdomen 
  of 
  pupa 
  of 
  

   Hyl<eus, 
  with 
  terminal 
  segments 
  removed, 
  showing 
  two 
  pseudo-nymphs 
  

   of 
  Hyl. 
  ruhi 
  $ 
  not 
  previously 
  apparent 
  (eye 
  covers 
  not 
  coloured); 
  

  

  6, 
  pupa 
  of 
  HyliEus 
  with 
  pseudo-nymph 
  of 
  $ 
  parasite 
  working 
  for 
  egress, 
  

   the 
  dark 
  eye 
  shades 
  visible 
  through 
  tegument 
  of 
  bee-pupa; 
  7, 
  head- 
  

   case 
  of 
  immature 
  white 
  pupa 
  of 
  H, 
  rubi 
  $ 
  just 
  emerged 
  from 
  within 
  

   the 
  abdomen; 
  8, 
  head-case 
  sideways; 
  9, 
  front 
  of 
  head-case 
  more 
  

   magnified 
  ; 
  10, 
  extremity 
  of 
  body 
  of 
  Hyleus, 
  with 
  exuviee 
  of 
  two 
  males 
  

   of 
  Hyl. 
  ruhi 
  after 
  removal 
  of 
  their 
  head-cases 
  showing 
  oval 
  aperture 
  ; 
  

   11, 
  extremity 
  of 
  abdomen 
  of 
  Hyl. 
  rubicola, 
  with 
  Hyl. 
  ruhi 
  J 
  ; 
  12, 
  

   front 
  of 
  cephalothorax 
  5 
  ; 
  13, 
  ditto 
  seen 
  laterally; 
  14, 
  upper 
  pellicle 
  

   of 
  cephalothorax 
  of 
  2 
  removed 
  from 
  fig. 
  15, 
  which 
  thus 
  shows 
  the 
  

   thoracic 
  duct 
  covered 
  with 
  its 
  membranous 
  pellicle 
  ; 
  16, 
  cephalothorax 
  

   of 
  Hyl. 
  ruhi 
  5 
  (bred) 
  with 
  fuscous 
  markings 
  in 
  place 
  of 
  eye 
  shades 
  ; 
  

   17, 
  ditto 
  with 
  outer 
  dorsal 
  pellicle 
  of 
  upper 
  membrane 
  of 
  thoracic 
  duct 
  

   removed, 
  showing 
  articulations. 
  

  

  18. 
  Pupa 
  of 
  Hylecthrus 
  guerctis 
  $ 
  . 
  

  

  19. 
  Prosojiis 
  variegata, 
  with 
  cephalothorax 
  of 
  Hylecthrus 
  Sieholdii 
  9 
  exposed 
  ; 
  

  

  20, 
  the 
  latter 
  magnified 
  greatly, 
  showing 
  two 
  larvae 
  wilhin 
  the 
  thoracic 
  

   duct." 
  [J. 
  O. 
  W.] 
  

  

  