﻿i6 
  Mr. 
  Cameron 
  on 
  

  

  second 
  a 
  little 
  beyond 
  the 
  second 
  transverse 
  cubital 
  nervure 
  ; 
  

   the 
  nervures 
  fuscous. 
  

  

  The 
  $ 
  has 
  the 
  clypeus 
  at 
  the 
  apex 
  broadly 
  rounded 
  ; 
  the 
  

   black 
  on 
  the 
  second 
  abdominal 
  segment 
  is 
  more 
  extended 
  ^ 
  

   the 
  fifth 
  segment 
  is 
  black 
  and 
  the 
  sixth 
  yellow 
  ; 
  the 
  pygidial 
  

   area 
  is 
  punctured 
  strongly, 
  narrowed 
  a 
  little 
  at 
  the 
  base, 
  and 
  

   with 
  the 
  apex 
  transverse. 
  Length 
  7 
  — 
  8 
  mm. 
  

  

  This 
  species 
  is 
  represented 
  by 
  numerous 
  examples 
  of 
  both 
  

   sexes, 
  and 
  it 
  appears 
  to 
  be 
  tolerably 
  constant 
  in 
  coloration. 
  

   Vischnu 
  may 
  be 
  known 
  from 
  it 
  by 
  the 
  black 
  face, 
  by 
  the 
  

   truncated 
  clypeus, 
  by 
  the 
  absence 
  of 
  yellow 
  on 
  the 
  thorax 
  

   and 
  on 
  the 
  second 
  abdominal 
  segment 
  ; 
  dentata 
  by 
  the 
  

   teeth 
  on 
  the 
  thorax. 
  

  

  ^Cerceris 
  Visciinu. 
  (PI. 
  X., 
  Fig. 
  7 
  — 
  ya, 
  b.) 
  

  

  Black 
  ; 
  the 
  scape, 
  the 
  apex 
  of 
  the 
  clypeus, 
  the 
  antennal 
  

   ridge, 
  a 
  mark 
  on 
  the 
  cheeks, 
  a 
  small 
  mark 
  on 
  the 
  sides 
  of 
  

   the 
  pronotum, 
  the 
  apex 
  of 
  the 
  third 
  abdominal 
  segment, 
  

   a 
  mark 
  in 
  the 
  centre 
  of 
  the 
  fifth, 
  the 
  four 
  anterior 
  tibije 
  in 
  

   front, 
  the 
  four 
  anterior 
  tibiae, 
  the 
  base 
  of 
  the 
  hinder, 
  pale 
  

   yellow 
  ; 
  the 
  femora 
  beneath 
  and 
  the 
  hind 
  coxae 
  rufous 
  ; 
  the 
  

   petiole 
  and 
  base 
  of 
  second 
  segment 
  ferruginous. 
  Clypeus 
  

   with 
  the 
  apex 
  projecting, 
  but 
  not 
  sharply 
  and 
  with 
  a 
  slight 
  

   incision. 
  Ocelli 
  in 
  a 
  curve 
  ; 
  the 
  posterior 
  separated 
  from 
  

   each 
  other 
  by 
  more 
  than 
  the 
  length 
  of 
  the 
  third 
  antennal 
  

   joint 
  and 
  by 
  its 
  length 
  from 
  each 
  other. 
  The 
  face 
  covered 
  

   with 
  a 
  silvery 
  pubescence, 
  the 
  rest 
  of 
  the 
  bod}' 
  with 
  pale 
  

   hair 
  ; 
  the 
  punctuation 
  close, 
  rugose. 
  Trigonal 
  area 
  not 
  

   very 
  clearly 
  defined, 
  rugosely 
  punctured. 
  Petiole 
  a 
  little 
  

   longer 
  than 
  broad 
  ; 
  pygidial 
  area 
  rugose, 
  slightly 
  narrowed 
  

   towards 
  the 
  apex, 
  which 
  is 
  bluntly 
  rounded 
  ; 
  the 
  hair 
  fringe 
  

   dense, 
  obscure 
  fulvous 
  ; 
  the 
  incision 
  in 
  hypopygium 
  a 
  little 
  

   longer 
  than 
  broad, 
  the 
  base 
  rather 
  sharply 
  pointed. 
  Wings 
  

   clear 
  hyaline, 
  the 
  apex 
  smoky 
  ; 
  the 
  second 
  cubital 
  cellule 
  

   longer 
  than 
  broad 
  ; 
  the 
  recurrent 
  nervure 
  received 
  shortly 
  

  

  