﻿34 
  Cameron, 
  Hymenoptera 
  Orientalia. 
  

  

  incline 
  to 
  rufous. 
  Wings 
  clear 
  hyaline, 
  the 
  stigma 
  

   and 
  nervures 
  fuscous 
  ; 
  the 
  apical 
  abscissa 
  of 
  the 
  radius 
  

   straight, 
  oblique 
  ; 
  the 
  appendicular 
  cellule 
  incomplete 
  

   at 
  the 
  apex. 
  Abdomen 
  nearly 
  as 
  long 
  as 
  the 
  head 
  

   and 
  thorax 
  united 
  ; 
  the 
  petiole 
  slightly 
  longer 
  than 
  

   the 
  second 
  segment, 
  narrowed 
  at 
  the 
  base, 
  gradually 
  

   widened 
  towards 
  the 
  apex 
  ; 
  the 
  apical 
  segments 
  thickly 
  

   covered 
  with 
  a 
  white 
  pubescence 
  ; 
  the 
  pygidial 
  area 
  

   smooth, 
  except 
  for 
  a 
  double 
  row 
  of 
  five 
  large, 
  round 
  

   punctures 
  down 
  the 
  outer 
  side 
  of 
  the 
  centre 
  ; 
  the 
  sides 
  

   keeled 
  ; 
  the 
  ventral 
  segments 
  shining, 
  the 
  apices 
  of 
  the 
  

   segments 
  pale 
  piceous 
  ; 
  the 
  apical 
  half 
  of 
  the 
  hypopygium 
  

   punctured. 
  

  

  Note. 
  — 
  I 
  have 
  stated 
  above 
  that 
  only 
  one 
  Ceylonese 
  species 
  

   of 
  Crabro 
  is 
  recorded 
  by 
  Col. 
  Bingham 
  in 
  his 
  Manual 
  ; 
  but 
  

   he 
  has 
  omitted 
  from 
  that 
  work 
  all 
  mention 
  of 
  Dasyprocius 
  

   ceylonicus 
  Saussure, 
  described 
  from 
  Ceylon 
  in 
  the 
  Keise 
  der 
  

   Novara 
  ; 
  Hymen, 
  p. 
  8j, 
  pi. 
  iv. 
  f. 
  ji. 
  Dasyproctus 
  is 
  a 
  Crabro 
  

   with 
  a 
  very 
  long, 
  narrow 
  petiole, 
  not 
  dilated 
  towards 
  the 
  apex, 
  

   as 
  it 
  is 
  in 
  Rhopalum. 
  It 
  is 
  regarded 
  by 
  Kohl 
  in 
  his 
  generic 
  

   revision 
  as 
  a 
  section 
  of 
  Crabro 
  only. 
  

  

  Crabro 
  revelatus, 
  sp. 
  nov. 
  

  

  Long, 
  to 
  apex 
  of 
  petiole 
  6 
  mm. 
  (in 
  C. 
  taprobance 
  it 
  is 
  

   7 
  mm.). 
  

  

  Hub. 
  Trincomali, 
  Ceylon 
  ( 
  Yerbury). 
  

  

  Comes 
  near 
  to 
  C. 
  taprobana?, 
  and, 
  like 
  that 
  species, 
  

   has 
  an 
  elongate 
  petiole, 
  but 
  here 
  it 
  is 
  more 
  slender; 
  it 
  

   differs 
  further 
  in 
  the 
  post-scutellum 
  being 
  coarsely 
  longi- 
  

   tudinally 
  striated; 
  in 
  the 
  vertex 
  at 
  the 
  edge 
  of 
  the 
  frontal 
  

   depression 
  being 
  distinctly 
  margined 
  ; 
  and 
  in 
  the 
  furrow 
  

   on 
  the 
  middle 
  of 
  the 
  apex 
  of 
  the 
  median 
  segment 
  being 
  

   wider. 
  

  

  Scape 
  of 
  antennae 
  lemon-yellow, 
  shining, 
  glabrous; 
  

   the 
  flagellum 
  black, 
  sparsely 
  covered 
  with 
  a 
  pale 
  down 
  ; 
  

   the 
  second 
  joint 
  yellow 
  beneath 
  ; 
  the 
  third 
  only 
  very 
  little 
  

  

  