﻿Hymenoptera 
  Orient 
  alls. 
  17 
  

  

  before 
  the 
  middle. 
  The 
  antennae 
  have 
  the 
  flagellum 
  pale 
  

   fulvous 
  beneath 
  ; 
  the 
  eyes 
  are 
  parallel. 
  

  

  The 
  $ 
  has 
  the 
  clypeus 
  broadly 
  truncate 
  at 
  the 
  apex 
  in 
  

   the 
  middle, 
  and 
  with 
  the 
  lateral 
  laminae 
  pale 
  ; 
  the 
  clypeus 
  

   wants 
  the 
  yellow 
  mark 
  ; 
  the 
  petiole 
  is 
  black 
  ; 
  otherwise 
  as 
  

   in 
  ? 
  except 
  that 
  it 
  is 
  the 
  6th 
  abdominal 
  segment 
  which 
  is 
  

   marked 
  with 
  yellow. 
  Length 
  ? 
  nearly 
  9 
  mm 
  ; 
  $, 
  7 
  mm. 
  

  

  A 
  distinct 
  species. 
  

  

  What 
  appears 
  to 
  be 
  this 
  species 
  has 
  a 
  small 
  yellow 
  mark 
  

   at 
  the 
  base 
  of 
  the 
  abdomen, 
  the 
  petiole 
  beneath 
  and 
  later- 
  

   ally 
  and 
  the 
  base 
  of 
  the 
  second 
  segment 
  are 
  rufous 
  and 
  there 
  

   is 
  a 
  small 
  white 
  mark 
  on 
  the 
  base 
  of 
  the 
  latter. 
  

  

  Xerceris 
  tristis, 
  sp. 
  710V. 
  (PI. 
  X. 
  f 
  7, 
  a, 
  b). 
  

  

  Eyes 
  parallel. 
  Ocelli 
  not 
  forming 
  a 
  triangle 
  ; 
  the 
  posterior 
  

   separated 
  from 
  the 
  eyes 
  bynearlythe 
  lengthof 
  the 
  second 
  and 
  

   third 
  joints 
  united 
  and 
  from 
  each 
  other 
  by 
  less 
  than 
  the 
  length 
  

   of 
  the 
  third. 
  Middle 
  lobe 
  of 
  the 
  clypeus 
  convex, 
  gaping 
  at 
  the 
  

   apex, 
  which 
  is 
  broadly 
  and 
  narrowly 
  incised. 
  Punctuation 
  

   of 
  head 
  close 
  and 
  rather 
  strong 
  ; 
  the 
  face 
  densely 
  covered 
  

   with 
  silvery 
  hair. 
  Head 
  below 
  the 
  antennce 
  and 
  the 
  orbits 
  

   for 
  the 
  length 
  of 
  the 
  scape 
  above 
  the 
  base 
  of 
  the 
  antennae, 
  and 
  

   the 
  mandibles, 
  except 
  at 
  the 
  apex, 
  yellow. 
  Extreme 
  apex 
  

   of 
  clypeus 
  black. 
  Thorax 
  strongly 
  punctured, 
  more 
  coarsely 
  

   on 
  the 
  pleurae 
  ; 
  the 
  tegulae, 
  a 
  lineoneithersideof 
  thepronotum, 
  

   and 
  metanotum, 
  yellow. 
  Trigonal 
  area 
  obscurely 
  aciculated, 
  

   the 
  sides 
  punctured 
  irregularly 
  ; 
  the 
  central 
  furrow 
  crenu- 
  

   lated. 
  Petiole 
  longer 
  than 
  broad, 
  distinctly 
  bulging 
  out 
  at 
  

   the 
  sides 
  ; 
  the 
  segments 
  with 
  a 
  moderately 
  strong 
  punctua- 
  

   tion 
  ; 
  a 
  mark 
  broader 
  than 
  long 
  on 
  the 
  base 
  of 
  the 
  second 
  

   segment 
  ; 
  the 
  apex 
  of 
  the 
  third 
  segment 
  (narrowed 
  in 
  the 
  

   centre) 
  and 
  a 
  narrower 
  belt 
  on 
  the 
  fifth,also 
  narrowed 
  in 
  the 
  

   centre, 
  yellow. 
  Pygidial 
  area 
  elongated, 
  narrower 
  at 
  base 
  

   than 
  at 
  apex, 
  the 
  latter 
  bluntly 
  rounded 
  ; 
  the 
  surface 
  irregu- 
  

   larly 
  rugose. 
  Incision 
  in 
  hypopygium 
  broad, 
  a 
  little 
  longer 
  

  

  