﻿Hymenoptera 
  Orientalis. 
  15 
  

  

  CerCERIS 
  INSTABILIS, 
  Smith, 
  (PI. 
  X. 
  f. 
  4 
  — 
  4 
  a, 
  b). 
  

  

  A 
  common 
  and 
  variable 
  species, 
  especially 
  as 
  regards 
  

   the 
  amount 
  of 
  black 
  on 
  the 
  thorax 
  and 
  abdomen. 
  The 
  $ 
  

   is 
  C. 
  velox, 
  Smith. 
  

  

  L- 
  6ERCERIS 
  PULCHRA. 
  (PI. 
  X. 
  f. 
  5, 
  a, 
  b.) 
  

  

  Black, 
  the 
  scape 
  beneath, 
  the 
  cheeks, 
  clypeus, 
  mandibles 
  

   except 
  at 
  apex, 
  two 
  lines 
  on 
  the 
  pronotum, 
  tegulae, 
  meta- 
  

   notum, 
  a 
  mark 
  on 
  the 
  base 
  of 
  the 
  second 
  abdominal 
  segment, 
  

   the 
  third 
  segment 
  except 
  the 
  base 
  in 
  the 
  centre 
  ; 
  the 
  fifth 
  

   segment, 
  the 
  second 
  ventral 
  segment 
  laterally, 
  and 
  the 
  

   legs, 
  yellow 
  ; 
  the 
  petiole 
  and 
  second 
  abdominal 
  segment 
  

   ferruginous, 
  except 
  the 
  yellow 
  and 
  a 
  black 
  mark 
  on 
  the 
  

   latter. 
  Clypeus 
  a 
  little 
  gaping 
  at 
  the 
  apex, 
  which 
  is 
  black 
  

   and 
  incised. 
  Eyes 
  parallel. 
  Hinder 
  ocelli 
  separated 
  from 
  the 
  

   eyes 
  by 
  near 
  the 
  same 
  distance 
  they 
  are 
  from 
  each 
  other. 
  

   Body 
  covered 
  with 
  longish 
  pale 
  fulvous 
  pubescence, 
  almost 
  

   golden 
  on 
  the 
  face; 
  the 
  punctuation 
  is 
  strong 
  and 
  coarse 
  ; 
  the 
  

   scutellum 
  strongly 
  punctured. 
  Trigonal 
  region 
  rugose, 
  and 
  

   with 
  some 
  stout 
  keels 
  ; 
  the 
  central 
  furrow 
  deep. 
  Petiole 
  

   distinctly 
  longer 
  than 
  broad 
  ; 
  pygidial 
  area 
  elongate, 
  gradu- 
  

   ally 
  narrowed 
  towards 
  the 
  apex, 
  which 
  is 
  almost 
  transverse, 
  

   but 
  with 
  the 
  edges 
  rounded 
  ; 
  the 
  incision 
  in 
  the 
  hypopygium 
  

   is 
  a 
  little 
  longer 
  than 
  wide, 
  rounded 
  at 
  the 
  base, 
  and 
  becom- 
  

   ing 
  wider 
  towards 
  the 
  apex 
  ; 
  the 
  top 
  of 
  the 
  pygidial 
  area 
  is 
  

   irregularly 
  punctured, 
  without 
  a 
  hair 
  fringe, 
  and 
  covered 
  

   with 
  long 
  pale 
  pubescence. 
  The 
  coxae 
  are 
  black 
  at 
  the 
  

   base 
  ; 
  the 
  hinder 
  femora 
  are 
  for 
  the 
  greater 
  part 
  black 
  ; 
  the 
  

   hind 
  tibice 
  are 
  fuscous 
  on 
  the 
  outer 
  side 
  at 
  the 
  apex. 
  Antennae 
  

   rufous 
  ; 
  the 
  third 
  joint 
  curved, 
  twice 
  the 
  length 
  of 
  the 
  second 
  

   and 
  longer 
  than 
  the 
  fourth. 
  The 
  wings 
  are 
  suffused 
  with 
  

   fuscous 
  ; 
  the 
  apex 
  broadly 
  smoky 
  ; 
  the 
  second 
  cubital 
  cellule 
  

   has 
  the 
  peduncle 
  not 
  much 
  shorter 
  than 
  the 
  cellule 
  ; 
  the 
  

   first 
  recurrent 
  nervure 
  is 
  received 
  in 
  the 
  basal 
  fourth 
  ; 
  the 
  

  

  