﻿14 
  Mr. 
  Cameron 
  on 
  

  

  segment, 
  the 
  basal 
  two 
  ventral 
  segments 
  and 
  the 
  penulti- 
  

   mate 
  on 
  either 
  side 
  and 
  the 
  legs, 
  yellow 
  ; 
  the 
  femora 
  lined 
  

   with 
  fuscous 
  above. 
  Wings 
  clear 
  hyaline, 
  the 
  apex 
  infus- 
  

   cated, 
  the 
  stigma 
  and 
  nervures 
  fuscous. 
  Body 
  covered 
  

   closely 
  with 
  whitish 
  pubescence, 
  which 
  is 
  especially 
  thick 
  

   on 
  the 
  head. 
  The 
  punctuation 
  of 
  moderate 
  intensity 
  ; 
  the 
  

   trigonal 
  area 
  of 
  median 
  segment 
  smooth, 
  impunctate, 
  

   and 
  there 
  is 
  an 
  impunctate 
  space 
  on 
  the 
  sides 
  of 
  the 
  median 
  

   segment 
  and 
  on 
  the 
  metapleura. 
  Clypeus 
  moderately 
  

   convex, 
  the 
  apex 
  transverse, 
  with 
  a 
  short 
  blunt 
  tooth 
  at 
  

   either 
  end. 
  Hinder 
  ocelli 
  separated 
  from 
  the 
  eyes 
  by 
  

   the 
  length 
  of 
  the 
  third 
  antennal 
  joint, 
  and 
  by 
  a 
  slightly 
  less 
  

   distance 
  from 
  each 
  other. 
  Eyes 
  a 
  little 
  diverging 
  beneath, 
  

   the 
  orbits 
  behind 
  clearly 
  margined. 
  The 
  scutellum 
  is 
  

   smooth, 
  with 
  a 
  border 
  of 
  widely 
  set 
  apart 
  punctures 
  ; 
  the 
  

   metanotum 
  is 
  impunctate. 
  The 
  furrow 
  down 
  the 
  centre 
  of 
  

   the 
  trigonal 
  area 
  is 
  shallow 
  ; 
  the 
  margin 
  of 
  the 
  area 
  is 
  

   crenulated. 
  Petiole 
  a 
  little 
  longer 
  than 
  wide. 
  Pygidial 
  

   area 
  elongate, 
  narrow, 
  rounded 
  at 
  the 
  apex 
  ; 
  the 
  base 
  

   narrower 
  than 
  the 
  apex 
  ; 
  the 
  top 
  closely 
  and 
  finely 
  

   transversely 
  rugose 
  ; 
  the 
  hair 
  fringe 
  white 
  ; 
  hypopy- 
  

   gium 
  not 
  incised. 
  Antennae 
  blackish 
  above 
  ; 
  the 
  flagellum 
  

   obscure 
  rufous 
  beneath. 
  Second 
  cubital 
  cellule 
  with 
  

   the 
  peduncle 
  not 
  much 
  shorter 
  than 
  the 
  width 
  of 
  the 
  

   cellule 
  itself; 
  the 
  first 
  recurrent 
  nervure 
  is 
  received 
  in 
  the 
  

   basal 
  third 
  ; 
  the 
  second 
  a 
  little 
  beyond 
  the 
  apex 
  of 
  the 
  

   cellule, 
  and 
  almost 
  interstitial. 
  Length 
  lo 
  mm. 
  

  

  This 
  species 
  comes 
  nearest 
  to 
  C. 
  instabilis 
  ; 
  but 
  may 
  

   easily 
  be 
  known 
  from 
  it 
  by 
  the 
  clypeus 
  not 
  being 
  incised 
  ; 
  

   by 
  the 
  punctuation 
  being 
  not 
  so 
  strong, 
  especially 
  on 
  the 
  

   scutellum 
  and 
  median 
  segment 
  ; 
  by 
  the 
  smooth, 
  not 
  rugosely 
  

   punctured, 
  trigonal 
  area, 
  by 
  the 
  narrower, 
  longer, 
  straighter, 
  

   pygidial 
  area, 
  which 
  in 
  instabilis 
  is 
  wider 
  at 
  the 
  base 
  than 
  

   at 
  the 
  apex, 
  it 
  bearing 
  also 
  large 
  punctures, 
  and 
  by 
  the 
  

   shorter 
  second 
  cubital 
  cellule. 
  

  

  