﻿28 
  Mr. 
  Cameron 
  o7i 
  

  

  the 
  pronotum, 
  scutellum, 
  post 
  scutellum, 
  a 
  narrow 
  band 
  on 
  

   the 
  base 
  of 
  the 
  second 
  abdominal 
  segment, 
  the 
  extreme 
  

   apex 
  of 
  the 
  petiole, 
  the 
  apical 
  half 
  of 
  the 
  third 
  segment 
  and 
  

   the 
  extreme 
  apex 
  of 
  the 
  fourth, 
  reddish-fulvous. 
  Legs 
  

   black 
  ; 
  the 
  anterior 
  tibiae 
  and 
  tarsi 
  obscure 
  testaceous 
  in 
  

   front. 
  Length 
  15 
  mm. 
  

  

  Cerceris 
  HUMBERTIANA 
  (PI. 
  X., 
  f. 
  16, 
  a, 
  b.) 
  

   In 
  the 
  $ 
  the 
  eyes 
  are 
  parallel. 
  The 
  hinder 
  ocelli 
  

   are 
  separated 
  from 
  them 
  by 
  a 
  little 
  more 
  than 
  the 
  

   length 
  of 
  the 
  third 
  antennal 
  joint, 
  and 
  by 
  nearly 
  the 
  same 
  

   distance 
  from 
  each 
  other. 
  The 
  middle 
  of 
  the 
  clypeus 
  

   projects 
  considerably, 
  the 
  projection 
  almost 
  truncated 
  at 
  

   the 
  apex, 
  except 
  that 
  there 
  is 
  a 
  waved 
  projection 
  in 
  the 
  

   middle 
  ; 
  the 
  sides 
  of 
  the 
  projection 
  are 
  obliquely 
  curved. 
  

   The 
  lateral 
  hair 
  fringe 
  is 
  dense 
  and 
  golden. 
  The 
  third 
  

   antennal 
  joint 
  is 
  a 
  little 
  longer 
  than 
  the 
  fourth 
  and 
  attenu- 
  

   ated 
  at 
  the 
  apex. 
  The 
  puncturing 
  on 
  the 
  top 
  of 
  the 
  head 
  

   is 
  very 
  deep 
  and 
  coarse, 
  on 
  the 
  thorax 
  it 
  is 
  not 
  quite 
  so 
  

   strong. 
  The 
  trigonal 
  area 
  of 
  median 
  segment 
  is 
  smooth, 
  

   shining, 
  and 
  impunctuate, 
  and 
  has 
  very 
  narrow 
  and 
  in- 
  

   distinct 
  furrow 
  down 
  the 
  middle. 
  Pygidial 
  area 
  bearing 
  

   large 
  oval 
  punctures; 
  it 
  is 
  a 
  little 
  narrowed 
  and 
  truncated 
  at 
  

   the 
  apex 
  and 
  has 
  there 
  a 
  golden 
  pile. 
  The 
  petiole 
  is 
  broader 
  

   than 
  long 
  and 
  rugosely 
  punctured. 
  The 
  other 
  segments 
  

   bear 
  large, 
  separated 
  punctures 
  of 
  moderate 
  length. 
  

  

  May 
  be 
  known 
  from 
  the 
  S 
  of 
  vistabilis 
  by 
  the 
  clypeus 
  

   of 
  the 
  latter 
  not 
  projecting 
  so 
  squarely 
  in 
  the 
  middle 
  ; 
  by 
  

   the 
  trigonal 
  area 
  being 
  coarsely 
  longitudinally 
  striolated 
  ; 
  

   by 
  the 
  petiole 
  being 
  much 
  narrower, 
  being 
  clearly 
  longer 
  

   than 
  broad 
  ; 
  by 
  the 
  yellow 
  band 
  on 
  the 
  vertex, 
  &c. 
  

   Apparently 
  a 
  common 
  species. 
  

  

  Cerceris 
  EMORTUALIS. 
  

   I 
  should 
  say, 
  judging 
  how 
  very 
  variable 
  Jiunibertiana 
  is, 
  

   that 
  this 
  will 
  prove 
  to 
  be 
  a 
  variety 
  of 
  the 
  latter. 
  

  

  