﻿22 
  CAMERON, 
  Hymenoptera 
  Orientalia. 
  

  

  The 
  head 
  is 
  larger 
  than 
  usual, 
  and 
  much 
  more 
  sharply 
  

   and 
  distinctly 
  margined 
  behind 
  ; 
  the 
  vertex 
  is 
  distinctly 
  

   furrowed, 
  and 
  the 
  frontal 
  area 
  is 
  distinctly 
  defined. 
  

  

  - 
  Tenthredo 
  MEGACEPHALA, 
  Sp. 
  nov. 
  

  

  Flavo-testacea; 
  fiagello 
  antennarum, 
  femoribas, 
  tibiis, 
  

   tarsi's 
  posticis 
  abdominisque 
  apice 
  nigris 
  ; 
  alls 
  flavis^ 
  apicc 
  

   fumatis. 
  $ 
  . 
  

  

  Long. 
  17 
  mm. 
  

  

  The 
  scape 
  of 
  the 
  antennse 
  covered 
  with 
  a 
  longish, 
  the 
  

   flagellum 
  densely 
  with 
  a 
  short, 
  black 
  pubescence. 
  Head 
  

   large 
  ; 
  the 
  occiput 
  sharply 
  margined 
  ; 
  the 
  vertex 
  raised 
  

   in 
  the 
  middle, 
  the 
  furrows 
  wide 
  and 
  deep, 
  extending 
  

   below 
  the 
  ocelli 
  ; 
  the 
  raised 
  part 
  of 
  the 
  vertex 
  indistinctly 
  

   keeled 
  down 
  the 
  middle. 
  The 
  front 
  is 
  raised 
  in 
  the 
  

   middle 
  below 
  the 
  ocelli 
  ; 
  the 
  apex 
  of 
  the 
  raised 
  part 
  

   depressed, 
  narrowed 
  gradually 
  towards 
  the 
  apex, 
  and 
  with 
  

   a 
  keel 
  in 
  the 
  middle 
  ; 
  the 
  keel 
  broad 
  at 
  the 
  base, 
  gradually 
  

   narrowed 
  towards 
  the 
  apex. 
  Clypeus 
  and 
  labrum 
  smooth, 
  

   pallid 
  yellow 
  ; 
  the 
  apex 
  of 
  the 
  clypeus 
  roundly 
  incised 
  ; 
  

   the 
  apical 
  half 
  of 
  the 
  labrum 
  and 
  the 
  basal 
  half 
  of 
  the 
  

   mandibles 
  covered 
  with 
  long, 
  fulvous 
  hair 
  ; 
  the 
  apex 
  

   black. 
  Mesonotum 
  of 
  a 
  darker 
  colour 
  than 
  the 
  rest 
  of 
  

   the 
  thorax; 
  closely 
  and 
  rather 
  strongly 
  punctured, 
  thickly 
  

   covered 
  with 
  short, 
  black 
  hair 
  ; 
  the 
  middle 
  lobe 
  raised 
  

   and 
  furrowed 
  in 
  the 
  middle. 
  Scutellum 
  large, 
  pyramidal, 
  

   the 
  top 
  with 
  a 
  longitudinal 
  keel, 
  and 
  bearing 
  long, 
  black 
  

   hair. 
  The 
  cloud 
  in 
  the 
  fore 
  wings 
  extends 
  from 
  the 
  end 
  

   of 
  the 
  transverse 
  radial, 
  the 
  second 
  transverse 
  cubital, 
  and 
  

   the 
  second 
  recurrent 
  nervures 
  ; 
  there 
  is 
  a 
  distinct 
  smoky 
  

   cloud 
  in 
  the 
  apex 
  of 
  the 
  hinder 
  wings. 
  The 
  four 
  anterior 
  

   legs 
  are 
  yellow, 
  paler 
  at 
  the 
  base 
  ; 
  the 
  apices 
  of 
  the 
  tarsi 
  

   infuscated 
  ; 
  the 
  hinder 
  legs 
  black, 
  except 
  the 
  coxa; 
  and 
  

   trochanters 
  ; 
  all 
  the 
  tibia; 
  and 
  tarsi 
  are 
  thickly 
  covered 
  

  

  