﻿54 
  CAMERON, 
  Hymenoptera 
  Orientalia. 
  

  

  base; 
  so 
  that 
  the 
  absence 
  of 
  the 
  enclosed 
  space 
  on 
  the 
  

   median 
  segment, 
  and, 
  more 
  particularly, 
  the 
  presence 
  of 
  

   the 
  longitudinal 
  furrows 
  on 
  the 
  mesonotum, 
  which 
  are 
  not 
  

   found, 
  so 
  far 
  as 
  I 
  know, 
  in 
  Halictus, 
  are 
  the 
  only 
  points 
  

   of 
  distinction 
  between 
  them 
  so 
  far 
  as 
  regards 
  the 
  females. 
  

   On 
  the 
  other 
  hand 
  the 
  form 
  of 
  the 
  head 
  in 
  the 
  $ 
  is 
  so 
  very 
  

   different 
  from 
  what 
  it 
  is 
  in 
  Halictus, 
  or 
  indeed 
  in 
  any 
  

   allied 
  genus, 
  that 
  it 
  cannot 
  be 
  included 
  in 
  it. 
  

  

  SUDILA 
  BIDENTATA, 
  Sp. 
  110V. 
  (PL 
  4, 
  f. 
  5, 
  $a.) 
  

  

  Nigra, 
  nitida, 
  sparse 
  pailide 
  Jiirta; 
  a 
  lis 
  hyalinis. 
  

  

  Long, 
  fere 
  io 
  mm. 
  

  

  Hab. 
  Ceylon 
  {Rothney). 
  

  

  $. 
  Head 
  shining, 
  impunctate, 
  sparsely 
  covered 
  with 
  

   long, 
  fuscous-black 
  hair; 
  a 
  narrow, 
  but 
  distinct, 
  furrow 
  

   runs 
  from 
  the 
  ocelli, 
  which 
  are 
  bordered 
  behind 
  by 
  a 
  wider 
  

   and 
  deeper 
  furrow. 
  Mandibles 
  piceous-red, 
  except 
  at 
  the 
  

   base 
  and 
  apex. 
  Scape 
  of 
  antennae 
  sparsely 
  covered 
  

   with 
  long 
  black 
  hairs 
  ; 
  the 
  base 
  of 
  the 
  flagellum 
  with 
  

   short, 
  stiff 
  hairs 
  ; 
  the 
  rest 
  of 
  it 
  bearing 
  a 
  pale 
  down. 
  

   Prothorax 
  almost 
  glabrous; 
  its 
  basal 
  edge 
  piceous; 
  the 
  

   mesonotum 
  and 
  scutella 
  sparsely 
  covered 
  with 
  long, 
  

   black 
  hairs. 
  Median 
  segment 
  with 
  a 
  gradually 
  rounded 
  

   slope 
  ; 
  its 
  apex 
  covered 
  with 
  long, 
  white 
  hairs. 
  Mesopleurae 
  

   and 
  mesosternum 
  shining, 
  impunctate, 
  sparsely 
  covered 
  

   with 
  long, 
  white 
  hairs. 
  On 
  the 
  mesopleurae, 
  near 
  the 
  top, 
  

   is 
  a 
  wide, 
  oblique, 
  deep 
  furrow, 
  which 
  reaches 
  near 
  to 
  the 
  

   apex. 
  Wings 
  hyaline, 
  the 
  nervures 
  and 
  stigma 
  black 
  ; 
  the 
  

   first 
  transverse 
  cubital 
  nervure 
  is 
  oblique, 
  straight 
  ; 
  the 
  

   second 
  slightly, 
  the 
  thirdly 
  distinctly, 
  curved. 
  The 
  hair 
  

   on 
  the 
  legs 
  thick, 
  longish, 
  white 
  on 
  the 
  femora, 
  much 
  

   thicker 
  and 
  darker 
  coloured 
  on 
  the 
  tibia; 
  and 
  tarsi 
  ; 
  the 
  

   spurs 
  and 
  claws 
  reddish. 
  Abdomen 
  very 
  smooth 
  and 
  

   shining, 
  the 
  base 
  glabrous, 
  the 
  apex 
  thickly 
  covered 
  with 
  

   long, 
  stiff, 
  fuscous-black 
  hairs 
  ; 
  the 
  apical 
  ventral 
  segments 
  

   thickly 
  covered 
  with 
  long, 
  fuscous 
  hairs. 
  

  

  