﻿28 
  CAMERON, 
  Hymenoptera 
  Orient 
  alia. 
  

  

  longer 
  than 
  the 
  head 
  and 
  thorax 
  united 
  ; 
  the 
  third 
  joint 
  

   is 
  slightly, 
  but 
  distinctly, 
  longer 
  than 
  the 
  fourth. 
  Head 
  

   nearly 
  as 
  wide 
  as 
  the 
  mesothorax, 
  shining, 
  impunctate, 
  

   the 
  front 
  and 
  vertex 
  thickly 
  covered 
  with 
  fuscous 
  

   pubescence 
  ; 
  the 
  lower 
  part 
  of 
  the 
  front, 
  the 
  clypeus 
  and 
  

   the 
  labrum 
  thickly 
  covered 
  with 
  long, 
  white 
  hair. 
  The 
  

   middle 
  of 
  the 
  vertex 
  and 
  the 
  ocellar 
  region 
  bounded 
  by 
  a 
  

   deep 
  furrow 
  ; 
  that 
  on 
  the 
  former 
  deeper 
  behind 
  ; 
  the 
  front 
  

   is 
  deeply 
  depressed 
  above 
  the 
  antennae. 
  Apex 
  of 
  clypeus 
  

   roundly, 
  but 
  not 
  deeply, 
  incised 
  ; 
  the 
  labrum 
  slightly 
  

   depressed, 
  its 
  apex 
  rounded 
  ; 
  the 
  apical 
  joints 
  of 
  the 
  

   palpi 
  are 
  fuscous, 
  paler 
  at 
  the 
  base. 
  Thorax 
  smooth, 
  

   shining, 
  impunctate, 
  thickly 
  covered 
  with 
  fuscous 
  hair 
  ; 
  

   the 
  prothorax, 
  mesonotum 
  with 
  scutellum 
  and 
  the 
  greater 
  

   part 
  of 
  the 
  mesopleurae 
  above, 
  sanguineous 
  ; 
  the 
  furrows 
  

   on 
  the 
  mesonotum 
  deep, 
  that 
  on 
  the 
  middle 
  lobe 
  wider 
  

   and 
  shallower 
  ; 
  the 
  middle 
  lobe 
  ends 
  at 
  the 
  apex 
  in 
  a 
  

   keel. 
  Cenchri 
  large, 
  cream-coloured 
  ; 
  the 
  space 
  between 
  

   them 
  rufous. 
  All 
  the 
  trochanters, 
  the 
  apices 
  of 
  the 
  coxae, 
  

   the 
  base 
  of 
  the 
  hinder 
  femora, 
  the 
  four 
  anterior 
  tibiae, 
  the 
  

   basal 
  two-thirds 
  of 
  the 
  basal 
  pair 
  and 
  the 
  base 
  of 
  the 
  

   anterior 
  tarsi 
  white 
  ; 
  the 
  claws 
  unequally 
  bifid. 
  The 
  second 
  

   and 
  third 
  cubital 
  cellules 
  are 
  equal 
  in 
  length 
  above 
  ; 
  below 
  

   the 
  third 
  is 
  the 
  longer 
  ; 
  both 
  the 
  recurrent 
  nervures 
  are 
  

   received 
  in 
  the 
  basal 
  third 
  of 
  the 
  cellules. 
  Abdomen 
  

   blue-black, 
  shining 
  ; 
  the 
  third 
  segment 
  and 
  the 
  base 
  of 
  

   the 
  fourth 
  dirty 
  white. 
  

  

  Siobla 
  is 
  intermediate 
  between 
  the 
  Tenthredinides 
  and 
  

   the 
  Selandriades. 
  The 
  transverse 
  basal 
  nervure 
  is 
  united 
  

   to 
  the 
  base 
  of 
  the 
  cubital 
  as 
  in 
  the 
  TentJircdinides, 
  but 
  it 
  

   has 
  more 
  the 
  form 
  of 
  the 
  Selandriades. 
  The 
  antennas 
  are 
  

   short 
  and 
  thick 
  ; 
  the 
  eyes 
  are 
  large, 
  and 
  reach 
  near 
  to 
  the 
  

   base 
  of 
  the 
  mandibles; 
  the 
  spurs 
  are 
  short, 
  not 
  one-fourth 
  

   of 
  the 
  length 
  of 
  the 
  metatarsus 
  ; 
  the 
  claws 
  are 
  bifid 
  ; 
  the 
  

  

  