﻿Manchester 
  Memoirs, 
  Vol. 
  xliii. 
  (1899), 
  No. 
  3. 
  209 
  

  

  by 
  the 
  recurrent 
  and 
  the 
  first 
  transverse 
  cubital 
  nervures 
  ; 
  

   the 
  cubital 
  nervure 
  in 
  front 
  of 
  the 
  areolet, 
  the 
  second 
  

   transverse 
  cubital 
  and 
  the 
  recurrent 
  nervures 
  are 
  largely 
  

   bullated. 
  Petiole 
  shining, 
  closely 
  strongly 
  and 
  regularly 
  

   striolated, 
  and 
  with 
  a 
  stronger 
  striolation 
  down 
  the 
  sides 
  

   at 
  the 
  base, 
  and 
  extending 
  to 
  near 
  the 
  middle 
  of 
  the 
  apical 
  

   part 
  ; 
  the 
  second 
  and 
  third 
  segments 
  form 
  one 
  piece, 
  the 
  

   line 
  of 
  demarcation 
  being 
  only 
  faintly 
  indicated 
  at 
  the 
  

   sides, 
  and 
  are 
  uniformly 
  and 
  closely 
  longitudinally 
  reticu- 
  

   lated 
  and 
  striated 
  ; 
  the 
  apex 
  of 
  the 
  third 
  rounded 
  at 
  the 
  

   sides, 
  which 
  have 
  no 
  teeth, 
  the 
  centre 
  looked 
  at 
  from 
  

   above 
  is 
  transverse. 
  

  

  This 
  species 
  is 
  very 
  different 
  from 
  R. 
  tvroaghtoni, 
  

   differing 
  markedly 
  in 
  some 
  structural 
  points 
  ; 
  e.g., 
  the 
  

   latter 
  has 
  on 
  each 
  side 
  of 
  the 
  scutellum 
  a 
  stout 
  triangular 
  

   tooth 
  ; 
  the 
  second 
  and 
  third 
  abdominal 
  segments 
  are 
  

   distinctly 
  separated 
  ; 
  the 
  third 
  ends 
  in 
  a 
  stout 
  tooth 
  at 
  

   the 
  sides. 
  \n 
  R. 
  annulicornis 
  the 
  third 
  segment 
  has 
  a 
  

   distinct 
  well 
  defined 
  depression 
  along 
  the 
  sides 
  and 
  apex. 
  

  

  RotJineyia 
  and 
  the 
  new 
  genus, 
  Chreusa, 
  here 
  described, 
  

   will 
  form 
  a 
  new 
  division 
  of 
  the 
  IcJineumones, 
  R0tJ1neyiv.ce, 
  

   distinguished 
  by 
  having 
  only 
  the 
  basal 
  three 
  segments 
  of 
  

   the 
  abdomen 
  very 
  large, 
  the 
  others 
  being 
  very 
  much 
  

   abbreviated, 
  by 
  the 
  wings 
  having 
  no 
  areolet, 
  by 
  the 
  

   parapsidal 
  furrows 
  being 
  obsolete, 
  and 
  by 
  the 
  petiolar 
  

   spiracles 
  being 
  placed 
  between 
  the 
  middle 
  and 
  the 
  apex. 
  

  

  Chreusa, 
  gen. 
  nov. 
  

  

  Belongs 
  to 
  the 
  section 
  of 
  the 
  Ichneumonides 
  with 
  the 
  

   metathoracic 
  spiracles 
  linear, 
  and 
  with 
  the 
  spiracles 
  on 
  the 
  

   petiole 
  placed 
  between 
  the 
  middle 
  and 
  the 
  apex 
  ; 
  but 
  

   differs 
  from 
  them 
  all 
  in 
  the 
  three 
  basal 
  segments 
  of 
  the 
  

   abdomen 
  being 
  large 
  and 
  of 
  equal 
  length 
  ; 
  the 
  third 
  with 
  

   the 
  apex 
  raised 
  ; 
  the 
  other 
  segments 
  minute, 
  hidden 
  under 
  

  

  