﻿British 
  Braconida. 
  57 
  

  

  Antennae 
  longer 
  than 
  the 
  body, 
  38-jointed, 
  black, 
  the 
  scape 
  piceous 
  

   beneath. 
  Mesothoracic 
  sutures 
  inchoate, 
  effaced 
  posteriorly. 
  A 
  

   foveola 
  before 
  the 
  scutellum. 
  Mesopleurse 
  with 
  an 
  impunctate 
  

   furrow. 
  Metathorax 
  finely 
  rugulose. 
  Wings 
  hyaline 
  ; 
  sqtiamula 
  

   testaceous 
  ; 
  nervures 
  fiiscous 
  ; 
  stigma 
  fusco-testaeeous, 
  linear, 
  

   very 
  long, 
  emitting 
  the 
  radius 
  before 
  ^ 
  of 
  its 
  length. 
  Legs 
  rufo- 
  

   testaceous 
  ; 
  coxse 
  black 
  at 
  the 
  base 
  ; 
  hind 
  tarsi, 
  and 
  apex 
  of 
  their 
  

   tibiae, 
  fuscous. 
  Abdomen 
  ovate 
  ; 
  1st 
  segment 
  striated 
  ; 
  2d 
  rufoiis 
  

   at 
  the 
  base, 
  its 
  posterior 
  portion, 
  and 
  all 
  the 
  following 
  seg- 
  

   ments, 
  piceous. 
  Terebra 
  concealed. 
  Male 
  unknown. 
  Length, 
  

   li 
  line. 
  

  

  Taken 
  only 
  once 
  by 
  Haliday 
  in 
  North 
  Ireland; 
  it 
  

   seems 
  not 
  to 
  have 
  occurred 
  since. 
  Forster 
  has 
  made 
  of 
  

   it 
  the 
  genus 
  Rhahdospilus. 
  

  

  vii. 
  DiACHASMA, 
  Forster. 
  

  

  Forst., 
  Verh. 
  pr. 
  Eheinl., 
  1862, 
  p. 
  259. 
  

  

  Characters 
  of 
  Opius, 
  except 
  that 
  the 
  2d 
  cubital 
  areolet, 
  

   measured 
  horizontally, 
  is 
  shorter, 
  the 
  2d 
  abscissa 
  of 
  the 
  

   radius 
  not 
  exceeding 
  in 
  length 
  the 
  1st 
  intercubital 
  

   nervure, 
  and 
  the 
  stigma 
  is 
  short, 
  ovate, 
  or 
  subtriangular. 
  

   The 
  shortness 
  of 
  the 
  stigma 
  alone 
  separates 
  Diacliasma 
  

   from 
  Biosteres. 
  The 
  radius, 
  according 
  to 
  Forster, 
  should 
  

   originate 
  heyond 
  the 
  middle 
  of 
  the 
  stigma 
  ; 
  but 
  the 
  

   rigour 
  of 
  this 
  restriction 
  excludes 
  two 
  species, 
  and 
  would 
  

   lead 
  to 
  the 
  formation 
  of 
  two 
  new 
  genera 
  for 
  their 
  

   reception. 
  To 
  avoid 
  this, 
  I 
  have 
  ventured 
  so 
  far 
  to 
  

   enlarge 
  the 
  limits 
  of 
  Diachasma 
  as 
  to 
  leave 
  the 
  origin 
  of 
  

   the 
  radius 
  undetermined. 
  Of 
  the 
  four 
  species 
  brought 
  

   together 
  under 
  this 
  denomination, 
  two, 
  viz., 
  cajfer 
  and 
  

   rugosa, 
  are 
  not 
  provided 
  for 
  in 
  Forster's 
  synoptical 
  

   table 
  ; 
  it 
  may 
  be 
  presumed 
  that 
  they 
  were 
  unknown 
  to 
  

   him, 
  or 
  he 
  would 
  have 
  been 
  obliged, 
  on 
  his 
  own 
  prin- 
  

   ciples, 
  to 
  make 
  a 
  separate 
  genus 
  for 
  each. 
  

  

  Table 
  of 
  Species. 
  

  

  (2) 
  1. 
  First 
  abdominal 
  segment 
  smooth 
  and 
  shin- 
  

   ing 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  . 
  1. 
  caffer, 
  Wesm. 
  

  

  (1) 
  2. 
  First 
  abdominal 
  segment 
  rugulose. 
  

  

  (6) 
  3. 
  Second 
  and 
  third 
  abdominal 
  segments 
  smooth. 
  

  

  (5) 
  4. 
  Abdomen, 
  after 
  the 
  1st 
  segment, 
  black 
  .. 
  2. 
  cephalotes, 
  Wesm. 
  

  

  