﻿5Q 
  Eev. 
  T. 
  A. 
  Marshall's 
  Monograph 
  of 
  

  

  Black 
  ; 
  face 
  strongly 
  carinated, 
  punctate 
  ; 
  clypeiis 
  reaching 
  the 
  

   mandibles, 
  testaceous, 
  sometimes 
  black 
  at 
  the 
  base, 
  punctate; 
  

   mandibles 
  rufous 
  ; 
  palpi 
  testaceous. 
  ^ 
  ? 
  . 
  Antennae 
  longer 
  than 
  

   the 
  body, 
  37 
  — 
  39-jointed, 
  black, 
  the 
  scape 
  rufous. 
  Mesothoracic 
  

   sutures 
  inchoate, 
  effaced 
  posteriorly. 
  An 
  oblong 
  fovea 
  before 
  the 
  

   scutellum, 
  which 
  is 
  rugulose, 
  like 
  the 
  metathorax. 
  Wings 
  hyaline 
  ; 
  

   squamula 
  testaceous 
  ; 
  nervures 
  fuscous 
  ; 
  stigma 
  fusco-testaceous, 
  

   darker 
  in 
  the 
  J^ 
  , 
  emitting 
  the 
  radius 
  from 
  the 
  middle 
  ; 
  1st 
  abscissa 
  

   not 
  half 
  as 
  long 
  as 
  the 
  2d, 
  and 
  not 
  longer 
  than 
  the 
  width 
  of 
  the 
  

   stigma 
  ; 
  2d 
  abscissa 
  and 
  1st 
  intercubital 
  nervure 
  about 
  equal 
  in 
  

   length 
  ; 
  3d 
  abscissa 
  straight, 
  ending 
  rather 
  before 
  the 
  extremity 
  

   of 
  the 
  wing 
  ; 
  recm^rent 
  nervure 
  slightly 
  evected. 
  No 
  trace 
  of 
  a 
  

   pobrachial 
  transverse 
  nervure 
  in 
  the 
  hind 
  wings. 
  Legs 
  rufo- 
  

   testaceous 
  ; 
  coxae 
  sometimes 
  infnscated 
  at 
  the 
  base 
  above 
  ; 
  tips 
  of 
  

   tarsi 
  dusky. 
  First 
  abdominal 
  segment 
  longitudinally 
  rugose, 
  

   sometimes 
  faintly 
  carinated 
  m 
  the 
  middle. 
  Terebra 
  concealed. 
  

   Length, 
  Ih 
  ; 
  wings, 
  3| 
  lines. 
  

  

  According 
  to 
  Haliday, 
  not 
  uncommon 
  in 
  North 
  Ireland 
  

   during 
  May 
  and 
  June 
  ; 
  also 
  found 
  in 
  England 
  by 
  Walker, 
  

   and 
  twice 
  by 
  me 
  in 
  Leicestershire. 
  It 
  closely 
  resembles 
  

   the 
  following 
  species, 
  but 
  the 
  difference 
  of 
  the 
  wings 
  

   renders 
  their 
  separation 
  necessary. 
  

  

  9. 
  Biosteres 
  sylvaticus, 
  Hal. 
  

  

  Opius 
  sylvaticus, 
  Hal., 
  Ent. 
  Mag., 
  iv., 
  219, 
  <? 
  ? 
  . 
  

  

  More 
  slender 
  than 
  the 
  preceding, 
  but 
  otherwise 
  indistinguishable, 
  

   except 
  by 
  the 
  wings. 
  Stigma 
  fusco-testaceous, 
  emitting 
  the 
  radius 
  

   before 
  the 
  middle; 
  3d 
  abscissa 
  curved, 
  concave 
  beneath, 
  ap- 
  

   proaching 
  nearer 
  to 
  the 
  extremity 
  of 
  the 
  wing 
  than 
  in 
  Wes))iaclii 
  ; 
  

   hence 
  the 
  radial 
  areolet 
  is 
  more 
  cultrate 
  and 
  longer 
  in 
  proportion 
  ; 
  

   2d 
  cubital 
  areolet 
  horizontally 
  longer 
  and 
  vertically 
  narrower. 
  In 
  

   the 
  (^ 
  , 
  as 
  in 
  the 
  cognate 
  species, 
  the 
  principal 
  nervures 
  are 
  in- 
  

   crassated 
  and 
  darker. 
  Length, 
  li 
  ; 
  wings, 
  3i 
  lines. 
  

  

  According 
  to 
  Haliday, 
  much 
  rarer 
  in 
  North 
  Ireland 
  

   than 
  the 
  last 
  species 
  ; 
  Walker 
  detected 
  the 
  3' 
  in 
  England, 
  

   and 
  I 
  possess 
  both 
  sexes 
  captured 
  near 
  Abergaveun}-, 
  

   and 
  Nunton, 
  in 
  Wilts. 
  

  

  10. 
  Biosteres 
  placidus, 
  Hal. 
  

   Opms 
  placidus, 
  Hal., 
  Ent. 
  Mag., 
  iv., 
  217, 
  2 
  . 
  

  

  Black 
  ; 
  base 
  of 
  2d 
  abdominal 
  segment 
  rufous. 
  Face 
  carinated 
  ; 
  

   oral 
  parts 
  rufo-testaceous 
  ; 
  clypeus 
  not 
  touching 
  the 
  mandibles. 
  

  

  