﻿42 
  Rev. 
  T. 
  A. 
  Marshall's 
  Monograph 
  of 
  

  

  testaceous, 
  not 
  touching 
  the 
  mandibles. 
  Palpi 
  testaceous. 
  Antennae 
  

   longer 
  than 
  the 
  body, 
  black, 
  with 
  the 
  1st 
  joint 
  and 
  the 
  extremity 
  

   of 
  the 
  2d 
  testaceous. 
  Mesothoracic 
  sutures 
  inchoate, 
  effaced 
  pos- 
  

   teriorly. 
  Furrow 
  of 
  the 
  mesopleurse 
  deeply 
  crenulate. 
  A 
  puncti- 
  

   form 
  impression 
  before 
  the 
  scutellura. 
  Metathorax 
  laagulose. 
  

   AVings 
  hj'aline 
  ; 
  nervures 
  and 
  stigma 
  fusco-testaceous 
  ; 
  radial 
  

   areolet 
  almost 
  reaching 
  the 
  extremity 
  of 
  the 
  wing 
  ; 
  stigma 
  

   narrow, 
  elongate, 
  emitting 
  the 
  radius 
  at 
  about 
  ^ 
  of 
  its 
  length 
  ; 
  1st 
  

   abscissa 
  longer 
  than 
  the 
  thickness 
  of 
  the 
  stigma 
  ; 
  3d 
  slightly 
  

   curved 
  ; 
  2d 
  cubital 
  areolet 
  elongate, 
  hardly 
  attenuated 
  outwards 
  ; 
  

   podiscoidal 
  areolet 
  closed 
  ; 
  recurrent 
  nervure 
  evected. 
  Pobrachial 
  

   transverse 
  nervure 
  of 
  the 
  hind 
  wings 
  inchoate. 
  Legs 
  testaceous. 
  

   First 
  abdominal 
  segment 
  black, 
  rugulose. 
  Terebra 
  subexserted. 
  

   Male 
  not 
  described. 
  Length, 
  IJ 
  line. 
  

  

  Wesmael 
  and 
  Haliclay 
  bad 
  each 
  a 
  single 
  specimen. 
  I 
  

   possess 
  a 
  ^ 
  from 
  Walker's 
  collection 
  supposed 
  to 
  be 
  of 
  

   tbis 
  species, 
  but 
  it 
  is 
  in 
  too 
  bad 
  a 
  condition 
  to 
  be 
  de- 
  

   scribed; 
  its 
  antennae 
  are 
  32-jointed. 
  

  

  31. 
  Opiiis 
  riificeps, 
  Wesm. 
  

  

  O. 
  riificeps, 
  Wesm., 
  Nouv. 
  Mem. 
  Ac. 
  Brux., 
  1835, 
  

   p. 
  143, 
  ? 
  , 
  pi. 
  ii., 
  fig. 
  9 
  (wing) 
  ; 
  1838, 
  p. 
  146, 
  $ 
  . 
  

  

  5 
  . 
  Form 
  robust 
  ; 
  black, 
  head 
  rufous, 
  except 
  the 
  stemmaticum. 
  

   Clypeus 
  remote 
  from 
  the 
  mandibles, 
  and 
  like 
  them, 
  rufo-testaceous 
  ; 
  

   palpi 
  dusky 
  ; 
  face 
  strongly 
  carinated. 
  Antennte 
  longer 
  than 
  the 
  

   body, 
  34-jointed, 
  the 
  joints 
  short; 
  black, 
  1st 
  joint 
  testaceous. 
  

   Mesothoracic 
  sutures 
  deeply 
  impressed. 
  Furrow 
  of 
  the 
  meso- 
  

   pleurse 
  strongly 
  crenated. 
  Metathorax 
  rugose. 
  Wings 
  infumated 
  

   as 
  far 
  as 
  the 
  stigma, 
  thence 
  to 
  the 
  extremity 
  hyaline 
  ; 
  stigma 
  and 
  

   nervures 
  blackish 
  ; 
  radial 
  areolet 
  reaching 
  the 
  extremity 
  of 
  the 
  

   wing 
  ; 
  2d 
  cubital 
  areolet 
  moderately 
  attenuated 
  outwards 
  ; 
  stigma 
  

   broad, 
  oval, 
  emitting 
  the 
  radius 
  somewhat 
  beyond 
  the 
  middle 
  ; 
  2d 
  

   abscissa 
  a 
  little 
  longer 
  than 
  the 
  1st 
  intercubital 
  nervure 
  ; 
  podiscoidal 
  

   areolet 
  completely 
  closed 
  ; 
  recurrent 
  nervure 
  evected. 
  Hind 
  wings 
  

   with 
  a 
  radms 
  faintly 
  traced 
  but 
  discernible 
  ; 
  no 
  pobrachial 
  trans- 
  

   verse 
  nervure. 
  Legs 
  rufo-testaceous 
  ; 
  all 
  the 
  tarsi, 
  and 
  base 
  of 
  the 
  

   hind 
  coxae, 
  black. 
  Abdomen 
  short, 
  broad, 
  subcircular 
  ; 
  1st 
  seg- 
  

   ment 
  mostly 
  rugose, 
  with 
  an 
  unequal 
  surface, 
  somewhat 
  shining, 
  

   bicarinate 
  at 
  the 
  base, 
  the 
  carinae 
  converging 
  posteriorly. 
  Terebra 
  

   not 
  surpassing 
  the 
  anus. 
  ^ 
  . 
  Similar 
  ; 
  abdomen 
  narrower, 
  less 
  

   rounded 
  at 
  the 
  sides. 
  Length, 
  1^ 
  line. 
  

  

  Wesmael 
  discovered 
  both 
  sexes 
  in 
  Belgium; 
  and 
  I 
  

  

  