﻿30 
  Rev. 
  T. 
  A. 
  Marshall's 
  Monograph 
  of 
  

  

  14. 
  Op'ius 
  crassipes, 
  Wesm. 
  

  

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

   p. 
  127 
  ; 
  Hal., 
  Ent. 
  Mag., 
  iv., 
  209, 
  2 
  . 
  

  

  Black 
  ; 
  mandibles 
  testaceous 
  in 
  the 
  middle, 
  emarginate 
  beneath 
  

   at 
  the 
  base 
  ; 
  palpi 
  blackish. 
  Face 
  distinctly 
  carinated 
  ; 
  clypeus 
  

   not 
  reaching 
  the 
  mandibles, 
  rounded 
  at 
  the 
  extremity. 
  AntenneB 
  

   entirely 
  black, 
  27-jointed, 
  as 
  long 
  as 
  the 
  body. 
  Mesothoracic 
  

   sutures 
  complete, 
  shallow, 
  ending 
  in 
  a 
  punctiform 
  impression 
  

   before 
  the 
  scntellum. 
  Mesopleurae 
  with 
  an 
  impunctate 
  furrow. 
  

   Metathorax 
  finely 
  rugulose. 
  Wings 
  ample, 
  much 
  longer 
  than 
  the 
  

   body, 
  hyaline, 
  stigma 
  and 
  nervures 
  pale 
  fuscous 
  ; 
  stigma 
  elliptic, 
  

   shorter 
  and 
  thicker 
  than 
  in 
  instabilis, 
  pygniceator, 
  and 
  apiculator 
  

   (spp. 
  16, 
  3, 
  4), 
  emitting 
  the 
  radius 
  just 
  before 
  the 
  middle 
  ; 
  radial 
  

   areolet 
  ending 
  at 
  some 
  distance 
  from 
  the 
  extremity 
  of 
  the 
  wing 
  ; 
  

   radius 
  slightly 
  curved 
  ; 
  recurrent 
  nervure 
  conspicuously 
  evected 
  ; 
  

   1st 
  abscissa 
  of 
  the 
  radius 
  very 
  short, 
  nearly 
  as 
  broad 
  as 
  long. 
  Legs 
  

   unusually 
  stout, 
  testaceous 
  ; 
  coxae, 
  1st 
  joint 
  of 
  trochanters, 
  base 
  of 
  

   femora, 
  as 
  well 
  as 
  their 
  upper 
  and 
  sometimes 
  their 
  lower 
  edges, 
  

   blackish 
  ; 
  tarsi 
  and 
  tips 
  of 
  hind 
  tibias 
  fuscescent. 
  Abdomen 
  short, 
  

   convex 
  ; 
  1st 
  segment 
  finely 
  rugulose. 
  Terebra 
  as 
  long 
  as 
  ^ 
  of 
  the 
  

   abdomen. 
  Male 
  unknown. 
  Length, 
  1 
  ; 
  wings, 
  2f 
  lines. 
  

  

  Taken 
  by 
  Wesmael 
  once 
  only 
  near 
  Brussels 
  : 
  that 
  

   author 
  adds 
  that 
  he 
  possessed 
  a 
  <? 
  corresponding 
  in 
  all 
  

   respects, 
  except 
  that 
  the 
  legs 
  were 
  more 
  slender, 
  whence 
  

   he 
  was 
  led 
  to 
  doubt 
  whether 
  it 
  belonged 
  to 
  the 
  species 
  ; 
  

   analogy, 
  however, 
  tends 
  to 
  show 
  that 
  the 
  slenderness 
  of 
  

   the 
  legs 
  is 
  likely 
  to 
  be 
  merely 
  a 
  sexual 
  distinction. 
  

   Haliday 
  found 
  two 
  females 
  in 
  North 
  Ireland, 
  and 
  I 
  have 
  

   four, 
  captured 
  at 
  Niton, 
  in 
  the 
  I. 
  of 
  Wight, 
  and 
  in 
  the 
  

   London 
  district. 
  This 
  species 
  constitutes 
  Forster's 
  

   genus 
  Hypocy 
  nodus. 
  

  

  15. 
  Opius 
  scevus, 
  Hal. 
  

  

  O. 
  scevus, 
  Hal., 
  Ent. 
  Mag., 
  iv., 
  209, 
  <? 
  ? 
  . 
  

  

  Black 
  ; 
  clypeus 
  and 
  mandibles 
  testaceous, 
  the 
  former 
  not 
  

   touching 
  the 
  latter. 
  Mandibles 
  not 
  emarginate 
  at 
  the 
  base. 
  

   Antennae 
  longer 
  than 
  the 
  body, 
  black 
  with 
  the 
  scape 
  testaceous, 
  

   29-jointed 
  in 
  the 
  ? 
  , 
  33 
  — 
  34-jointed 
  in 
  the 
  $ 
  . 
  Mesoplem-ae 
  with 
  an 
  

   impunctate 
  furrow. 
  A 
  punctiform 
  impression 
  befoi-e 
  the 
  scutellum. 
  

   Metathorax 
  rugulose. 
  Wings 
  hyaline 
  ; 
  squamula 
  testaceous 
  ; 
  

   stigma 
  and 
  nerviures 
  fuscous 
  ; 
  stigma 
  much 
  attenuated, 
  linear- 
  

   lanceolate, 
  emitting 
  the 
  radiui 
  before 
  ^ 
  of 
  its 
  length 
  ; 
  radial 
  areolet 
  

  

  