﻿52 
  Kev. 
  T. 
  A. 
  Marshall's 
  Monograph 
  of 
  

  

  2. 
  Biosteres 
  impressus, 
  Wesm. 
  

  

  Opius 
  impressus, 
  Wesm., 
  Nouv. 
  Mem. 
  Ac. 
  Brux., 
  1835, 
  

   p. 
  157, 
  <? 
  ; 
  Hal., 
  Ent. 
  Mag., 
  iv., 
  218, 
  3 
  ? 
  . 
  

  

  Bather 
  smaller 
  than 
  the 
  preceding, 
  but 
  with 
  absolutely 
  the 
  same 
  

   characters, 
  except 
  as 
  regards 
  the 
  abdomen. 
  The 
  posterior 
  half 
  of 
  

   the 
  2d, 
  3d, 
  4th, 
  and 
  5th 
  segments 
  is 
  marked 
  (in 
  dried 
  specimens) 
  

   with 
  a 
  deep 
  transverse 
  depression, 
  which 
  is 
  dull 
  testaceous. 
  In 
  

   the 
  living 
  insect 
  there 
  are 
  no 
  depressions, 
  but 
  testaceous 
  bands, 
  

   covered 
  with 
  a 
  soft 
  integument, 
  which 
  subsides 
  irregularly 
  after 
  

   death. 
  $ 
  5 
  . 
  Length, 
  2 
  — 
  2 
  J 
  ; 
  wings, 
  4f 
  — 
  5i 
  lines. 
  

  

  Not 
  common 
  ; 
  taken 
  by 
  Wesmael 
  in 
  Belgium, 
  by 
  

   Haliday 
  in 
  North 
  and 
  West 
  Ireland, 
  and 
  by 
  Walker 
  in 
  

   England. 
  I 
  captm^ed 
  5 
  specimens 
  at 
  Corn 
  worthy, 
  in 
  

   South 
  Devon, 
  and 
  another 
  in 
  Wiltshire. 
  

  

  3. 
  Biosteres 
  hicolor, 
  Wesm. 
  

  

  Opius 
  hicolor, 
  Wesm., 
  Nouv. 
  Mem. 
  Ac. 
  Brux., 
  1835, 
  

   p. 
  151, 
  3^ 
  ; 
  Hal., 
  Ent. 
  Mag., 
  iv., 
  220, 
  3 
  ? 
  . 
  

  

  Black 
  ; 
  abdomen, 
  after 
  the 
  1st 
  segment, 
  rufous. 
  Face 
  carinated 
  ' 
  

   clypeus 
  reaching 
  the 
  mandibles, 
  its 
  lower 
  half 
  testaceous, 
  im- 
  

   pressed 
  in 
  the 
  middle 
  with 
  a 
  transverse 
  series 
  of 
  punctm-es 
  ; 
  

   mandibles 
  testaceous 
  ; 
  palpi 
  about 
  as 
  long 
  as 
  the 
  head, 
  testaceous. 
  

   Antennae 
  3 
  longer 
  than 
  the 
  body, 
  39-jointed, 
  black 
  ; 
  1st 
  joint 
  

   rufo-testaceous 
  beneath 
  ; 
  all 
  the 
  joints 
  short 
  ; 
  antennae 
  2 
  not 
  de 
  

   sci'ibed. 
  Mesothoracic 
  sutures 
  indicated 
  by 
  a 
  short 
  deep 
  depression 
  

   on 
  each 
  side 
  of 
  the 
  mesothorax 
  in 
  front. 
  Furrow 
  of 
  the 
  meso- 
  

   pleurse 
  very 
  superficial, 
  formed 
  of 
  a 
  series 
  of 
  slight 
  transverse 
  

   wrinldes. 
  Metathorax 
  finely 
  rugulose. 
  Wings 
  hyaline 
  ; 
  stigma 
  

   dull 
  rufo-testaceous 
  ; 
  radial 
  areolet 
  reaching 
  the 
  extremity 
  of 
  the 
  

   wing 
  ; 
  2d 
  cubital 
  areolet 
  narrow 
  ; 
  podiscoidal 
  ai-eolet 
  complete. 
  

   Legs 
  rufo-testaceous. 
  First 
  abdominal 
  segment 
  black, 
  rather 
  

   shining, 
  with 
  a 
  few 
  longitudinal 
  striae 
  ; 
  the 
  rest 
  of 
  the 
  abdo- 
  

   men 
  smooth, 
  rufo-testaceous. 
  Terebra 
  concealed. 
  Length, 
  1 
  — 
  

   IJ 
  Une. 
  

  

  Only 
  two 
  examples 
  seem 
  to 
  have 
  occurred, 
  a 
  3 
  taken 
  

   by 
  Wesmael 
  near 
  Brussels, 
  and 
  a 
  ? 
  in 
  North 
  Ireland 
  by 
  

   Haliday 
  ; 
  as 
  the 
  latter 
  writer 
  gives 
  no 
  description 
  of 
  the 
  

   ? 
  , 
  it 
  may 
  be 
  presumed 
  that 
  the 
  sexes 
  are 
  similar. 
  

  

  