﻿18 
  Eev. 
  T. 
  A. 
  Marshall's 
  Monograph 
  of 
  

  

  horizontally 
  elongate, 
  the 
  upper 
  side 
  being 
  never 
  longer 
  

   than 
  the 
  inner 
  side. 
  LHachasma 
  and 
  Biosteres 
  agree 
  in 
  

   the 
  form 
  of 
  the 
  2d 
  cubital 
  areolet, 
  but 
  differ 
  in 
  the 
  stigma, 
  

   which 
  in 
  Biosteres 
  is 
  elongate, 
  like 
  that 
  of 
  Opius. 
  No 
  

   other 
  structural 
  differences 
  of 
  importance 
  appear 
  to 
  exist, 
  

   and 
  perhaps 
  the 
  separation 
  of 
  Diachasma 
  and 
  Biosteres 
  

   from 
  Opius 
  is 
  a 
  needless 
  refinement. 
  

  

  Of 
  the 
  40 
  species 
  about 
  to 
  be 
  described 
  in 
  this 
  genus, 
  

   ochrogaster, 
  ruficeps, 
  and 
  testaceus, 
  Wesm., 
  were 
  unknown 
  

   to 
  Haliday 
  ; 
  contpar 
  and 
  zelotes 
  are 
  new 
  species. 
  Not 
  

   being 
  possessed 
  of 
  all 
  the 
  species, 
  I 
  have 
  been 
  unable 
  to 
  

   complete 
  several 
  of 
  the 
  existing 
  descriptions, 
  in 
  which 
  

   important 
  characters 
  are 
  sometimes 
  omitted. 
  

  

  Table 
  of 
  Species. 
  

  

  (42) 
  1. 
  Furrow 
  of 
  the 
  mesopleurHe 
  smooth, 
  im- 
  

   punctate, 
  or 
  obsolete. 
  

  

  (41) 
  2. 
  Kecurrent 
  nervure 
  evected; 
  seldom 
  in- 
  

   terstitial 
  or 
  subinterstitial. 
  

  

  (20) 
  3. 
  Mesothorax 
  •without 
  a 
  punctiform 
  im- 
  

   pression 
  before 
  the 
  scutellum. 
  

  

  (17) 
  4. 
  Clypeus 
  not 
  reaching 
  the 
  mandibles 
  ; 
  

   mouth 
  open. 
  

  

  (6) 
  5. 
  First 
  abdominal 
  segment 
  smooth, 
  with- 
  

  

  out 
  sculpture 
  .. 
  .. 
  .. 
  ..1. 
  lutjenSj'H.&l. 
  

  

  (5) 
  6. 
  First 
  abdominal 
  segment 
  more 
  or 
  less 
  

   rimulose 
  or 
  rugulose. 
  

  

  (8) 
  7. 
  Antenna 
  19-jointed 
  . 
  . 
  . 
  . 
  . 
  . 
  2. 
  pendulus, 
  Hal. 
  

  

  (7) 
  8. 
  Antenn.ie 
  with 
  more 
  than 
  19 
  joints. 
  

  

  (12) 
  9. 
  Antenna 
  21— 
  28-jointed. 
  

  

  (11) 
  10. 
  Antennae 
  21 
  — 
  23-jointed, 
  not 
  longer 
  

  

  than 
  the 
  body, 
  even 
  in 
  the 
  (^ 
  ; 
  terebra 
  

  

  2 
  equal 
  to 
  one-half 
  or 
  two-thirds 
  of 
  

  

  the 
  abdomen; 
  legs 
  stout 
  .. 
  .. 
  3. 
  j^!/r//»«a 
  (or, 
  Nees. 
  

  

  (10) 
  11. 
  Antennas 
  27 
  — 
  28-jointed, 
  longer 
  than 
  

  

  the 
  body, 
  in 
  the 
  ^ 
  ; 
  terebra 
  J 
  hardly 
  

  

  as 
  long 
  as 
  the 
  last 
  segment 
  of 
  the 
  

  

  abdomen; 
  legs 
  slender 
  .. 
  ..4. 
  apiculator, 
  l^eee. 
  

  

  (9) 
  12. 
  Antennae 
  31— 
  34- 
  jointed. 
  

  

  (14) 
  13. 
  Legs 
  rufous 
  .. 
  .. 
  .. 
  ..5. 
  cZarus, 
  Hal. 
  

  

  (13) 
  14. 
  Legs 
  flavo-testaceous. 
  

  

  (16) 
  15. 
  Antennae 
  broadly 
  testaceous 
  at 
  the 
  base 
  6. 
  victits, 
  Hal. 
  

  

  (15) 
  16. 
  Antennffi 
  with 
  only 
  the 
  scape 
  pale 
  . 
  . 
  7. 
  spretus, 
  Hal. 
  

   (4) 
  17. 
  Clypeus 
  reaching 
  the 
  mandibles 
  and 
  

  

  closing 
  the 
  mouth. 
  

   (19) 
  18. 
  Upper 
  side 
  of 
  the 
  2d 
  cubital 
  areolet 
  

   distinctly 
  longer 
  than 
  the 
  inner 
  side; 
  

   antennre 
  30-jointed 
  . 
  . 
  . 
  . 
  . 
  . 
  8. 
  tacitns, 
  Hal. 
  

  

  