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  Cockerell 
  — 
  Fossil 
  Parasitic 
  Hymenoptera. 
  

  

  antennae 
  dark; 
  abdomen 
  pale 
  ferruginous; 
  legs 
  ferru- 
  

   ginous, 
  hind 
  femora 
  very 
  stout; 
  wings 
  perfectly 
  clear, 
  

   stigma 
  and 
  nervures 
  ferruginous. 
  Grooves 
  on 
  mesotho- 
  

   rax 
  finely 
  beaded. 
  The 
  shape 
  of 
  the 
  head 
  cannot 
  be 
  ascer- 
  

   tained, 
  as 
  only 
  the 
  upper 
  side 
  is 
  presented, 
  but 
  this, 
  with 
  

   the 
  scape, 
  resembles 
  that 
  of 
  B. 
  vulgaris 
  (Cresson). 
  The 
  

   flagellum 
  also 
  shows 
  the 
  same 
  delicate 
  longitudinal 
  flut- 
  

   ing 
  of 
  the 
  joints, 
  but 
  the 
  joints 
  are 
  distinctly 
  longer, 
  the 
  

   middle 
  joints 
  at 
  least 
  1-5 
  as 
  long 
  as 
  wide. 
  

  

  Florissant 
  (H. 
  F. 
  Wickham). 
  This 
  differs 
  from 
  the 
  

   modern 
  Br 
  aeon 
  (Cremnops 
  Foerster) 
  in 
  the 
  hyaline 
  

   wings, 
  and 
  as 
  the 
  elongate 
  form 
  of 
  the 
  head 
  cannot 
  be 
  

   demonstrated, 
  it 
  is 
  possibly 
  a 
  member 
  of 
  the 
  tribe 
  Micro- 
  

   dini 
  (Bassinse 
  of 
  Viereck), 
  where 
  it 
  might 
  fall 
  near 
  

   Crassomicrodus 
  Ashmead, 
  being 
  separated 
  by 
  the 
  quad- 
  

   rangular 
  areolet. 
  Among 
  the 
  described 
  Florissant 
  fos- 
  

   sils, 
  it 
  is 
  nearest 
  to 
  the 
  larger 
  Agathis 
  saxatilis 
  Brues, 
  

   which 
  is 
  perhaps 
  not 
  a 
  true 
  Agathis. 
  From 
  this, 
  it 
  will 
  

   readily 
  be 
  known 
  by 
  the 
  confluent 
  first 
  cubital 
  and 
  first 
  

   discoidal 
  cells, 
  and 
  the 
  pale 
  veins 
  and 
  light 
  red 
  abdomen. 
  

   The 
  Florissant 
  fossils 
  described 
  under 
  Bracon 
  by 
  Brues 
  

   (Bull. 
  Mus. 
  Comp. 
  Zool., 
  54) 
  will 
  stand 
  as 
  Microbracon 
  

   cockerelli, 
  M. 
  abstractus 
  and 
  M. 
  resurrectus. 
  

  

  University 
  of 
  Colorado, 
  

   Boulder, 
  Colorado. 
  

  

  