﻿art. 
  8 
  REVISION 
  OF 
  THE 
  GENUS 
  MICROBRACON 
  MUESEBECK 
  75 
  

  

  tennae 
  ; 
  transverse 
  diameter 
  of 
  the 
  opening 
  between 
  clypeus 
  and 
  man- 
  

   dibles 
  very 
  much 
  greater 
  than 
  the 
  distance 
  from 
  the 
  opening 
  to 
  the 
  

   eyes, 
  and 
  at 
  least 
  one 
  and 
  one-half 
  times 
  as 
  long 
  as 
  the 
  malar 
  

   space; 
  face 
  and 
  frons 
  very 
  delicately 
  punctate; 
  antennae 
  usually 
  27 
  

   to 
  33-segmented, 
  slender, 
  usually 
  as 
  long 
  as 
  the 
  body, 
  the 
  first 
  flagellar 
  

   segment 
  about 
  twice 
  as 
  long 
  as 
  broad; 
  thorax 
  smooth 
  and 
  polished; 
  

   propodeum 
  finely 
  reticulate 
  or 
  minutely 
  granular 
  and 
  opaque 
  or 
  sub- 
  

   opaque; 
  second 
  abscissa 
  of 
  radius 
  hardly 
  twice 
  as 
  long 
  as 
  the 
  first, 
  

   the 
  third 
  a 
  little 
  longer 
  than 
  the 
  first 
  and 
  second 
  combined; 
  last 
  

   abscissa 
  of 
  cubitus 
  longer 
  than 
  the 
  preceding 
  abscissa; 
  abdomen 
  

   long-oval 
  ; 
  first 
  tergite 
  rugulose 
  laterally 
  and 
  at 
  apex 
  ; 
  second 
  tergite 
  

   large, 
  about 
  as 
  long 
  as 
  third, 
  and 
  about 
  twice 
  as 
  broad 
  at 
  base 
  as 
  

   long, 
  granular, 
  often 
  a 
  little 
  rugulose 
  medially; 
  third, 
  fourth, 
  and 
  

   fifth 
  tergites, 
  and 
  sometimes 
  the 
  sixth, 
  exceedingly 
  delicately 
  sculp- 
  

   tured; 
  ovipositor 
  sheaths 
  nearly 
  as 
  long 
  as 
  the 
  dorsum 
  of 
  the 
  abdo- 
  

   men 
  beyond 
  first 
  tergite. 
  Yellow 
  ; 
  usually 
  the 
  frons, 
  vertex, 
  occiput 
  

   and 
  mesonotal 
  lobes 
  more 
  or 
  less 
  black; 
  even 
  in 
  the 
  specimens 
  which 
  

   have 
  these 
  parts 
  deep 
  black, 
  the 
  propodeum 
  and 
  the 
  abdomen 
  in- 
  

   cluding 
  first 
  tergite 
  are 
  almost 
  invariably 
  yellow 
  ; 
  wings 
  very 
  slightly 
  

   dusky 
  ; 
  legs 
  including 
  coxae, 
  yellow, 
  the 
  apical 
  tarsal 
  segment 
  black. 
  

  

  Male. 
  — 
  Antennae 
  of 
  allotype 
  31-segmented; 
  other 
  males 
  vary 
  in 
  

   this 
  respect, 
  the 
  number 
  of 
  segments 
  being 
  usually 
  27 
  to 
  32. 
  Some- 
  

   times 
  the 
  thorax 
  is 
  almost 
  entirely 
  black, 
  although 
  usually 
  at 
  least 
  

   the 
  pectus 
  and 
  the 
  propodeum 
  are 
  pale 
  ; 
  face 
  occasionally 
  with 
  a 
  quad- 
  

   rate 
  blackish 
  spot. 
  In 
  some 
  specimens 
  the 
  fourth 
  and 
  following 
  

   abdominal 
  tergites 
  are 
  entirely 
  polished. 
  

  

  Type.— 
  Cat. 
  No. 
  26668, 
  U.S.N.M. 
  

  

  Type-locality. 
  — 
  Sioux 
  City, 
  Iowa. 
  

  

  Host. 
  — 
  " 
  Geraeus 
  larva 
  in 
  Panicum." 
  

  

  Described 
  from 
  eight 
  female 
  and 
  three 
  male 
  specimens 
  reared 
  by 
  

   C. 
  N. 
  Ainslie 
  in 
  the 
  Bureau 
  of 
  Entomology, 
  under 
  Webster 
  No. 
  

   8885. 
  In 
  addition 
  to 
  the 
  type 
  series 
  there 
  is 
  considerable 
  material 
  

   in 
  the 
  National 
  Museum, 
  all 
  of 
  it 
  reared 
  from 
  Panicum 
  by 
  C. 
  N. 
  

   Ainslie, 
  at 
  Sioux 
  City, 
  Iowa 
  and 
  Elk 
  Point, 
  South 
  Dakota. 
  

  

  65. 
  MICROBRACON 
  LUTUS 
  (Provancher) 
  

  

  Bracon 
  lutus 
  Provancher, 
  Natural. 
  Canad., 
  vol. 
  12, 
  18S0, 
  p. 
  142. 
  

   Dracon 
  lixi 
  Ashmead, 
  Canad. 
  Ent, 
  vol. 
  25, 
  1893, 
  p. 
  67. 
  

  

  Type. 
  — 
  In 
  the 
  Museum 
  of 
  Public 
  Instruction 
  at 
  Quebec, 
  Canada. 
  

   The 
  type 
  of 
  lixi 
  is 
  in 
  the 
  United 
  States 
  National 
  Museum 
  (Cat. 
  No. 
  

   2145). 
  

  

  Very 
  closely 
  related 
  to 
  variabilis 
  and 
  often 
  very 
  difficult 
  to 
  distin- 
  

   guish 
  from 
  that 
  species; 
  it 
  is 
  generally 
  more 
  robust, 
  has 
  longer 
  an- 
  

   tennae, 
  a 
  slightly 
  longer 
  malar 
  space, 
  and 
  usually 
  slightly 
  shorter 
  

   ovipositor 
  sheaths. 
  A 
  study 
  of 
  the 
  types 
  of 
  lutus 
  and 
  lixi 
  has 
  con- 
  

  

  