﻿art. 
  8 
  REVISION 
  OF 
  THE 
  GENUS 
  MICROBRACON 
  MUESEBECK 
  17 
  

  

  Dorsum 
  of 
  abdomen 
  mostly 
  sculptured 
  ; 
  very 
  rarely 
  not 
  distinctly 
  sculp- 
  

   tured 
  beyond 
  second 
  tergite, 
  but 
  then 
  frons 
  is 
  finely 
  reticulately 
  sculp- 
  

   tured 
  and 
  face 
  and 
  coxae 
  are 
  yellow 
  ; 
  face 
  and 
  coxae 
  very 
  rarely 
  black 
  

   and 
  then 
  abdomen 
  is 
  distinctly 
  sculptured 
  96. 
  

  

  70. 
  Opening 
  between 
  clypeus 
  and 
  mandibles 
  unusually 
  large, 
  its 
  transverse 
  

  

  diameter 
  as 
  long 
  as, 
  or 
  longer 
  than, 
  the 
  distance 
  from 
  lower 
  margin 
  of 
  

   antennal 
  foramina 
  to 
  lower 
  margin 
  of 
  clypeus 
  ; 
  propodeum 
  with 
  a 
  complete 
  

   median 
  longitudinal 
  carina 
  ; 
  posterior 
  tarsi 
  short 
  and 
  stout, 
  shorter 
  than 
  

  

  their 
  tibiae 
  71. 
  

  

  Opening 
  between 
  clypeus 
  and 
  mandibles 
  not 
  so 
  large 
  ; 
  at 
  least 
  not 
  agreeing 
  

   entirely 
  with 
  the 
  above 
  72. 
  

  

  71. 
  Wings 
  strongly 
  infuscated 
  ; 
  last 
  segment 
  of 
  hind 
  tarsi 
  very 
  large, 
  broad- 
  

  

  ening 
  strongly 
  toward 
  apex 
  and 
  much 
  longer 
  than 
  second 
  tarsal 
  segment; 
  

  

  antennae 
  25 
  to 
  27 
  segmented 
  15. 
  gastroideae 
  (Ashmead). 
  

  

  Wings 
  hyaline 
  or 
  very 
  nearly; 
  last 
  segment 
  of 
  hind 
  tarsi 
  normal, 
  not 
  

   broadening 
  strongly 
  toward 
  apex 
  and 
  not 
  longer 
  than 
  second 
  tarsal 
  seg- 
  

   ment; 
  antennae 
  usually 
  21 
  to 
  23 
  segmented 
  16. 
  brachyurus 
  (Ashmead). 
  

  

  72. 
  Second 
  abdominal 
  tergite 
  with 
  conspicuous, 
  more 
  or 
  less 
  triangular 
  areas 
  

  

  of 
  weaker 
  chitinization 
  laterally 
  opposite 
  the 
  broad 
  membranous 
  mar- 
  

   gins 
  of 
  first 
  tergite; 
  abdomen, 
  including 
  first 
  tergite, 
  wholly 
  smooth 
  and 
  

   polished, 
  propodeum 
  completely 
  polished 
  without 
  a 
  stub 
  of 
  a 
  median 
  

  

  ridge 
  at 
  apex 
  73. 
  

  

  Second 
  abdominal 
  tergite 
  without 
  such 
  membranous 
  areas 
  laterally; 
  first 
  

   abdominal 
  tergite 
  usually 
  more 
  or 
  less 
  sculptured 
  at 
  apex 
  ; 
  propodeum 
  

   most 
  frequently, 
  though 
  not 
  always, 
  with 
  a 
  stub 
  of 
  a 
  carina 
  at 
  apex__ 
  76. 
  

  

  73. 
  Antennae 
  usually 
  23 
  to 
  26 
  segmented, 
  usually 
  shorter 
  than 
  the 
  body 
  ; 
  third 
  

  

  abscissa 
  of 
  radius 
  distinctly 
  longer 
  than 
  the 
  first 
  and 
  second 
  abscissae 
  

   combined 
  and 
  about 
  twice 
  as 
  long 
  as 
  the 
  second 
  ; 
  last 
  abscissa 
  of 
  cubitus 
  

   distinctly 
  longer 
  than 
  the 
  preceding 
  abscissa; 
  wings 
  usually 
  rather 
  

  

  strongly 
  dusky 
  74. 
  

  

  Antennae 
  usually 
  28 
  to 
  32 
  segmented, 
  longer 
  than 
  the 
  body 
  ; 
  third 
  abscissa 
  

   of 
  radius 
  not 
  distinctly 
  longer 
  than 
  the 
  first 
  and 
  second 
  combined 
  and 
  

   not 
  nearly 
  twice 
  as 
  long 
  as 
  the 
  second 
  ; 
  last 
  abscissa 
  of 
  cubitus 
  not 
  dis- 
  

   tinctly 
  longer 
  than 
  the 
  preceding; 
  wings 
  faintly 
  infuscated 
  75. 
  

  

  74. 
  Head, 
  thorax, 
  and 
  abdomen 
  yellowish, 
  sometimes 
  with 
  fuscous 
  markings; 
  

  

  legs 
  yellow 
  ; 
  second 
  abdominal 
  tergite 
  usually 
  as 
  long 
  as 
  third, 
  or 
  

  

  nearly 
  29. 
  rudbeckiae, 
  new 
  species. 
  

  

  Head, 
  thorax, 
  and 
  abdomen, 
  black; 
  legs 
  black; 
  second 
  abdominal 
  tergite 
  

   usually 
  much 
  shorter 
  than 
  third 
  30. 
  temiiceps, 
  new 
  species. 
  

  

  75. 
  Head 
  and 
  thorax 
  black; 
  abdomen 
  mostly 
  black; 
  legs 
  more 
  or 
  less 
  black- 
  

  

  ish 
  17. 
  melanaspis 
  (Ashmead). 
  

  

  Head, 
  thorax, 
  and 
  abdomen 
  mostly 
  yellowish; 
  legs 
  yellowish. 
  

  

  18. 
  juncicola 
  (Ashmead). 
  

  

  76. 
  Frons 
  entirely, 
  and 
  usually 
  the 
  vertex 
  to 
  some 
  extent, 
  closely 
  minutely 
  

  

  punctate 
  or 
  reticulate 
  and 
  opaque 
  ; 
  parapsidal 
  grooves 
  completely 
  thickly 
  

   hairy; 
  head 
  black 
  with 
  contrasting 
  yellow 
  orbital 
  lines; 
  thorax 
  short 
  

  

  and 
  stout, 
  black 
  ; 
  wings 
  rather 
  strongly 
  infuscated 
  77. 
  

  

  Frons 
  usually 
  smooth 
  and 
  polished, 
  rarely 
  with 
  faint 
  sculpture 
  just 
  above 
  

   insertion 
  of 
  antennae 
  ; 
  at 
  least 
  not 
  exactly 
  as 
  above 
  78. 
  

  

  77. 
  Second 
  abdominal 
  tergite 
  usually 
  smooth 
  and 
  polished, 
  and 
  provided 
  with 
  

  

  two 
  distinct 
  short 
  oblique 
  foveolate 
  impressions 
  medially 
  toward 
  base; 
  

   antennae 
  usually 
  21 
  to 
  24 
  segmented; 
  middle 
  lobe 
  of 
  mososcutum 
  with 
  

   scattered 
  pubescence 
  arising 
  from 
  its 
  surface 
  anteriorly. 
  

  

  19. 
  politiventris 
  (Cushman). 
  

  

  