﻿18 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.67 
  

  

  Second 
  abdominal 
  tergite 
  usually 
  finely 
  sculptured 
  over 
  nearly 
  its 
  entire 
  

   surface 
  and 
  without 
  such 
  impressions 
  toward 
  the 
  base 
  ; 
  antennae 
  nor- 
  

   mally 
  24 
  to 
  29-segmented 
  ; 
  surface 
  of 
  middle 
  lobe 
  entirely 
  destitute 
  of 
  

   pubescence 
  although 
  the 
  long 
  hairs 
  arising 
  in 
  the 
  parapsidal 
  grooves 
  lie 
  

   upon 
  the 
  lobes 
  20. 
  pygmaeus 
  (Provancher). 
  

  

  78. 
  Head 
  thin 
  antero-posteriorly, 
  hardly 
  longer 
  at 
  the 
  intersection 
  of 
  the 
  anten- 
  

  

  nae 
  than 
  at 
  the 
  clypeus, 
  the 
  face 
  not 
  strongly 
  receding 
  ; 
  thorax 
  rather 
  

   stout 
  ; 
  propodeum 
  completely 
  smooth 
  and 
  polished, 
  without 
  even 
  a 
  stub 
  of 
  

   a 
  median 
  ridge 
  posteriorly 
  ; 
  wings 
  rather 
  strongly 
  infuscated 
  on 
  basal 
  

  

  half 
  i 
  79. 
  

  

  Head 
  not 
  thin, 
  rather 
  prominent 
  just 
  below 
  insertion 
  of 
  antennae, 
  the 
  face 
  

   receding 
  ; 
  propodeum 
  most 
  frequently 
  with 
  a 
  distinct 
  short 
  stub 
  of 
  a 
  

   median 
  ridge 
  at 
  apex 
  81. 
  

  

  79. 
  Parapsidal 
  grooves 
  rather 
  thickly 
  hairy 
  posteriorly 
  ; 
  all 
  coxae 
  and 
  more 
  or 
  

  

  less 
  of 
  remainder 
  of 
  legs, 
  black 
  ; 
  first 
  abscissa 
  of 
  radius 
  usually 
  nearly 
  as 
  

   long 
  as 
  first 
  intercubitus 
  and 
  much 
  more 
  than 
  half 
  the 
  second 
  abscissa 
  

  

  of 
  radius 
  21. 
  connecticutorum 
  Viereck. 
  

  

  Parapsidal 
  grooves 
  exceedingly 
  sparsely 
  hairy 
  80. 
  

  

  80. 
  Second 
  abdominal 
  tergite 
  usually 
  with 
  a 
  rather 
  prominent 
  polished 
  basal 
  

  

  median 
  area 
  and 
  with 
  some 
  sculpture 
  adjoining 
  this 
  ; 
  coxae 
  and 
  more 
  or 
  

  

  less 
  of 
  remainder 
  of 
  legs 
  black 
  31. 
  nuperus 
  (Cresson). 
  

  

  Second 
  abdominal 
  tergite, 
  like 
  remainder 
  of 
  abdomen, 
  completely 
  polished 
  ; 
  

   legs, 
  including 
  all 
  coxae, 
  usually 
  uniformly 
  yellowish-red 
  or 
  reddish- 
  

   brown 
  32. 
  curtus 
  (Provancher). 
  

  

  81. 
  Abdomen 
  wholly 
  smooth 
  and 
  polished, 
  the 
  second 
  tergite 
  with 
  two 
  short 
  

  

  oblique 
  furrows 
  setting 
  off 
  a 
  basal 
  median 
  area 
  ; 
  parapsidal 
  furrows 
  

   thickly 
  hairy 
  ; 
  head 
  more 
  than 
  usually 
  thick 
  antero-posteriorly 
  ; 
  antennae 
  

   usually 
  29 
  to 
  32 
  segmented, 
  tapering 
  distinctly 
  toward 
  tip; 
  face 
  yellow; 
  

   body 
  usually 
  mostly 
  yellow 
  ; 
  legs 
  yellow, 
  posterior 
  coxae 
  sometimes 
  a 
  

  

  little 
  infuscated 
  22. 
  psilocorsi 
  Viereck. 
  

  

  Abdomen 
  rarely 
  entirely 
  smooth 
  and 
  polished, 
  and 
  then 
  not 
  agreeing 
  com- 
  

   pletely 
  with 
  the 
  above 
  characters 
  82. 
  

  

  82. 
  Legs 
  including 
  all 
  coxae 
  bright 
  yellow 
  ; 
  antennae 
  never 
  stout, 
  all 
  flagellar 
  

  

  segments 
  decidedly 
  longer 
  than 
  broad 
  ; 
  suturiform 
  articulation 
  always 
  

  

  very 
  fine 
  ; 
  wings 
  frequently 
  hyaline 
  83. 
  

  

  Legs 
  dark 
  brown 
  or 
  blackish 
  ; 
  coxae 
  black 
  or 
  blackish 
  ; 
  wings 
  distinctly 
  

   infuscated 
  88. 
  

  

  83. 
  Propodeum 
  usually 
  with 
  a 
  complete 
  or 
  nearly 
  complete 
  median 
  longitudinal 
  

  

  carina 
  ; 
  second 
  and 
  third 
  tergites 
  finely 
  sculptured 
  ; 
  first 
  abdominal 
  ter- 
  

   gite 
  mostly 
  rugose 
  23. 
  meromyzae 
  (Gahan). 
  

  

  Propodeum 
  smooth 
  and 
  polished 
  with 
  only 
  a 
  short 
  stub 
  of 
  a 
  median 
  ridge 
  

   posteriorly 
  ; 
  third 
  tergite 
  always 
  entirely 
  smooth 
  and 
  polished 
  84. 
  

  

  84. 
  Abdomen 
  entirely 
  polished 
  with 
  no 
  indication 
  of 
  sculpture 
  ; 
  wings 
  per- 
  

  

  fectly 
  clear 
  hyaline 
  ; 
  face 
  yellow 
  ; 
  thorax 
  and 
  abdomen 
  usually 
  en- 
  

   tirely 
  yellow 
  27. 
  angelesius 
  (Provancher). 
  

  

  Second 
  abdominal 
  tergite 
  nearly 
  always 
  a 
  little 
  sculptured 
  ; 
  face 
  black 
  ; 
  

   thorax 
  and 
  more 
  or 
  less 
  of 
  abdomen 
  black 
  85. 
  

  

  85. 
  First 
  abscissa 
  of 
  radius 
  about 
  as 
  long 
  as 
  inner 
  side 
  of 
  stigma 
  and 
  nearly 
  

  

  as 
  long 
  as 
  first 
  intercubitus 
  ; 
  second 
  abscissa 
  of 
  radius 
  not 
  twice 
  the 
  

   first 
  ; 
  wings 
  distinctly 
  fuscous 
  on 
  basal 
  two-thirds 
  ; 
  flagellar 
  segments 
  

  

  of 
  antennae 
  not 
  twice 
  as 
  long 
  as 
  thick 
  67. 
  cinctus 
  (Provancher). 
  

  

  Not 
  agreeing 
  entirely 
  with 
  the 
  above 
  86. 
  

  

  