﻿PROCEEDINGS 
  OF 
  THE 
  UNITED 
  STATES 
  NATIONAL 
  MUSEUM 
  

  

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  SMITHSONIAN 
  INSTITUTION 
  

  

  U. 
  S. 
  NATIONAL 
  MUSEUM 
  

  

  Vol. 
  96 
  Washington: 
  1947 
  No. 
  3206 
  

  

  A 
  GENERIC 
  REVISION 
  OF 
  THE 
  ICHNEUMON-FLIES 
  OF 
  

   THE 
  TRIBE 
  OPHIONINl 
  

  

  By 
  R. 
  A. 
  CusHMAN 
  

  

  A 
  NUMBER 
  of 
  years 
  ago 
  I 
  planned 
  a 
  revision 
  of 
  the 
  North 
  American 
  

   species 
  of 
  the 
  hymcnoptcrous 
  genus 
  Ophion 
  and 
  to 
  that 
  end 
  assembled 
  

   from 
  many 
  sources 
  a 
  great 
  number 
  of 
  specimens. 
  Study 
  of 
  this 
  

   material 
  made 
  it 
  evident 
  that 
  Ophion 
  as 
  we 
  had 
  known 
  it 
  was 
  made 
  

   up 
  of 
  several 
  more 
  or 
  less 
  discordant 
  elements 
  and 
  indicated 
  the 
  need 
  

   of 
  a 
  generic 
  revision 
  of 
  the 
  tribe 
  Ophionini. 
  This 
  was 
  undertaken, 
  

   with 
  the 
  results 
  set 
  forth 
  in 
  the 
  following 
  pages. 
  

  

  Unfortunately, 
  representatives 
  of 
  a 
  considerable 
  number 
  of 
  the 
  

   described 
  genera 
  have 
  been 
  unavailable 
  to 
  me, 
  and 
  some 
  of 
  these 
  I 
  

   have 
  found 
  impossible 
  to 
  place 
  in 
  my 
  arrangement 
  because 
  of 
  the 
  

   inadequacy 
  of 
  the 
  descriptions. 
  Several, 
  however, 
  1 
  have 
  been 
  

   enabled 
  to 
  place 
  through 
  the 
  generous 
  cooperation 
  of 
  J. 
  F. 
  Perkins, 
  

   of 
  the 
  British 
  Museum. 
  Such 
  characters 
  as 
  the 
  possession 
  or 
  lack 
  of 
  

   (he 
  postpccU>ral 
  carina, 
  the 
  position 
  of 
  the 
  second 
  abdominal 
  spiracle, 
  

   the 
  presence 
  or 
  absence 
  of 
  a 
  fenestra 
  when 
  scleromes 
  are 
  lacking, 
  and 
  

   even 
  the 
  form 
  of 
  the 
  mandibles 
  and 
  the 
  course 
  of 
  the 
  radius 
  are, 
  in 
  

   many 
  cases, 
  not 
  referred 
  to 
  in 
  generic 
  descriptions; 
  and 
  every 
  descrip- 
  

   tion 
  omits 
  mention 
  of 
  one 
  or 
  more 
  of 
  the 
  series 
  of 
  (characters 
  which 
  I 
  

   have 
  chosen 
  for 
  use 
  as 
  generic 
  group 
  characters. 
  Most 
  of 
  the 
  genera 
  

   of 
  which 
  no 
  identified 
  specimens 
  arc 
  available 
  and 
  of 
  which 
  I 
  have 
  

   been 
  unable 
  to 
  identify 
  any 
  species 
  in 
  the 
  large 
  amount 
  of 
  material 
  

   bi.'fore 
  me 
  are 
  not 
  included 
  in 
  the 
  key 
  to 
  genera. 
  However, 
  the 
  

   probable 
  aflinitics 
  of 
  each 
  arc 
  discussed. 
  

  

  417 
  

  

  