﻿GENERIC 
  REVISION 
  OF 
  THE 
  OPIIIOXINI 
  — 
  CUSHMAN 
  423 
  

  

  Of 
  the 
  characters 
  in 
  the 
  first 
  couplet 
  of 
  the 
  key 
  none 
  by 
  itself 
  is 
  

   entirely 
  dia<2:nostic 
  of 
  the 
  members 
  of 
  the 
  Therion 
  group 
  of 
  genera, 
  

   with 
  the 
  excei)tiou 
  of 
  the 
  recurved 
  and 
  pointed 
  or 
  narrowly 
  rounded 
  

   clypeus. 
  The 
  narrow 
  tapering 
  stigma 
  occurs 
  in 
  Stauropoctoiius 
  and 
  

   even 
  in 
  some 
  species 
  of 
  Enicospilus; 
  the 
  strongly 
  reclivous 
  nervellus 
  

   with 
  the 
  fracture 
  far 
  above 
  the 
  middle 
  in 
  several 
  genera 
  of 
  the 
  Ophion 
  

   group 
  and 
  even 
  in 
  some 
  species 
  of 
  Ophion; 
  the 
  unseparated 
  epipleura 
  

   of 
  tergite 
  2 
  in 
  Aulophion 
  (a 
  new 
  genus) 
  and 
  in 
  some 
  species 
  of 
  Eni- 
  

   cospilus; 
  while 
  the 
  broad, 
  weakly 
  twisted 
  mandible 
  differs 
  only 
  in 
  

   being 
  stouter 
  than 
  in 
  Ophion. 
  Only 
  genera 
  possessing 
  all 
  these 
  

   characters 
  properly 
  belong 
  in 
  the 
  Thyreodon 
  group. 
  

  

  Of 
  the 
  characters 
  of 
  the 
  Ophion 
  group 
  the 
  gradually 
  narrowed 
  and 
  

   weakly 
  twisted 
  mandible 
  occurs 
  also 
  in 
  Spilophion 
  and 
  even 
  in 
  a 
  few 
  

   species 
  of 
  Enicospilus, 
  which 
  genus 
  exhibits 
  all 
  degrees 
  of 
  torsion 
  

   from 
  that 
  of 
  Ophion 
  nearly 
  to 
  the 
  extreme 
  twisting 
  found 
  in 
  Stauropoc- 
  

   tonus; 
  the 
  triangular 
  stigma 
  occurs 
  in 
  Abanchogastra; 
  the 
  lack 
  of 
  the 
  

   fenestra 
  in 
  Banchogastra, 
  Pycnophion, 
  Abanchogastra, 
  and 
  Stauropoc- 
  

   tonus, 
  all 
  belonging 
  to 
  the 
  Enicospilus 
  group; 
  the 
  curved 
  abscissula 
  

   in 
  Spilophion 
  and 
  Abanchogastra. 
  

  

  The 
  strong 
  postpectoral 
  carina 
  of 
  the 
  Enicospilus 
  group 
  occurs 
  in 
  

   Aglaophion 
  of 
  the 
  Thyreodon 
  group 
  and 
  in 
  Clistorapha 
  (a 
  new 
  genus) 
  

   of 
  the 
  Ophion 
  group, 
  and 
  is 
  absent 
  in 
  Aulophion. 
  

  

  In 
  some 
  genera 
  of 
  both 
  the 
  Ophion 
  and 
  Enicospilus 
  groups 
  the 
  basal 
  

   abscissa 
  of 
  the 
  radius 
  is 
  neither 
  straight 
  and 
  unthickcned 
  as 
  in 
  Ophion 
  

   nor 
  thickened 
  hi 
  the 
  middle 
  and 
  sinuate 
  as 
  in 
  typical 
  Enicospilus, 
  but 
  

   is 
  thickened 
  and 
  curved 
  basally. 
  

  

  The 
  occipital 
  carina, 
  normally 
  complete 
  or 
  very 
  nearly 
  so, 
  is 
  entirely 
  

   lacking 
  in 
  a 
  few 
  genera 
  of 
  the 
  Ophion 
  and 
  Enicospilus 
  groups. 
  

  

  KEY 
  TO 
  THE 
  GENERA 
  OF 
  THE 
  OPHIONINI 
  

  

  1. 
  Clyj)cii3 
  more 
  or 
  less 
  distinctly 
  recurved 
  apically 
  and 
  acute 
  or 
  sharply 
  rounded 
  

  

  (rarely 
  narrowly 
  truncate) 
  (pi. 
  51, 
  figs. 
  32-3o); 
  stigma 
  (pi. 
  63, 
  fig. 
  50) 
  

   extremely 
  narrow, 
  hardly 
  broader 
  than 
  apex 
  of 
  combined 
  costa 
  and 
  sub- 
  

   costa 
  and 
  merging 
  gradually 
  into 
  metacarpus, 
  radius 
  nearly 
  at 
  base; 
  

   nervellus 
  (pi. 
  53, 
  fig. 
  50) 
  strongly 
  reclivous 
  and 
  usually 
  broken 
  distinctly 
  

   above 
  middle; 
  epipleura 
  of 
  tergite 
  2 
  not 
  distinctly 
  separated 
  from 
  tergite; 
  

   mandible 
  (pi. 
  51, 
  figs. 
  32-35) 
  very 
  broad 
  and 
  very 
  little 
  twisted 
  (see 
  

  

  couplet 
  7) 
  2 
  

  

  Clypeus 
  not 
  as 
  deacribed 
  above 
  or 
  the 
  insect 
  differs 
  by 
  one 
  or 
  more 
  of 
  tlie 
  

   other 
  characters 
  6 
  

  

  2. 
  Postpectoral 
  carina 
  incomplete 
  or 
  absent 
  (pi. 
  52, 
  figs. 
  37-39) 
  4 
  

  

  Posti>ectoral 
  carina 
  complete 
  (pi. 
  52, 
  fig. 
  30) 
  3 
  

  

  3. 
  Radius 
  basally, 
  basal 
  vein, 
  and 
  absci.ssula 
  not 
  thickened; 
  nervellus 
  broken 
  

  

  at 
  about 
  upper 
  third 
  4. 
  ABlaophion 
  Cameron 
  

  

  liadius 
  ba.sally, 
  basal 
  vein, 
  and 
  abscissula 
  thickened; 
  nervellus 
  broken 
  far 
  

   below 
  ujjper 
  third 
  5. 
  Euryophion 
  Cunieron 
  

  

  