﻿468 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.96 
  

  

  present, 
  with 
  or 
  without 
  scleromes, 
  rarely 
  small 
  and 
  poorly 
  defined; 
  

   abscissula 
  straight; 
  nervellus 
  broken 
  below 
  (rarely 
  at) 
  middle, 
  upper 
  

   abscissa 
  usually 
  inclivous. 
  Legs 
  with 
  middle 
  and 
  hind 
  trochanters 
  not 
  

   toothed 
  apically; 
  pectination 
  of 
  claws 
  normal 
  (pi. 
  55, 
  fig. 
  80). 
  

  

  Abdomen 
  (pi. 
  56, 
  figs. 
  100, 
  101): 
  Tergite 
  2 
  without 
  an 
  umbo, 
  its 
  

   spiracles 
  usually 
  at 
  or 
  near 
  apical 
  third, 
  epipleura 
  usually 
  completely 
  

   separated 
  and 
  infolded, 
  very 
  rarely 
  partially 
  or 
  entirely 
  unseparated. 
  

  

  In 
  some 
  of 
  the 
  characters 
  herein 
  treated 
  as 
  making 
  up 
  a 
  combination 
  

   that 
  identifies 
  an 
  Enicospilus, 
  especially 
  in 
  those 
  of 
  the 
  wings, 
  there 
  

   is 
  considerable 
  variation. 
  Most 
  of 
  the 
  synonyms 
  listed 
  above 
  are 
  

   based 
  on 
  variations 
  of 
  wing 
  characters. 
  

  

  The 
  stigma, 
  typically 
  almost 
  parallel-sided 
  with 
  a 
  rather 
  abrupt 
  

   apical 
  taper, 
  occasionally 
  is 
  like 
  that 
  of 
  Thyreodon, 
  extremely 
  long 
  

   and 
  slender 
  and 
  merging 
  imperceptibly 
  with 
  the 
  metacarpus. 
  The 
  

   basal 
  abscissa 
  of 
  the 
  radius 
  exhibits 
  variation 
  from 
  marked 
  curvature 
  

   and 
  undulation 
  even 
  exceeding 
  that 
  of 
  the 
  genotype 
  of 
  Dicamptus 
  to 
  

   the 
  straightness 
  and 
  slenderness 
  of 
  that 
  typical 
  of 
  Ophion. 
  The 
  

   fenestra 
  varies 
  from 
  a 
  very 
  small 
  and 
  poorly 
  defined 
  one, 
  as 
  in 
  Ophio- 
  

   morpha 
  concolor 
  Szepligeti, 
  to 
  one 
  occupying 
  most 
  of 
  the 
  apical 
  part 
  

   of 
  the 
  discocubital 
  cell 
  and 
  with 
  all 
  of 
  the 
  structures 
  distinct; 
  some 
  

   species 
  lack 
  scleromes 
  entirely, 
  others 
  have 
  from 
  one 
  to 
  six. 
  If 
  only 
  

   one 
  sclerome 
  is 
  present 
  it 
  may 
  be 
  either 
  the 
  proximal 
  or 
  the 
  distal 
  one, 
  

   or 
  the 
  quadra 
  may 
  be 
  faintly 
  sclerotized 
  over 
  most 
  of 
  its 
  surface. 
  

   Other 
  marked 
  differences 
  are 
  exhibited 
  in 
  the 
  course 
  or 
  form 
  of 
  the 
  

   discocubitus, 
  the 
  shape 
  of 
  the 
  second 
  discoidal 
  cell, 
  the 
  proportional 
  

   lengths 
  of 
  the 
  veins 
  of 
  the 
  transverse 
  brace, 
  the 
  strength 
  of 
  the 
  post- 
  

   pectoral 
  carina 
  (rarely 
  interrupted 
  medially), 
  and 
  the 
  form 
  and 
  

   sculpture 
  of 
  the 
  propodeum. 
  In 
  a 
  very 
  large 
  majority 
  of 
  the 
  species 
  

   the 
  spiracles 
  of 
  tergite 
  2 
  are 
  at 
  or 
  near 
  the 
  apical 
  third, 
  but 
  in 
  a 
  few 
  

   unusually 
  stout 
  species 
  they 
  are 
  much 
  closer 
  to, 
  though 
  still 
  distinctly 
  

   beyond, 
  the 
  middle. 
  Such 
  species 
  also 
  tend 
  to 
  a 
  lack 
  of 
  definite 
  

   separation 
  between 
  the 
  second 
  tergite 
  and 
  its 
  epipleura, 
  whereas 
  

   typically 
  the 
  epipleura 
  are 
  completely 
  separated 
  and 
  inflexed; 
  other 
  

   species 
  exhibit 
  partial 
  separation, 
  the 
  basal 
  half 
  or 
  more 
  of 
  the 
  epi- 
  

   pleuron 
  being 
  separated 
  and 
  inflexed 
  and 
  the 
  apical 
  portion 
  not 
  

   clearly 
  separated 
  and 
  not 
  mflexed. 
  Typically 
  the 
  mandible 
  is 
  abruptly 
  

   narrowed 
  before 
  the 
  middle 
  and 
  so 
  twisted 
  that 
  the 
  two 
  teeth 
  are 
  in 
  a 
  

   plane 
  nearly 
  vertical 
  to 
  the 
  longitudinal 
  body 
  axis, 
  but 
  the 
  variation 
  

   in 
  its 
  form 
  extends 
  all 
  the 
  way 
  from 
  nearly 
  the 
  condition 
  found 
  in 
  

   Stauropoctonus, 
  with 
  the 
  torsion 
  so 
  great 
  that 
  the 
  upper 
  tooth 
  appears 
  

   to 
  be 
  on 
  the 
  inner 
  margin, 
  to 
  nearly 
  that 
  in 
  Ophion, 
  with 
  less 
  torsion 
  

   and 
  gradual 
  taper 
  from 
  base 
  to 
  apex 
  as 
  exhibited 
  by 
  Enicospilus 
  

   flavoplagiatus 
  Cushman. 
  

  

  