﻿67 
  

  

  42 
  (41) 
  Frontal 
  spot 
  and 
  tegulac 
  not 
  red. 
  

  

  43 
  (46) 
  Apical 
  margins 
  of 
  two 
  basal 
  abdominal 
  segments 
  yellow 
  or 
  

  

  whitish 
  a7id 
  either 
  the 
  clypeus 
  is 
  only 
  lightly 
  emarginate, 
  or 
  

   if 
  rather 
  strongly 
  then 
  the 
  second 
  segment 
  of 
  the 
  abdomen 
  

   is 
  somewhat 
  strongly 
  and 
  abruptly 
  raised 
  from 
  the 
  base; 
  

   in 
  the 
  male 
  at 
  least 
  into 
  a 
  conical 
  tuberculate 
  form. 
  

  

  44 
  (45) 
  Second 
  segment 
  of 
  abdomen 
  above 
  simple, 
  beneath 
  not 
  

  

  abruptly 
  raised 
  from 
  the 
  apices 
  of 
  the 
  costae. 
  

  

  O. 
  nubicola, 
  P. 
  

  

  45 
  (44) 
  Second 
  segment 
  above 
  raised 
  from 
  the 
  base; 
  beneath 
  abruptly 
  

  

  elevated 
  from 
  the 
  apices 
  of 
  the 
  costae. 
  O. 
  nivicola, 
  P. 
  

  

  46 
  (43) 
  Abdomen 
  often 
  black 
  or 
  with 
  one 
  yellow 
  band, 
  if 
  with 
  two 
  

  

  bands 
  then 
  the 
  clypeus 
  is 
  deeply 
  or 
  very 
  deeply 
  emarginate 
  

   and 
  the 
  second 
  dorsal 
  segment 
  of 
  the 
  abdomen 
  is 
  simply 
  

   convex, 
  never 
  abruptly 
  raised 
  from 
  the 
  base 
  into 
  a 
  sub- 
  

   tuberculate 
  conical 
  form. 
  

  

  47 
  (52) 
  Second 
  ventral 
  segment 
  fiat 
  or 
  nearly 
  so 
  behind 
  the 
  costae 
  and 
  

  

  without 
  any 
  depression, 
  the 
  basal 
  part 
  tumid 
  and 
  either 
  the 
  

   costae 
  are 
  extremely 
  short 
  compared 
  with 
  the 
  basal 
  part, 
  

   or 
  the 
  apex 
  of 
  the 
  clypeus 
  and 
  mandibles 
  are 
  both 
  red. 
  

  

  48 
  (49) 
  Apex 
  of 
  clypeus 
  and 
  mandibles 
  both 
  red. 
  O. 
  eupteryx, 
  P. 
  

  

  49 
  (48) 
  Apex 
  of 
  clypeus 
  not 
  red. 
  

  

  50 
  (51) 
  Propodeum 
  shining. 
  O. 
  brevicostatus, 
  P.* 
  

  

  51 
  (50) 
  Propodeum 
  dull 
  (middle 
  tibiae 
  without 
  a 
  calcar). 
  

  

  Nesodynerus 
  paractias, 
  sp. 
  nov. 
  

  

  52 
  (47) 
  Second 
  ventral 
  segment 
  in 
  most 
  species 
  with 
  a 
  more 
  or 
  less 
  

  

  distinct 
  depression 
  behind 
  the 
  costae, 
  which 
  are 
  never 
  

   excessively 
  short, 
  nor 
  is 
  the 
  basal 
  part 
  very 
  largely 
  devel- 
  

   oped 
  and 
  tumid, 
  nor 
  is 
  the 
  apex 
  of 
  the 
  clypeus 
  ever 
  red. 
  

  

  53 
  (70) 
  Males; 
  antennae 
  thirteen-jointed, 
  terminal 
  joints 
  modified 
  into 
  

  

  a 
  hook. 
  

  

  54 
  (61) 
  Apex 
  of 
  clypeus 
  rather 
  deeply 
  or 
  very 
  deeply 
  emarginate, 
  in 
  

  

  the 
  first 
  case 
  yellow 
  or 
  yellow-spotted. 
  

  

  55 
  (56) 
  Mesothoracic 
  puncturation 
  nearly 
  or 
  entirely 
  effaced. 
  

  

  O. 
  sociabilis, 
  P. 
  

  

  56 
  (55) 
  Mesothoracic 
  punctures 
  always 
  distinct, 
  if 
  shallow. 
  

  

  57 
  (60) 
  Clypeus 
  extremely 
  deeply 
  emarginate, 
  the 
  emargination 
  not 
  

  

  less 
  than 
  a 
  semi-circle. 
  

  

  58 
  (59) 
  Mandibles 
  red. 
  O. 
  molokaiensis, 
  P. 
  

  

  59 
  (58) 
  Mandibles 
  dark. 
  O. 
  smithii, 
  D. 
  T. 
  

  

  60 
  (57) 
  Emargination 
  of 
  apex 
  of 
  clypeus 
  less 
  than 
  a 
  semi-circle 
  (head 
  

  

  above 
  the 
  antennae 
  with 
  somewhat 
  remote 
  puncturation). 
  

  

  O. 
  insnlicola, 
  Bl. 
  

  

  * 
  It 
  is 
  very 
  probable 
  that 
  O. 
  brevicostatus 
  and 
  possible 
  that 
  O. 
  eupteryx 
  

   belong 
  to 
  the 
  genus 
  Nesodynerus, 
  the 
  unique 
  types 
  of 
  these 
  species 
  in 
  the 
  

   British 
  Museum 
  not 
  having 
  been 
  examined 
  for 
  the 
  essential 
  generic 
  

   character. 
  

  

  