﻿68 
  

  

  Clypeus 
  generally 
  more 
  or 
  less 
  impressed 
  at 
  the 
  apex 
  but 
  the 
  

  

  true 
  emargination 
  not 
  deep. 
  

   Mandibles 
  for 
  the 
  most 
  part 
  red; 
  propodeum 
  with 
  dull 
  surface 
  

  

  and 
  hardly 
  visible 
  sculpture. 
  O. 
  aprepes, 
  sp. 
  nov. 
  

  

  Mandibles 
  generally 
  for 
  the 
  most 
  part 
  black; 
  propodeum 
  with 
  

  

  some 
  coarse 
  shallow 
  punctures 
  or 
  rugose. 
  

   Head 
  above 
  the 
  antennae 
  densely, 
  mesothorax 
  strongly 
  and 
  

  

  closely, 
  punctured. 
  

   Second 
  ventral 
  segment 
  of 
  abdomen 
  with 
  no 
  depression 
  behind 
  

  

  the 
  costae 
  or 
  with 
  only 
  faint 
  traces 
  of 
  one. 
  O. 
  lanaiensis, 
  P. 
  

   Second 
  ventral 
  segment 
  with 
  a 
  shallow 
  but 
  distinct 
  depression 
  

  

  (second 
  dorsal 
  segment 
  quite 
  strongly 
  subtuberculately 
  

  

  raised 
  from 
  the 
  base). 
  O. 
  konanus., 
  P 
  

  

  Head 
  above 
  the 
  antennae 
  more 
  or 
  less 
  remotely 
  or 
  sparsely 
  

  

  punctured, 
  mesothorax 
  not 
  strongly 
  punctured. 
  

   Clypeus 
  wide, 
  seen 
  from 
  in 
  front 
  not 
  mvich 
  produced; 
  face 
  with 
  

  

  a 
  median 
  yellow 
  spot. 
  Pseudopterocheilus 
  congruus, 
  Sm. 
  

   Clypeus 
  long 
  and 
  narrow 
  much 
  produced; 
  no 
  yellow 
  frontal 
  

  

  spot. 
  Chelodynerus 
  chelifer, 
  P. 
  

  

  Females; 
  antennae 
  twelve-jointed, 
  simple 
  at 
  the 
  apex. 
  

   Mandibles 
  extremely 
  long 
  and 
  narrow 
  with 
  the 
  teeth 
  more 
  or 
  

  

  less 
  obsolete; 
  a 
  distinct 
  and 
  rather 
  long 
  cheek 
  between 
  the 
  

  

  eye 
  and 
  mandibles. 
  C. 
  chelifer, 
  P. 
  

  

  Mandibles 
  normal; 
  no 
  distinct 
  cheeks. 
  

   Maxillary 
  palpi 
  extremely 
  long 
  and 
  regularly 
  fringed 
  with 
  long 
  

  

  hairs. 
  P- 
  congrmis, 
  Sm. 
  

  

  ]\Iaxillary 
  palpi 
  normal. 
  

   Mesothorax 
  with 
  fine 
  sparse 
  punctures, 
  sometimes 
  almost 
  

  

  effaced, 
  the 
  surface 
  very 
  dull 
  with 
  extremely 
  dense 
  minute 
  

  

  interstitial 
  punctures 
  very 
  distinct. 
  O. 
  sociabilis, 
  P. 
  

  

  76 
  (75) 
  Mesothorax 
  always 
  distinctly, 
  sometimes 
  strongly 
  or 
  densely 
  

  

  punctured, 
  the 
  surface 
  between 
  the 
  punctures 
  in 
  some 
  

   species 
  more 
  or 
  less 
  shining, 
  the 
  minute 
  interstitial 
  punc- 
  

   tures 
  in 
  some 
  indistinct 
  or 
  nearly 
  effaced. 
  

  

  77 
  (78) 
  Mandibles 
  nearly 
  entirely 
  red. 
  O. 
  molokaiensis, 
  P. 
  

  

  78 
  (77) 
  Mandibles 
  wholly 
  or 
  for 
  the 
  most 
  part 
  black. 
  

  

  79 
  (84) 
  Mesothorax 
  closely 
  and 
  often 
  strongly 
  punctured. 
  

  

  80 
  (83) 
  Apex 
  of 
  clypeus 
  truncate 
  or 
  very 
  slightly 
  emarginate, 
  basal 
  

  

  abdominal 
  segments 
  not 
  pale 
  along 
  the 
  apical 
  margins. 
  

  

  81 
  (82) 
  Depression 
  of 
  second 
  ventral 
  segment 
  of 
  abdomen 
  shallow 
  but 
  

  

  quite 
  distinct. 
  O. 
  konanus, 
  P. 
  

  

  82 
  (81) 
  Depression 
  of 
  second 
  ventral 
  segment 
  scarcely 
  or 
  not 
  at 
  all 
  

  

  perceptible. 
  O. 
  lanaiensis, 
  P. 
  

  

  83 
  (80) 
  Apex 
  of 
  clypeus 
  very 
  distinctly 
  emarginate, 
  the 
  true 
  emargina- 
  

  

  tion 
  not 
  very 
  feeble; 
  abdomen 
  generally 
  with 
  the 
  apical 
  

   margin 
  of 
  the 
  basal 
  or 
  two 
  basal 
  abdominal 
  segments 
  pale. 
  

  

  O. 
  smithii, 
  D. 
  T. 
  

  

  84 
  (79) 
  Mesothorax 
  somewhat 
  remotely 
  and 
  not 
  strongly 
  punctured. 
  

  

  O. 
  insulicola, 
  Bl. 
  

  

  