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  5 
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  14 
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  15 
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  16 
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  (iii) 
  SYNOPSIS 
  OF 
  KAUAI 
  ODYHERUS. 
  

  

  Dorsal 
  and 
  posterior 
  faces 
  of 
  the 
  post-scutellum 
  separated 
  by 
  a 
  

   fine 
  spinulcse 
  or 
  serrulate 
  ridge 
  or 
  raised 
  line. 
  

  

  Abdomen 
  entirely 
  black, 
  or 
  very 
  rarely 
  with 
  the 
  apical 
  margin 
  

   of 
  the 
  basal 
  segment 
  yellow. 
  Odynerus 
  nigripennis. 
  

  

  Abdomen 
  with 
  two 
  distinct 
  yellow 
  or 
  whitish 
  bands. 
  

  

  Basal 
  abdominal 
  segment 
  completely 
  rounded 
  off 
  at 
  the 
  meeting 
  

   of 
  its 
  dorsal 
  and 
  anterior 
  surfaces. 
  O. 
  radula. 
  

  

  Basal 
  abdominal 
  segment 
  slightly 
  depressed 
  on 
  its 
  dorsal 
  sur- 
  

   face, 
  so 
  that 
  this 
  forms 
  with 
  the 
  anterior 
  surface 
  a 
  rather 
  

   distinct 
  edge, 
  where 
  they 
  meet. 
  O. 
  localis. 
  

  

  Dorsal 
  and 
  posterior 
  faces 
  of 
  the 
  post-scutellum 
  not 
  separated 
  

   by 
  a 
  distinct 
  raised 
  line 
  

  

  Thorax 
  and 
  abdomen 
  with 
  red 
  markings. 
  

  

  Pronotum 
  with 
  a 
  fine 
  transverse 
  red 
  line, 
  entire 
  or 
  broken. 
  

  

  O. 
  soror. 
  

  

  Pronotum 
  without 
  a 
  red 
  line. 
  O. 
  blackburni. 
  

  

  Thorax 
  and 
  abdomen 
  without 
  red 
  markings. 
  

  

  Abdomen 
  with 
  the 
  bands 
  orange 
  or 
  deep 
  yellow. 
  

  

  O. 
  xanthorhoes. 
  

  

  Abdomen 
  with 
  pale 
  j^ellow 
  or 
  whitish 
  bands. 
  

  

  Second 
  ventral 
  segment 
  very 
  strongly 
  and 
  abruptly 
  raised 
  

   behind 
  the 
  sulcature, 
  to 
  a 
  height 
  much 
  exceeding 
  that 
  of 
  

   the 
  basal 
  part 
  of 
  the 
  segment 
  (the 
  costae 
  more 
  or 
  less 
  

   obliterated, 
  and 
  no 
  depression 
  behind 
  the 
  sulcature). 
  

  

  O. 
  mimus. 
  

  

  Second 
  ventral 
  segment 
  not 
  so 
  raised 
  (only 
  in 
  a 
  few 
  species 
  

   attaining 
  a 
  height 
  about 
  equal 
  to 
  that 
  of 
  its 
  basal 
  portion). 
  

  

  Costae 
  very 
  short, 
  shorter 
  than 
  the 
  tumid 
  basal 
  portion 
  of 
  the 
  

   segment; 
  or 
  nearlj'' 
  or 
  quite 
  obsolete, 
  the 
  sulcature 
  being 
  

   smooth; 
  the 
  depression 
  absent 
  or 
  very 
  faint 
  and 
  linear. 
  

  

  Sulcature 
  mostly 
  smooth, 
  the 
  costae 
  nearly 
  absent, 
  generally 
  

   visible 
  as 
  traces 
  only 
  along 
  the 
  basal 
  margin 
  of 
  the 
  sulcature. 
  

  

  O. 
  nesiotes. 
  

  

  Costae 
  short, 
  but 
  strong; 
  basal 
  part 
  of 
  segment 
  large 
  and 
  tumid. 
  

  

  O. 
  vittativentris. 
  

  

  Costae 
  of 
  second 
  ventral 
  segment 
  not 
  very 
  short, 
  the 
  middle 
  

   ones 
  generally 
  long 
  and 
  not 
  shorter 
  than 
  the 
  basal 
  portion 
  

   of 
  the 
  segment, 
  or 
  with 
  a 
  distinct 
  large 
  or 
  largish 
  depression 
  

   behind 
  the 
  costae. 
  

  

  Second 
  ventral 
  segment 
  flat 
  behind 
  the 
  costae, 
  no 
  distinct 
  

   depression. 
  

  

  Second 
  dorsal 
  segment 
  very 
  abruptly 
  and 
  strongly 
  raised 
  from. 
  

   the 
  base 
  into 
  a 
  conical 
  tuberculate 
  form 
  (middle 
  tibiae 
  

   without 
  a 
  calcar). 
  Xesodynerus 
  conifer. 
  

  

  Second 
  dorsal 
  segment 
  not 
  so 
  raised. 
  

  

  