﻿Coleopterous 
  Genera 
  Hydrochus 
  and 
  Ochthehius. 
  23 
  1 
  

  

  3. 
  Ochthehius 
  margipallens, 
  Latreille 
  and 
  Mulsant. 
  

  

  •pusillus, 
  Waterhouse, 
  Stephens. 
  

  

  4. 
  Ochthebius 
  jyrjgmceus, 
  of 
  Stephens 
  and 
  Continental 
  authors. 
  

  

  5. 
  Ochthebius 
  bicohm, 
  Stephens 
  and 
  Continental 
  authors. 
  

  

  6. 
  Ochthehius 
  rufo-marginatus, 
  Stephens. 
  

  

  This 
  I 
  regard 
  as 
  a 
  good 
  species. 
  Mulsant 
  gives 
  nifimarginatus 
  

   as 
  a 
  synonym 
  with 
  0. 
  bicolon, 
  but 
  I 
  suspect 
  he 
  is 
  not 
  acquainted 
  

   with 
  our 
  species, 
  and 
  has 
  supposed 
  certain 
  varieties 
  of 
  0. 
  bicolon, 
  

   in 
  which 
  the 
  sides 
  of 
  the 
  thorax 
  are 
  reddish, 
  to 
  be 
  Mr. 
  Stephens's 
  

   species. 
  The 
  present 
  species 
  is 
  shorter, 
  more 
  convex, 
  and 
  has 
  

   the 
  elytra 
  more 
  deeply 
  punctate-striated 
  than 
  0. 
  bicolon. 
  

  

  7. 
  Ochthebius 
  exaratus, 
  Mulsant. 
  

  

  8. 
  Ochthehius 
  ceratus, 
  Stephens. 
  

  

  nanus, 
  Stephens. 
  

  

  pellucidus, 
  Mulsant. 
  

   Stephens's 
  0. 
  nanus 
  appears 
  to 
  me 
  to 
  be 
  clearly 
  a 
  small 
  black 
  

   variety 
  of 
  his 
  O. 
  ceratus, 
  which 
  is 
  undoubtedly 
  the 
  same 
  as 
  Mulsant's 
  

   0. 
  pellucidus. 
  I 
  may 
  further 
  remark 
  that 
  the 
  O. 
  hibernicus 
  of 
  

   Stephens's 
  Collection 
  is 
  the 
  same, 
  but 
  the 
  0. 
  hibernicus 
  of 
  Curtis 
  

   appears 
  to 
  be 
  the 
  next 
  species. 
  

  

  9. 
  Ochthehius 
  punetatus, 
  Stephens 
  and 
  Continental 
  authors. 
  

  

  hibernicus, 
  Curtis. 
  

  

  10. 
  Ochthehius 
  exculptus, 
  Sturm. 
  

   Enicocerus 
  viridiceneus, 
  Steph. 
  {$). 
  

  

  Gibsoni, 
  Curtis 
  ( 
  $ 
  ). 
  

   tristis, 
  Curtis. 
  

  

  