﻿266 
  On 
  the 
  Staphylinidse 
  of 
  Japan. 
  

  

  Medon 
  discedens, 
  n. 
  sp. 
  

  

  Subdepressus, 
  elongatus, 
  picco-niger, 
  nitidus 
  ; 
  antennis 
  pedibusquo 
  

   rufls, 
  illis 
  graeilibus 
  ; 
  capite 
  thoraceque 
  irregulariter, 
  minus 
  dense, 
  

   fortiter 
  punctatis. 
  

  

  Long. 
  6-0^ 
  rnillirn. 
  

  

  Antennas 
  slender 
  and 
  elongate, 
  penultimate 
  joint 
  quite 
  as 
  

   long 
  as 
  broad. 
  Head 
  large, 
  shining, 
  black, 
  coarsely, 
  rather 
  

   sparingly 
  punctate, 
  more 
  sparingly 
  on 
  the 
  middle. 
  Thorax 
  

   strongly 
  transverse, 
  much 
  narrowed 
  behind, 
  coarsely 
  punc- 
  

   tate, 
  quite 
  shining. 
  Elytra 
  rather 
  longer 
  than 
  the 
  thorax, 
  

   with 
  a 
  close, 
  rough, 
  rather 
  coarse 
  sculpture. 
  Hind 
  body 
  

   moderately 
  closely 
  granulose 
  punctate. 
  Hind 
  tarsi 
  quite 
  

   slender, 
  basal 
  joint 
  twice 
  as 
  long 
  as 
  the 
  third. 
  

  

  This 
  is 
  another 
  peculiar, 
  very 
  distinct 
  species. 
  The 
  labrum 
  

   is 
  divided 
  in 
  the 
  middle 
  nearly 
  to 
  the 
  base 
  by 
  a 
  deep 
  angular 
  

   excision, 
  on 
  either 
  side 
  of 
  which 
  there 
  is 
  a 
  very 
  slight 
  pro- 
  

   jection 
  ; 
  the 
  front 
  tarsi 
  are 
  scarcely 
  dilated 
  ; 
  the 
  teeth 
  of 
  the 
  

   mandibles 
  are 
  large 
  and 
  there 
  is 
  on 
  either 
  side 
  one 
  less 
  than 
  

   normal 
  ; 
  the 
  left 
  mandible 
  is 
  only 
  bidentate, 
  but 
  the 
  large 
  basal 
  

   tooth 
  is 
  bidentate 
  at 
  the 
  extremity 
  ; 
  the 
  right 
  mandible 
  is 
  

   tridentate. 
  

  

  Kiga 
  and 
  Miyanoshita. 
  

  

  Medon 
  submaculatus, 
  n. 
  sp. 
  

  

  Testaceus 
  ; 
  capite 
  abdomineque 
  ferrugineis, 
  hoc 
  ante 
  apicem 
  fusco- 
  

  

  notato 
  ; 
  elytris 
  ad 
  latera 
  plus 
  rninusve 
  argute 
  nigro-maculatis. 
  

   Long. 
  4h 
  millim. 
  

  

  Head 
  not 
  large, 
  finely, 
  extremely 
  densely 
  punctate, 
  dull. 
  

   Thorax 
  transversely 
  subquadrate, 
  slightly 
  narrowed 
  behind, 
  

   densely, 
  rather 
  finely 
  rugose-punctate, 
  with 
  a 
  smooth 
  line 
  

   along 
  the 
  middle, 
  becoming 
  obsolete 
  in 
  front. 
  Elytra 
  densely 
  

   and 
  finely 
  punctate, 
  with 
  a 
  dark 
  mark, 
  frequently 
  obsolete, 
  

   on 
  the 
  middle 
  of 
  the 
  side 
  of 
  each. 
  Hind 
  body 
  very 
  finely 
  

   punctate, 
  the 
  antepenultimate 
  dorsal 
  plate 
  infuscate. 
  Front 
  

   tarsi 
  strongly 
  dilated 
  ; 
  hind 
  tarsi 
  quite 
  slender, 
  basal 
  joint 
  

   twice 
  as 
  long 
  as 
  the 
  second. 
  Male 
  with 
  a 
  broad 
  shallow 
  

   excision 
  on 
  the 
  hind 
  margin 
  of 
  the 
  last 
  ventral 
  plate. 
  

  

  This 
  is 
  another 
  peculiar 
  species 
  with 
  strongly 
  dilated 
  

   front 
  feet 
  and 
  unusually 
  small 
  teeth 
  on 
  the 
  mandibles. 
  

  

  Sandy 
  river-banks, 
  Niigata, 
  Kashiwagi, 
  Nagasaki. 
  

  

  Medon 
  prolix 
  us. 
  

   Lithocharis 
  p-olixa, 
  Sharp, 
  Trans. 
  Ent. 
  Soc. 
  Lond. 
  1874, 
  p. 
  G5. 
  

   The 
  nearest 
  ally 
  of 
  this 
  species 
  is 
  the 
  European 
  L. 
  mart- 
  

  

  