﻿the 
  Staphylinidse 
  of 
  Japan. 
  465 
  

  

  it 
  is 
  distinguished 
  from 
  both 
  by 
  the 
  form 
  of 
  the 
  head 
  and 
  

   mandibles 
  and 
  is 
  different 
  from 
  Siagonium 
  in 
  the 
  apices 
  of 
  the 
  

   coxaj 
  not 
  being 
  exserted. 
  Head 
  without 
  horns 
  or 
  impres- 
  

   sions, 
  the 
  clypeus 
  large 
  but 
  defined 
  only 
  by 
  a 
  very 
  obsolete 
  

   suture, 
  and 
  presenting 
  a 
  sharp 
  edge 
  in 
  front 
  ; 
  labrum 
  not 
  

   visible. 
  Mandibles 
  strongly 
  curved, 
  rather 
  short, 
  the 
  left 
  

   with 
  a 
  large 
  tooth 
  on 
  the 
  inner 
  face 
  near 
  the 
  extremity, 
  and 
  

   on 
  the 
  upper 
  edge 
  with 
  a 
  longer 
  stout 
  process, 
  emarginate 
  at 
  

   the 
  apex 
  ; 
  right 
  mandible 
  rather 
  longer, 
  very 
  greatly 
  curved, 
  

   without 
  tooth 
  on 
  the 
  inner 
  face, 
  but 
  with 
  a 
  long, 
  incurved, 
  

   acuminate 
  process 
  on 
  the 
  upper 
  face. 
  Mentum 
  large, 
  nearly 
  

   semicircular. 
  Prosternum 
  large, 
  front 
  coxa} 
  not 
  at 
  all 
  promi- 
  

   nent. 
  Mesosternum 
  large, 
  pentagonal 
  ; 
  middle 
  coxse 
  flat, 
  

   separated 
  by 
  a 
  very 
  slender 
  process 
  of 
  the 
  mesosteriuun. 
  

   Tibiae 
  slender, 
  the 
  anterior 
  with 
  a 
  few 
  short 
  spinules 
  on 
  the 
  

   outer 
  edge 
  at 
  the 
  extremity. 
  Tarsi 
  very 
  slender, 
  terminal 
  

   joint 
  as 
  long 
  as 
  the 
  four 
  preceding 
  together. 
  

  

  This 
  interesting 
  new 
  genus 
  of 
  Piestiua 
  differs 
  from 
  Sia- 
  

   gonium 
  by 
  the 
  unexserted 
  front 
  coxae 
  and 
  the 
  very 
  peculiar 
  

   form 
  of 
  the 
  mandibles 
  ; 
  this 
  latter 
  character 
  in 
  some 
  degree 
  

   recalls 
  the 
  structure 
  of 
  Leptochirus. 
  

  

  Piestoneus 
  Lewisii, 
  n. 
  sp. 
  

  

  Depressus, 
  elongatus, 
  parallelus, 
  niger 
  : 
  antennis, 
  pedibas 
  elytro- 
  

   rumque 
  plaga 
  elongata 
  rufis 
  ; 
  capite 
  mutieo, 
  mandibulis 
  brevibus, 
  

   singulis 
  medio 
  superne 
  dente 
  erecto 
  introrsum 
  curvato 
  armatis. 
  

  

  Long. 
  5-9 
  millim. 
  

  

  Antennae 
  rather 
  stout, 
  elongate, 
  more 
  or 
  less 
  hairy. 
  Head 
  

   large, 
  subquaclrate, 
  nearly 
  flat, 
  sparingly 
  punctate. 
  Thorax 
  

   strongly 
  transverse, 
  slightly 
  narrowed 
  behind, 
  sparingly 
  punc- 
  

   tate. 
  Elytra 
  much 
  longer 
  than 
  the 
  thorax, 
  with 
  rather 
  irre- 
  

   gular 
  series 
  of 
  punctures 
  not 
  reaching 
  to 
  the 
  extremity. 
  

  

  This 
  species 
  is 
  common 
  under 
  bark 
  of 
  trees 
  in 
  the 
  moist 
  

   forests 
  ; 
  it 
  varies 
  much 
  in 
  size, 
  but 
  I 
  do 
  not 
  observe 
  any 
  

   sexual 
  distinctions, 
  though 
  it 
  is 
  probable 
  that 
  the 
  smaller 
  

   specimens, 
  in 
  which 
  the 
  antennae 
  are 
  shorter 
  and 
  less 
  hairy, 
  

   are 
  of 
  the 
  female 
  sex. 
  

  

  Thoracophorus 
  certatus, 
  n. 
  sp. 
  

  

  Subcylindricus, 
  rufus, 
  opacus, 
  longitudinaliter 
  sculpturatus 
  ; 
  thorace 
  

  

  elongato, 
  angulis 
  anterioribus 
  lateraliter 
  subprominulis. 
  

   Long. 
  3 
  millim. 
  

  

  Antennae 
  short, 
  eighth 
  to 
  tenth 
  joints 
  transverse. 
  Head 
  

   with 
  the 
  hind 
  angles 
  well 
  marked, 
  eyes 
  not 
  visible 
  from 
  

  

  