﻿418 
  On 
  the 
  Staphylinidse 
  of 
  Japan. 
  

  

  Group 
  Phlceocharina. 
  

  

  Derops. 
  

  

  Corpus 
  angustulum, 
  minus 
  depressum, 
  dense 
  subtiliter 
  punctulatum. 
  

   Palpi 
  maxillares 
  articulo 
  terminali 
  prsecedente 
  fere 
  duplo 
  lon- 
  

   giore. 
  Tarsi 
  omnes 
  quinque-articulati, 
  posteriores 
  articulo 
  basali 
  

   cseteris 
  conjunctis 
  fere 
  asquali 
  ; 
  unguiculi 
  minuti. 
  

  

  This 
  is 
  tlie 
  most 
  remarkable 
  and 
  peculiar 
  of 
  all 
  the 
  Staphy- 
  

   linidse 
  of 
  Japan, 
  and 
  I 
  do 
  not 
  know 
  any 
  genus 
  at 
  all 
  near 
  it. 
  

   The 
  front 
  coxte 
  are 
  elongate 
  and 
  exserted 
  and 
  the 
  sides 
  of 
  

   the 
  thorax 
  possess 
  a 
  large 
  triangular 
  process 
  behind 
  the 
  coxas 
  ; 
  

   a 
  rather 
  large 
  fissure 
  is 
  left 
  between 
  this 
  and 
  the 
  prosternum 
  

   in 
  which 
  a 
  trochanter 
  is 
  seen. 
  The 
  antennae 
  are 
  eleven- 
  

   jointed, 
  slender 
  and 
  remarkably 
  long. 
  The 
  mandibles 
  are 
  

   slender, 
  curved, 
  apparently 
  without 
  teeth, 
  not 
  crossing 
  one 
  

   another 
  ; 
  the 
  labrum 
  appears 
  to 
  be 
  large 
  and 
  prominent 
  but 
  

   membranous 
  ; 
  the 
  maxillary 
  palpi 
  are 
  apparently 
  only 
  three- 
  

   jointed, 
  the 
  third 
  joint 
  being 
  longer 
  than 
  the 
  basal 
  joint 
  and 
  

   nearly 
  twice 
  as 
  long 
  as 
  the 
  middle 
  joint. 
  The 
  middle 
  coxae 
  

   are 
  contiguous 
  and 
  rather 
  large 
  ; 
  the 
  hind 
  coxa? 
  are 
  prolonged 
  

   backwards, 
  but 
  are 
  short 
  transversely. 
  The 
  legs 
  are 
  long, 
  

   unarmed, 
  the 
  long 
  tibia} 
  are 
  more 
  than 
  twice 
  as 
  long 
  as 
  the 
  

   tarsi 
  5 
  the 
  hind 
  tarsi 
  are 
  remarkably 
  slender 
  and 
  linear. 
  The 
  

   antennas 
  are 
  widely 
  separated, 
  are 
  situated 
  very 
  near 
  the 
  

   front 
  of 
  the 
  head, 
  and 
  have 
  no 
  tubercles 
  over 
  their 
  point 
  of 
  

   insertion. 
  

  

  I 
  can 
  see 
  no 
  trace 
  of 
  ocelli, 
  so 
  that 
  the 
  insect 
  cannot 
  be 
  

   placed 
  in 
  Omaliides 
  ; 
  had 
  those 
  organs 
  been 
  present 
  the 
  genus 
  

   might 
  have 
  been 
  placed 
  satisfactorily 
  near 
  to 
  Lesteva. 
  

  

  Derops 
  longicornis, 
  n. 
  sp. 
  

  

  Elongatus, 
  angustulus, 
  posterius 
  attenuatus, 
  fusco-piceus, 
  fere 
  

   opacus, 
  dense 
  subtilissime 
  pubescens 
  : 
  antennarum 
  basi, 
  palpis 
  

   pedibusque 
  rufo-testaceis 
  ; 
  protborace 
  cordato 
  ; 
  elytris 
  elongatis. 
  

  

  Long. 
  corp. 
  5 
  millim., 
  antenu. 
  fere 
  3 
  millim. 
  

  

  Antennae 
  long 
  and 
  slender, 
  scarcely 
  thicker 
  externally 
  ; 
  

   from 
  the 
  seventh 
  to 
  the 
  tenth 
  each 
  joint 
  is 
  rather 
  shorter 
  than 
  

   its 
  predecessor, 
  and 
  the 
  terminal 
  joint 
  is 
  not 
  so 
  long 
  as 
  the 
  

   seventh. 
  Head 
  much 
  narrower 
  than 
  the 
  thorax, 
  flat, 
  very 
  

   densely 
  and 
  finely 
  punctate. 
  Thorax 
  elongate, 
  sides 
  rounded 
  

   in 
  front, 
  much 
  narrowed 
  behind, 
  hind 
  angles 
  definite, 
  rather 
  

   obtuse, 
  the 
  surface 
  evenly, 
  densely, 
  and 
  finely 
  punctate, 
  

   basal 
  and 
  lateral 
  margins 
  very 
  fine. 
  Elytra 
  much 
  longer 
  

   than 
  the 
  thorax, 
  densely 
  (and 
  rather 
  more 
  coarsely 
  than 
  the 
  

  

  