﻿464 
  Dr. 
  D. 
  Sharp 
  on 
  

  

  Siagonium 
  Haroldi. 
  

  

  Siagonium 
  ffqroldi, 
  "Weise, 
  Deutsche 
  ent. 
  Zeitschr. 
  1879, 
  p. 
  148. 
  

  

  One 
  of 
  the 
  most 
  common 
  of 
  the 
  species 
  of 
  Staphylinidse 
  in 
  

   Japan. 
  The 
  length 
  of 
  the 
  mandibles 
  and 
  that 
  of 
  the 
  cephalic 
  

   horns 
  vary 
  extremely 
  ; 
  but 
  these 
  adornments 
  are 
  not 
  entirely 
  

   absent 
  in 
  any 
  of 
  the 
  numerous 
  examples 
  before 
  me. 
  

  

  Siagonium 
  debile, 
  n. 
  sp. 
  

  

  Angustuin, 
  subdepressuin, 
  nigrum, 
  minus 
  nitidurn 
  ; 
  antennis, 
  pedi- 
  

   bus 
  elytrisque 
  ex 
  parte 
  runs 
  ; 
  capite 
  tboraceque 
  crebrius 
  punc- 
  

   tatis, 
  hoc 
  transversim 
  triimpresso 
  ; 
  elytris 
  irregulariter 
  punctatis. 
  

  

  Long. 
  3 
  millim. 
  

  

  Closely 
  allied 
  in 
  structure 
  to 
  S. 
  nobile, 
  but 
  differing 
  as 
  

   follows 
  : 
  — 
  it 
  is 
  only 
  half 
  the 
  size, 
  and 
  the 
  antenna? 
  are 
  a 
  little 
  

   longer 
  and 
  more 
  slender 
  ; 
  the 
  head 
  and 
  thorax 
  are 
  much 
  more 
  

   densely 
  punctate, 
  the 
  thoracic 
  impressions 
  are 
  much 
  smaller, 
  

   and 
  the 
  elytra 
  are 
  more 
  uneven 
  and 
  more 
  numerously 
  punctate. 
  

  

  Miyanoshita, 
  Kiga, 
  and 
  Nagasaki 
  ; 
  five 
  examples. 
  

  

  Siagonium 
  gracile, 
  n. 
  sp. 
  

  

  Subdepressum, 
  dense 
  punctatum, 
  nigrum, 
  haud 
  nitidum 
  ; 
  antennis 
  

   pedibusque 
  fusco-rutis 
  ; 
  thorace 
  aequali 
  ; 
  elytris 
  seriatim 
  punctatis. 
  

   Long. 
  3-3| 
  millim. 
  

  

  Antenna?, 
  very 
  long 
  and 
  slender. 
  Head 
  broad, 
  abruptly 
  

   constricted 
  behind, 
  produced 
  in 
  front 
  to 
  form 
  two 
  acuminate 
  

   processes 
  ; 
  densely 
  and 
  evenly 
  punctate. 
  Thorax 
  transverse, 
  

   constricted 
  behind, 
  densely 
  punctate, 
  unimpressed. 
  Elytra 
  

   with 
  a 
  series 
  of 
  punctures 
  extending 
  to 
  the 
  extremity. 
  Legs 
  

   very 
  slender. 
  

  

  Nagasaki, 
  Kashiwagi, 
  Nara, 
  in 
  June 
  ; 
  Kurigahara, 
  in 
  

   August 
  ; 
  Miyanoshita, 
  in 
  December 
  ; 
  apparently 
  a 
  rare 
  

   insect. 
  

  

  The 
  nine 
  examples 
  of 
  this 
  species 
  secured 
  by 
  Mr. 
  Lewis 
  

   show 
  some 
  variation 
  in 
  sculpture, 
  but 
  are 
  no 
  doubt 
  all 
  one 
  

   species. 
  Though 
  allied 
  to 
  S. 
  nobile 
  and 
  S. 
  debile 
  in 
  struc- 
  

   ture, 
  it 
  can 
  be 
  distinguished 
  by 
  a 
  glance 
  at 
  the 
  sculpture 
  and 
  

   the 
  unimpressed 
  thorax. 
  

  

  PlESTONEUS, 
  nov. 
  gen. 
  

  

  Corpus 
  parallelum, 
  depressum. 
  Coxae 
  anteriores 
  omnino 
  depressa?. 
  

   Caput 
  muticum 
  ; 
  mandibular 
  parum 
  elongata?, 
  inoequales, 
  superne 
  

   dentatao. 
  Tibia? 
  anteriores 
  graciles, 
  apicem 
  versus 
  externe 
  brcvitcr 
  

   spinulosa?. 
  

  

  This 
  insect 
  may 
  be 
  placed 
  between 
  Piestus 
  and 
  Siagonium 
  ; 
  

  

  