﻿332 
  Dr. 
  D. 
  Sharp 
  on 
  

  

  without 
  grooves. 
  Thorax 
  rather 
  longer 
  than 
  broad. 
  Elytra 
  

   longer 
  and 
  much 
  broader 
  than 
  the 
  thorax, 
  rather 
  con- 
  

   vex, 
  coarsely 
  and 
  extremely 
  densely 
  punctured. 
  Hind 
  body 
  

   elongate- 
  conic, 
  extremely 
  densely 
  punctured, 
  the 
  sculpture 
  

   uniform, 
  as 
  coarse 
  on 
  the 
  apical 
  as 
  on 
  the 
  basal 
  segments. 
  

   Legs 
  yellowish, 
  apex 
  of 
  femora 
  and 
  base 
  of 
  tibia? 
  fuscescent. 
  

   Male 
  with 
  a 
  broad 
  slight 
  emargination 
  of 
  the 
  last 
  ventral 
  

   plate 
  and 
  with 
  the 
  preceding 
  segment 
  deplanate 
  along 
  the 
  

   middle. 
  

  

  Sanjo, 
  3rd 
  September, 
  1881 
  ; 
  two 
  examples. 
  

  

  This 
  is 
  like 
  S. 
  dissimilis^ 
  but 
  is 
  quite 
  distinct 
  on 
  account 
  

   of 
  the 
  longer 
  elytra 
  and 
  the 
  denser 
  punctuation. 
  

  

  Stenus 
  dissimilis. 
  

   Stenus 
  dissimilis, 
  Sharp, 
  Trans. 
  Ent. 
  Soc. 
  Lond. 
  1874, 
  p. 
  87. 
  

   Nagasaki 
  in 
  March 
  and 
  April 
  ; 
  rare. 
  

  

  Stenus 
  concinnus, 
  n. 
  sp. 
  (Sect. 
  II. 
  B, 
  Erichson.) 
  

  

  Angustus, 
  sat 
  elongatus, 
  niger, 
  sat 
  nitidus, 
  parce 
  brevissime 
  albido- 
  

   pubescens, 
  crebre 
  fortiter 
  punctatus 
  ; 
  antennarum 
  basi, 
  palpis 
  

   pedibusque 
  testaccis, 
  femorum 
  apicibus, 
  tarsis 
  palporumque 
  

   artieulo 
  ultimo 
  fuscescentibus. 
  

  

  Long. 
  3| 
  millim. 
  

  

  Antennas 
  rather 
  short 
  and 
  slender, 
  base 
  .clear 
  yellow. 
  

   Head 
  flat, 
  densely 
  and 
  evenly 
  punctured. 
  Thorax 
  rather 
  

   longer 
  than 
  broad, 
  subcylindric, 
  only 
  slightly 
  curved 
  at 
  the 
  

   sides, 
  very 
  densely 
  punctured. 
  Elytra 
  slender, 
  longer 
  than 
  

   the 
  thorax, 
  densely 
  punctured. 
  Hind 
  body 
  slender, 
  the 
  basal 
  

   segment 
  densely 
  and 
  coarsely, 
  the 
  apical 
  sparingly 
  and 
  finely 
  

   punctate. 
  

  

  Niigata, 
  15th 
  September, 
  1881 
  ; 
  one 
  example. 
  

  

  This 
  is 
  most 
  like 
  8. 
  confertus, 
  but 
  is 
  very 
  easily 
  distin- 
  

   guished 
  by 
  the 
  shining 
  surface 
  ; 
  it 
  has 
  a 
  more 
  cylindrical 
  

   thorax 
  and 
  is, 
  judging 
  from 
  one 
  example, 
  a 
  more 
  slender 
  

   insect. 
  

  

  Stenus 
  oblitus. 
  

   Stenus 
  oblitus, 
  Sharp, 
  Trans. 
  Ent. 
  Soc. 
  Lond. 
  1874, 
  p. 
  87. 
  

  

  Found 
  sparingly 
  in 
  September 
  and 
  October 
  ; 
  Honjo, 
  Furu- 
  

   kawa, 
  Niigata. 
  

  

  The 
  male 
  characters 
  in 
  this 
  species 
  are 
  very 
  slight 
  and 
  

   consist 
  merely 
  of 
  a 
  slight 
  emargination 
  of 
  the 
  hind 
  margin 
  of 
  

   the 
  last 
  ventral 
  plate. 
  

  

  