﻿390 
  Mr. 
  G. 
  J. 
  Arrow 
  on 
  Lamellicorn 
  Beetles. 
  

  

  XLVITI. 
  — 
  On 
  Lamellicorn 
  Beetles 
  belonging 
  to 
  the 
  Subfamilies 
  

   Ochodseinae, 
  Orplminae, 
  Hybosorinse, 
  and 
  Troginse. 
  By 
  

   Gilbert 
  J. 
  Arrow. 
  

  

  (Published 
  by 
  permission 
  of 
  the 
  Trustees 
  of 
  the 
  British 
  Museum.) 
  

   OcSOBMINJE. 
  

  

  The 
  genus 
  Ochodceus 
  is 
  evidently 
  destined 
  to 
  become 
  a 
  very 
  

   large 
  one, 
  especially 
  as 
  regards 
  its 
  American 
  representatives. 
  

   Nineteen 
  species 
  from 
  the 
  United 
  States 
  have 
  been 
  recently 
  

   enumerated 
  by 
  Mr. 
  Fall 
  (Journ. 
  New 
  York 
  Ent. 
  Soc. 
  xvii. 
  

   1009, 
  p. 
  30), 
  and 
  the 
  four 
  from 
  Central 
  America 
  and 
  three 
  

   from 
  South 
  America, 
  which 
  are 
  all 
  that 
  have 
  yet 
  been 
  

   described 
  from 
  that 
  huge 
  area, 
  certainly 
  give 
  a 
  wholly 
  in- 
  

   adequate 
  notion 
  of 
  those 
  actually 
  existing 
  there. 
  Owing 
  no 
  

   doubt 
  to 
  peculiarly 
  retiring 
  habits 
  possessed 
  by 
  these 
  beetles, 
  

   single 
  specimens 
  only 
  seem 
  to 
  be 
  generally 
  found, 
  and 
  those 
  

   rarely. 
  The 
  sexes 
  differ 
  in 
  the 
  most 
  distinctive 
  characters, 
  

   which 
  are 
  generally 
  those 
  of 
  the 
  male, 
  so 
  that 
  the 
  proper 
  

   association 
  of 
  male 
  and 
  female 
  is 
  difficult. 
  The 
  types 
  of 
  all 
  

   the 
  seven 
  species 
  mentioned 
  above 
  are 
  in 
  the 
  British 
  Mu- 
  

   seum, 
  and 
  as 
  the 
  discrimination 
  of 
  the 
  Central- 
  American 
  

   forms 
  in 
  the 
  'Biol. 
  Centr. 
  -Americana 
  ' 
  is 
  unsatisfactory, 
  I 
  

   have 
  thought 
  it 
  desirable 
  to 
  draw 
  up 
  a 
  table 
  of 
  the 
  species, 
  

   adding 
  a 
  few 
  new 
  ones, 
  by 
  which 
  the 
  total 
  is 
  raised 
  to 
  ten. 
  

  

  Synopsis 
  of 
  Central- 
  American 
  Species 
  of 
  Ochodasus. 
  

  

  1 
  (6). 
  Apical 
  angles 
  of 
  the 
  elytra 
  produced. 
  

  

  2 
  (5). 
  Pronotum 
  closely 
  granulated. 
  

  

  3 
  (4). 
  Vertex 
  of 
  the 
  head 
  bearing 
  a 
  transverse 
  

  

  carina 
  luridus, 
  Westw. 
  

  

  4 
  (3). 
  Vertex 
  of 
  the 
  head 
  without 
  a 
  transverse 
  

  

  carina 
  biarmatus, 
  Lee. 
  

  

  5 
  (2). 
  Pronotum 
  distinctly 
  punctured 
  puncticullis, 
  sp. 
  u. 
  

  

  6 
  (1). 
  Apical 
  angles 
  of 
  the 
  elytra 
  not 
  produced. 
  

  

  7 
  (10). 
  Head 
  without 
  tubercles. 
  

  

  8 
  (9). 
  Head 
  flat; 
  clypeus 
  not 
  very 
  small 
  planiceps, 
  sp. 
  n. 
  

  

  9 
  (8). 
  Clypeus 
  very 
  small, 
  with 
  the 
  margin 
  feebly 
  

  

  elevated 
  at 
  the 
  sides 
  and 
  middle 
  prcesidii, 
  Bates. 
  

  

  10 
  (7). 
  Head 
  tuberculate. 
  

  

  11 
  (18). 
  Clypeus 
  bituberculate. 
  

  

  12 
  (13). 
  Pronotum 
  distinctly 
  punctured 
  pollicaris, 
  Bates. 
  

  

  13 
  (12). 
  Pronotum 
  densely 
  granulated. 
  

  

  14 
  (15). 
  Elytra 
  clothed 
  with 
  close 
  decumbent 
  set* 
  . 
  hondurce, 
  sp. 
  n. 
  

  

  15 
  (14). 
  Elytra 
  clothed 
  with 
  erect 
  setae. 
  

  

  16 
  (17). 
  Vertex 
  bearing 
  a 
  slight 
  transverse 
  carina. 
  . 
  fraterculus, 
  sp. 
  n. 
  

  

  17 
  (10). 
  Vertex 
  without 
  a 
  transverse 
  carina 
  settdosus, 
  Bates. 
  

  

  18 
  (11). 
  Clypeus 
  unituberculate 
  euops, 
  sp. 
  n. 
  

  

  