﻿502 
  REVISION 
  OF 
  THE 
  ELATERID.K 
  

  

  Plastocerus 
  J. 
  Schaum. 
  

   Frons 
  planiuscula, 
  antice 
  scnsim 
  deflexa, 
  non 
  marginata: 
  oculi 
  convexi 
  prominuli: 
  labrum 
  trans- 
  

   vcrsum 
  antice 
  rotundatum, 
  cum 
  fronte 
  arete 
  connatum: 
  mandibulffi 
  longiusculse, 
  minus 
  tenues, 
  vix 
  

   acuta?: 
  palpi 
  articulo 
  ultimo 
  vix 
  longiore 
  cylindrico: 
  antennae 
  pilosse, 
  flabellatse, 
  11-articulatae, 
  arti- 
  

   culo 
  1"'" 
  crassiore; 
  '2 
  — 
  10 
  gradatim 
  paulo 
  longioribus, 
  4 
  — 
  10 
  ramo 
  externo 
  cylindrico 
  valde 
  elongato 
  

   apicali 
  instructis; 
  ll 
  mu 
  ramo 
  prtecedentis 
  longiore, 
  cylindrico: 
  prosternum 
  antice 
  vix 
  rotundatum, 
  

   postice 
  longe 
  mucronatum: 
  coxa? 
  antics 
  parvae, 
  media 
  maiusculae 
  contigua?, 
  postica? 
  laminis 
  angustis 
  

   intus 
  paulo 
  latioribus 
  : 
  tarsi 
  longiusculi, 
  pubescentes, 
  articulis 
  1 
  — 
  4 
  sensim 
  brevioribus, 
  5'° 
  longiore 
  

   unguiculis 
  integris 
  : 
  tibia? 
  tenues 
  calcaribus 
  minutis: 
  abdomen 
  5-articulatum. 
  

  

  A 
  specimen 
  of 
  this 
  insect 
  was 
  sent 
  by 
  me 
  to 
  Dr. 
  Schaum, 
  who 
  pronounced 
  it 
  strictly 
  

   congeneric 
  with 
  Callirhipis 
  angulosus 
  Germ., 
  an 
  insect 
  found 
  in 
  Smyrna, 
  and 
  which 
  

   forms 
  in 
  the 
  Catalogus 
  Coleopterorum 
  Europe 
  the 
  type 
  of 
  the 
  unpublished 
  genus 
  Plas- 
  

   tocerus. 
  

  

  The 
  characters 
  are 
  very 
  distinct, 
  as 
  given 
  above; 
  the 
  general 
  form 
  of 
  the 
  body 
  is 
  that 
  

   of 
  Cebrio, 
  but 
  more 
  slender; 
  the 
  mandibles 
  are 
  shorter 
  and 
  less 
  acute 
  than 
  in 
  the 
  

   other 
  genera 
  of 
  this 
  group, 
  and 
  close 
  together 
  just 
  beyond 
  the 
  labrum, 
  so 
  as 
  to 
  leave 
  no 
  

   open 
  space 
  as 
  in 
  Aphricus 
  and 
  Cebrio; 
  the 
  labrum 
  is 
  closely 
  soldered 
  to 
  the 
  front, 
  as 
  in 
  

   Cebrio, 
  leaving 
  merely 
  a 
  transverse 
  line; 
  the 
  small 
  size 
  of 
  the 
  anterior 
  coxae 
  shows 
  the 
  

   persistence 
  of 
  the 
  Elater 
  type. 
  The 
  abdomen, 
  though 
  apparently 
  only 
  5-jointed, 
  is 
  

   slightly 
  dehiscent 
  at 
  the 
  apex, 
  permitting 
  the 
  sixth 
  internal 
  joint 
  to 
  be 
  seen. 
  

  

  1. 
  P. 
  Schaumii, 
  piceo-castaneus, 
  belvo-pubescens, 
  capite 
  thoraceque 
  pllis 
  longioribus 
  erectis 
  

   densius 
  vestitis, 
  illo 
  scabro, 
  hoc 
  antrorsum 
  angustato, 
  lateribus 
  sinuatis, 
  angulis 
  posticis 
  elongatis, 
  

   divergentibus, 
  dense 
  punctato, 
  elytris 
  striis 
  vage 
  impressis, 
  interstitiis 
  subrugosis, 
  pectore 
  longius 
  

   cinereo-pubescente. 
  Long. 
  "47. 
  

  

  San 
  Diego, 
  California, 
  May 
  and 
  June, 
  abundant, 
  flying 
  about 
  just 
  before 
  sunset, 
  and 
  

   alighting 
  on 
  bushes, 
  near 
  the 
  shore 
  of 
  the 
  bay. 
  In 
  the 
  male, 
  the 
  thorax 
  is 
  gradually 
  

   narrowed 
  from 
  the 
  base, 
  and 
  slightly 
  angulatcd 
  before 
  the 
  middle; 
  in 
  the 
  female, 
  the 
  sides 
  

   are 
  parallel 
  from 
  the 
  base 
  of 
  the 
  spines 
  to 
  the 
  middle, 
  then 
  rounded 
  to 
  the 
  apex. 
  This 
  

   insect 
  has 
  very 
  feebly 
  the 
  power 
  of 
  springing. 
  

  

  EUTHYSANIUS 
  Lee. 
  

  

  Frons 
  planiuscula, 
  antice 
  subito 
  devexa, 
  non 
  marginata: 
  oculi 
  convexi 
  prominuli: 
  labrum 
  breve, 
  

   antice 
  subsinuatum: 
  mandibular 
  modice 
  elongatae, 
  acuta?, 
  medio 
  dentata?: 
  palpi 
  articulo 
  ultimo 
  non 
  

   longiore, 
  cylindrico: 
  antenna? 
  pilosa? 
  flabellata?, 
  12-articulata?, 
  articulo 
  l 
  mo 
  crassiore, 
  sequentibus 
  duo- 
  

   bus 
  a?quali; 
  3'" 
  2 
  mI 
  ° 
  paulo 
  longiore; 
  4 
  — 
  11 
  sensim 
  paulo 
  longioribus, 
  ramo 
  externo 
  valde 
  elongato, 
  

   cylindrico 
  apicali 
  instructis, 
  12 
  mo 
  cylindrico, 
  ramo 
  pra?cedentis 
  sesqui 
  breviore: 
  prosternum 
  antice 
  vix 
  

   rotundatum, 
  sutura 
  laterali 
  obliqua 
  recta, 
  postice 
  mucronatum: 
  coxa? 
  antica? 
  parvae, 
  media? 
  fere 
  conti- 
  

   gua?, 
  postica? 
  laminis 
  angustis, 
  intus 
  latioribus: 
  tarsi 
  longiusculi 
  pubescentes, 
  articulis 
  1 
  — 
  4 
  sensim 
  

   brevioribus, 
  5 
  to 
  longiore, 
  unguiculis 
  integris: 
  tibia? 
  tenues, 
  calcaribus 
  parvis 
  : 
  abdomen 
  5-articulatum. 
  

  

  The 
  appearance 
  is 
  entirely 
  that 
  of 
  Plastocerus, 
  but 
  the 
  12-jointed 
  antennae, 
  and 
  the 
  

   more 
  prominent 
  and 
  acute 
  mandibles, 
  compel 
  me 
  to 
  separate 
  this 
  species. 
  The 
  labrum 
  is 
  

   more 
  porrected 
  than 
  in 
  the 
  preceding 
  genus, 
  and 
  is 
  nearly 
  horizontal, 
  not 
  following 
  the 
  

   convexity 
  of 
  the 
  anterior 
  part 
  of 
  the 
  front, 
  which 
  is 
  almost 
  perpendicular. 
  

  

  