﻿OF 
  THE 
  UNITED 
  STATES. 
  421 
  

  

  The 
  strong 
  points 
  of 
  resemblance 
  arc 
  as 
  follows: 
  

  

  The 
  antennce 
  are 
  closely 
  approximated, 
  inserted 
  in 
  a 
  deep 
  sinus; 
  the 
  labrum 
  is 
  indis- 
  

   tinct, 
  being 
  connate 
  with 
  the 
  clypeus, 
  which 
  is 
  dilated 
  in 
  front 
  of 
  the 
  antennae: 
  the 
  first 
  

   joint 
  of 
  the 
  antenna? 
  is 
  elongate; 
  the 
  anterior 
  coxa? 
  are 
  more 
  widely 
  separated 
  than 
  in 
  the 
  

   true 
  Elaterido?, 
  and 
  the 
  posterior 
  spine 
  is 
  short; 
  the 
  last 
  joint 
  of 
  the 
  palpi 
  is 
  very 
  large 
  

   and 
  triangular; 
  the 
  tarsi 
  are 
  short, 
  and 
  the 
  claws 
  .pectinate. 
  

  

  Cerophytum 
  Lair. 
  

  

  1. 
  C. 
  pulsator, 
  ater, 
  opacus, 
  capite 
  thoraceque 
  fuseo-pubescentibus, 
  hoc 
  convexo, 
  latitudine 
  fere 
  

   sesqui 
  breviore, 
  latcribus 
  antice 
  valde 
  rotundatis, 
  confertim 
  punctate-, 
  angulis 
  posticis 
  minutis 
  promi- 
  

   nulis, 
  elytris 
  striis 
  punctatis, 
  interstitiis 
  planis 
  scabro-punctatis. 
  Long. 
  --1 
  — 
  - 
  3J. 
  

  

  Hakleman, 
  Proc. 
  Acad. 
  Nat. 
  Sc. 
  3, 
  348; 
  LeConte, 
  ibid. 
  6, 
  230. 
  

  

  Chorea 
  pulsator 
  Hakleman, 
  Proc. 
  Acad. 
  Nat. 
  Sc. 
  3, 
  150. 
  

  

  Pennsylvania; 
  Ohio. 
  The 
  female 
  was 
  given 
  m£ 
  by 
  Mr. 
  Haldeman, 
  the 
  male 
  by 
  Dr. 
  

   Schaum. 
  The 
  latter 
  is 
  more 
  slender 
  than 
  the 
  female; 
  the 
  third 
  to 
  the 
  tenth 
  joints 
  of 
  the 
  

   antenna? 
  are 
  furnished 
  with 
  a 
  stout 
  branch 
  near 
  the 
  base, 
  externally; 
  the 
  last 
  joint 
  is 
  longer, 
  

   and 
  is 
  thickened 
  somewhat 
  towards, 
  the 
  tip, 
  as 
  if 
  composed 
  of 
  two 
  joints 
  agglutinated 
  to- 
  

   gether. 
  

  

  Perothops 
  Esch. 
  EricJison. 
  

  

  1. 
  P. 
  mucidus, 
  piceo-niger, 
  tenuiter 
  cinereo-pirbescens, 
  tborace 
  convexo, 
  latitudine 
  breviore 
  an- 
  

   trorsuni 
  valde 
  angustato, 
  lateribus 
  rotundato 
  ; 
  angulis 
  posticis 
  brevibus 
  subdivergentibus, 
  subtilissirne 
  

   punctulato, 
  punctis 
  paucis 
  minutis 
  consperso, 
  eljtris 
  tenuiter 
  striatis, 
  interstitiis 
  paulo 
  convexis, 
  alu- 
  

   taceis, 
  parce 
  subtiliter 
  punctatis, 
  ore 
  barbato. 
  Long. 
  -55 
  — 
  '(J. 
  

  

  Erichson, 
  Germ. 
  Zeitschr. 
  3, 
  117. 
  

  

  Elater 
  mucidus 
  Schonh., 
  Syn. 
  Ins. 
  Supp. 
  133; 
  (muscidus) 
  Say, 
  Ann. 
  Lye. 
  1, 
  256. 
  

  

  Eucnemis 
  muscidus 
  Say, 
  Trans. 
  Am. 
  Phil. 
  Soc. 
  6, 
  186. 
  

  

  Elater 
  unicolor 
  Say, 
  Ann. 
  Lye. 
  1, 
  256. 
  

  

  Eucnemis 
  unicolor 
  Say, 
  Trans. 
  Am. 
  Phil. 
  Soc. 
  6, 
  186. 
  

  

  Middle 
  and 
  Southern 
  States. 
  E. 
  muscidus 
  Say 
  is 
  a 
  brown, 
  not 
  fully 
  coloured 
  variety. 
  

  

  Div. 
  4. 
  ELATERIDES, 
  (genuini.) 
  

   The 
  genera 
  of 
  this 
  division 
  are 
  very 
  numerous, 
  and 
  seem 
  to 
  have 
  been 
  very 
  unneces- 
  

   sarily 
  multiplied 
  on 
  slight 
  grounds. 
  They 
  are 
  all 
  characterized 
  by 
  having 
  the 
  mandibles 
  

   small 
  and 
  retracted, 
  and 
  the 
  antenna? 
  widely 
  separated, 
  inserted 
  very 
  near 
  the 
  eyes 
  in 
  deep 
  

   fovea;: 
  the 
  clypeus 
  is 
  never 
  dilated 
  anteriorly, 
  and 
  the 
  labrum 
  is 
  always 
  distinct. 
  The 
  fol- 
  

   lowing 
  table 
  expresses 
  the 
  relations 
  of 
  the 
  genera 
  found 
  in 
  this 
  country, 
  in 
  a 
  tolerably 
  na- 
  

   tural 
  manner, 
  though 
  the 
  necessity 
  of 
  introducing 
  several 
  new 
  genera, 
  mostly 
  for 
  single 
  

   anomalous 
  species, 
  is 
  very 
  much 
  to 
  be 
  regretted. 
  

  

  1. 
  Tarsi 
  subxquaUtcr 
  pubesccntes, 
  sccpe 
  lobati 
  ; 
  mesosternum 
  /ion 
  protuberans; 
  prostcrmnn 
  

   semper 
  mucroiiatum; 
  antenna- 
  non 
  receptee. 
  

  

  A. 
  Prosternum 
  semper 
  mucronatum, 
  lateribus 
  rectis: 
  irons 
  praecipue 
  concava, 
  vol 
  plana, 
  fossulis 
  

   antennarum 
  male 
  definitis 
  : 
  coxse 
  posticoe 
  laminis 
  angustis, 
  intus 
  paulo 
  dilatatis, 
  vix 
  dentatis 
  : 
  anten- 
  

   na; 
  articulo 
  l 
  mo 
  mediocri; 
  ungues 
  simplices. 
  

  

  