﻿452 
  REVISION 
  OF 
  THE 
  ELATERIDJE 
  

  

  relations 
  arc 
  not 
  known 
  in 
  all 
  the 
  species. 
  I 
  have 
  endeavoured 
  to 
  point 
  out 
  such 
  dis- 
  

   tinctive 
  characters 
  as 
  appear 
  to 
  be 
  independent 
  of 
  sex, 
  but 
  am 
  very 
  doubtful 
  about 
  the 
  

   correctness 
  of 
  the 
  results; 
  although 
  the 
  differences 
  of 
  the 
  posterior 
  thoracic 
  angles, 
  the 
  

   striae 
  of 
  the 
  elytra, 
  and 
  the 
  constriction 
  of 
  the 
  last 
  joint 
  of 
  the 
  antennas 
  are 
  very 
  consider- 
  

   able, 
  yet 
  until 
  the 
  sexual 
  relations 
  are 
  fully 
  understood, 
  no 
  great 
  confidence 
  can 
  be 
  felt 
  in 
  

   such 
  characters, 
  where 
  the 
  external 
  appearance 
  is 
  so 
  uniform. 
  

  

  This 
  supposed 
  species 
  has 
  the 
  posterior 
  angles 
  of 
  the 
  thorax 
  very 
  small, 
  not 
  at 
  all 
  di- 
  

   vergent, 
  and 
  acute; 
  the 
  sides 
  of 
  the 
  thorax 
  are 
  broadly 
  rounded, 
  more 
  so 
  in 
  (the 
  female?) 
  

   one 
  sex 
  than 
  in 
  the 
  other; 
  the 
  last 
  joint 
  of 
  the 
  antennae 
  is 
  strongly 
  constricted 
  and 
  acu- 
  

   minate. 
  The 
  colour 
  varies 
  from 
  dark 
  reddish 
  brown 
  to 
  castaneous; 
  the 
  pectus 
  is 
  some- 
  

   times 
  darker 
  than 
  the 
  abdomen; 
  the 
  feet 
  are 
  paler. 
  

  

  9. 
  A. 
  tener, 
  valde 
  elongatus, 
  rufo-castaneus, 
  helvo-pubescens, 
  thorace 
  elongato, 
  antrorsum 
  sub- 
  

   angustato, 
  lateribus 
  rectis, 
  confertim 
  punctato, 
  minus 
  convexo, 
  angulis 
  posticis 
  acutis, 
  paulo 
  productis, 
  

   non 
  divergentibus, 
  clytris 
  striis 
  antice 
  subtiliter 
  punctatis, 
  interstitiis 
  fere 
  planis, 
  punctatis, 
  antennis 
  

   articulo 
  ultimo 
  non 
  constricto. 
  Long. 
  "GO. 
  

  

  One 
  specimen, 
  New 
  York; 
  possibly 
  the 
  true 
  male 
  of 
  the 
  preceding; 
  the 
  angles 
  of 
  the 
  

   thorax, 
  though 
  longer 
  are 
  still 
  acute; 
  the 
  sides 
  are 
  straight, 
  except 
  at 
  the 
  very 
  apex, 
  

   where 
  they 
  are 
  slightly 
  rounded; 
  the 
  dorsal 
  line 
  is 
  visible 
  only 
  at 
  the 
  base; 
  the 
  antennas 
  

   are 
  scarcely 
  longer 
  than 
  in 
  the 
  preceding, 
  but 
  their 
  last 
  joint 
  is 
  not 
  constricted. 
  It 
  has 
  

   the 
  general 
  appearance 
  of 
  Corymbites 
  pyrrhos, 
  but 
  the 
  thorax 
  is 
  less 
  elongate, 
  and 
  the 
  

   posterior 
  angles 
  less 
  produced. 
  

  

  10. 
  A. 
  consentaneus, 
  fusco-piceus, 
  helvo-pubescens, 
  thorace 
  latitudine 
  longioro, 
  ante 
  basin 
  

   non 
  latiore, 
  lateribus 
  ante 
  medium 
  late 
  rotundatis, 
  angulis 
  posticis 
  paulo 
  productis, 
  apice 
  rotundatis, 
  

   confertim 
  punctato, 
  postice 
  subcanaliculato, 
  elytris 
  striis 
  antice 
  profundius 
  punctatis, 
  interstitiis 
  paulo 
  

   convexis, 
  punctatis, 
  pedibus 
  antennisque 
  ferrugineis, 
  vel 
  piceis, 
  his 
  articulo 
  ultimo 
  constricto. 
  Long. 
  - 
  65- 
  

  

  One 
  specimen 
  from 
  New 
  York, 
  having 
  reddish 
  feet 
  and 
  antennae, 
  and 
  another 
  from 
  

   Michigan 
  with 
  the 
  same 
  parts 
  dark 
  brown. 
  This 
  species 
  seems 
  different 
  on 
  account 
  of 
  

   the 
  longer 
  and 
  more 
  obtuse 
  thoracic 
  angles, 
  which 
  prevent 
  it 
  from 
  being 
  associated 
  with 
  

   either 
  of 
  the 
  two 
  preceding; 
  the 
  thoracic 
  angles 
  do 
  not 
  diverge 
  at 
  all, 
  in 
  which 
  respect 
  with 
  

   diners 
  from 
  the 
  next, 
  but 
  may, 
  nevertheless, 
  be 
  the 
  male 
  of 
  it. 
  The 
  thorax 
  is 
  as 
  densely 
  

   punctured 
  as 
  in 
  A. 
  melanopthalmus. 
  

  

  11. 
  A. 
  bilobatus, 
  nigro-piceus, 
  helvo-pubescens, 
  thorace 
  latitudine 
  longiore, 
  convexiusculo, 
  

   medio 
  parcius, 
  lateribus 
  sat 
  dense 
  punctato, 
  lateribus 
  vix 
  late 
  rotundatis, 
  angulis 
  posticis 
  paulo 
  pro- 
  

   ductis, 
  divergentibus 
  apice 
  rotundatis, 
  elytris 
  striis 
  antice 
  profunde 
  punctatis, 
  interstitiis 
  paulo 
  con- 
  

   vexis 
  punctatis, 
  pedibus 
  ferrugineis, 
  antennis 
  fuscis, 
  articulo 
  ultimo 
  constricto. 
  Long. 
  *60. 
  

  

  Mater 
  bilobatus 
  Say, 
  Trans. 
  Am. 
  Phil. 
  Soc. 
  6, 
  174. 
  

  

  One 
  specimen, 
  Wisconsin, 
  Dr. 
  Hoy. 
  Say 
  describes 
  the 
  antennas 
  as 
  of 
  the 
  same 
  colour 
  

   as 
  the 
  legs, 
  but 
  we 
  see 
  from 
  the 
  preceding 
  species 
  that 
  this 
  is 
  not 
  a 
  constant 
  character. 
  

   This 
  one 
  differs 
  by 
  its 
  more 
  convex 
  and 
  less 
  densely 
  punctured 
  thorax, 
  and 
  the 
  more 
  di- 
  

   vergent 
  and 
  more 
  rounded 
  angles; 
  the 
  sides 
  of 
  the 
  thorax 
  are 
  very 
  slightly 
  rounded, 
  and 
  

   are 
  a 
  little 
  sinuous 
  near 
  the 
  posterior 
  angles. 
  From 
  all 
  the 
  others, 
  except 
  the 
  preceding, 
  

   this 
  is 
  known 
  by 
  the 
  more 
  deeply 
  punctured 
  strias 
  of 
  the 
  elytra. 
  

  

  