﻿OF 
  THE 
  UNITED 
  STATES. 
  441 
  

  

  Diacanthus 
  s 
  t 
  i 
  c 
  I 
  i 
  c 
  u 
  s 
  and 
  r 
  u 
  s 
  s 
  i 
  c 
  o 
  11 
  i 
  s 
  , 
  Germ. 
  (Zeitschr., 
  4, 
  74,) 
  seem 
  to 
  be 
  closely 
  

   related 
  to 
  this 
  species, 
  but 
  must 
  be 
  different: 
  the 
  former 
  has 
  the 
  thorax 
  slightly 
  rounded 
  

   on 
  the 
  sides; 
  the 
  latter 
  has 
  the 
  thorax 
  and 
  feet 
  rufous, 
  and 
  the 
  thorax 
  strongly 
  rounded 
  

   on 
  the 
  sides. 
  

  

  Elaler 
  r 
  u 
  br 
  i 
  c 
  ol 
  1 
  is 
  Say, 
  (Journ. 
  Acad. 
  3, 
  177,) 
  quoted 
  by 
  Germar, 
  under 
  his 
  D. 
  rus- 
  

   sicollis, 
  is 
  in 
  reality 
  Herbst's 
  species 
  of 
  the 
  same 
  name, 
  and 
  will 
  be 
  found 
  under 
  Elater 
  

   rubricollis 
  of 
  the 
  present 
  essay. 
  

  

  20. 
  C. 
  sulcicollis, 
  elongatus, 
  parallelus, 
  nigro-piceus, 
  glaber, 
  thorace 
  antice 
  sublatiore 
  latitu- 
  

   dine 
  fore 
  sesqui 
  longiore, 
  lateribus 
  rectis, 
  apice 
  breviter 
  rotundatia, 
  minus 
  convexo, 
  confertim 
  punc- 
  

   tato, 
  profunde 
  canaliculato, 
  angulis 
  posticis 
  acutis, 
  elytris 
  apice 
  rotundatim 
  attenuatis, 
  striis 
  punctatis, 
  

   interstitiis 
  modice 
  convexis, 
  punctulatis, 
  epipleuris 
  pedibusque 
  piceo-rufis. 
  Long. 
  "55 
  — 
  '6. 
  

  

  Elater 
  parallelus 
  || 
  Say, 
  Ann. 
  Lye. 
  1, 
  256. 
  

  

  Elater 
  sulcicollis 
  Say, 
  Trans. 
  Am. 
  Pbil. 
  Soc. 
  6, 
  168. 
  

  

  Middle 
  and 
  Southern 
  States, 
  rare. 
  The 
  joints 
  of 
  the 
  antennae 
  are 
  moderately 
  dilated 
  

   and 
  diminish 
  gradually 
  in 
  length 
  from 
  the 
  fourth. 
  

  

  A.— 
  3. 
  

  

  21. 
  C. 
  nubilipennis, 
  elongatus 
  linearis, 
  vix 
  pallide 
  pubescens, 
  niger, 
  fronte 
  subconcava, 
  tborace 
  

   latitudine 
  longiore, 
  antrorsum 
  vix 
  angustato, 
  lateribus 
  paulo 
  rotundatis, 
  minus 
  dense 
  punctato, 
  postice 
  

   canaliculato, 
  elytris 
  parallelis, 
  striis 
  punctatis, 
  interstitiis 
  disperse 
  punctulatis, 
  testaceis 
  pone 
  basin 
  

   et 
  ad 
  medium 
  infuscatis. 
  Long. 
  -oi. 
  

  

  One 
  specimen 
  from 
  Oregon, 
  Col. 
  M'Call. 
  The 
  posterior 
  angles 
  of 
  the 
  thorax 
  are 
  long 
  

   and 
  acute; 
  the 
  third 
  joint 
  of 
  the 
  antennas 
  is 
  equal 
  in 
  length 
  to 
  the 
  fourth, 
  but 
  is 
  not 
  at 
  all 
  

   dilated. 
  The 
  last 
  joint 
  is 
  wanting, 
  so 
  that 
  we 
  cannot 
  be 
  certain 
  that 
  it 
  belongs 
  to 
  this 
  

   division; 
  its 
  general 
  appearance, 
  however, 
  prevents 
  it 
  from 
  being 
  placed 
  in 
  any 
  other. 
  

   The 
  front 
  is 
  slightly 
  concave, 
  not 
  showing 
  the 
  quadrate 
  outline 
  which 
  may 
  be 
  perceived 
  

   in 
  the 
  others 
  of 
  this 
  group. 
  

  

  22. 
  C. 
  rerarius, 
  elongatus, 
  supra 
  glaber, 
  splendide 
  viridiaureus, 
  thorace 
  latitudine 
  longiore, 
  an- 
  

   trorsum 
  subangustato, 
  lateribus 
  late 
  rotundatis, 
  sat 
  dense 
  lateribus 
  confertim 
  punctato, 
  cupreo-mar- 
  

   ginato, 
  postice 
  subcanaliculato, 
  elytris 
  striis 
  punctatis, 
  interstitiis 
  parce 
  subtiliter 
  punctulatis, 
  anten- 
  

   nis 
  nigris, 
  articulo 
  3'° 
  non 
  dilatato. 
  Long. 
  "45 
  — 
  - 
  56. 
  

  

  Elater 
  urarius 
  Randall, 
  Bost. 
  Journ. 
  Nat. 
  Hist. 
  2, 
  7. 
  

  

  Elater 
  {diacanthus) 
  Racinci 
  Cbevrolat, 
  Rev. 
  ct 
  Mag. 
  de 
  Zoologie, 
  1852. 
  

  

  Lake 
  Superior, 
  Maine, 
  Newfoundland. 
  This 
  must 
  be 
  very 
  similar 
  to 
  C. 
  resplendens, 
  

   (Germ. 
  Zeitschr. 
  4, 
  60,) 
  which, 
  however, 
  must 
  have 
  the 
  third 
  joint 
  of 
  the 
  antennae 
  dilated. 
  

   In 
  my 
  catalogue 
  of 
  Lake 
  Superior 
  Coleoptera, 
  I 
  have 
  placed 
  them 
  as 
  synonymous, 
  but, 
  

   until 
  comparisons 
  are 
  made, 
  they 
  must 
  be 
  considered 
  as 
  distinct. 
  The 
  front 
  in 
  this 
  

   species 
  is 
  not 
  slightly 
  concave 
  as 
  in 
  the 
  preceding, 
  but 
  flattened, 
  not 
  quite 
  so 
  straight 
  

   along 
  the 
  anterior 
  part, 
  where 
  the 
  declivity 
  commences, 
  as 
  in 
  the 
  next 
  two 
  species, 
  but 
  

   showing 
  a 
  tendency 
  to 
  become 
  quadrangular; 
  the 
  antennas 
  of 
  both 
  sexes 
  are 
  strongly 
  

   serrate. 
  

  

  Varieties 
  occur 
  of 
  a 
  golden 
  copper, 
  and 
  also 
  of 
  a 
  bluish 
  green 
  colour. 
  

  

  