﻿158 
  ItKVISION 
  OF 
  THE 
  ELATERID/K 
  

  

  Lake 
  Superior, 
  not 
  rare 
  This 
  species 
  connects 
  this 
  with 
  the 
  last 
  division 
  of 
  the 
  genus: 
  

   the 
  second 
  and 
  third 
  joints 
  of 
  the 
  antennae 
  arc 
  hardly 
  smaller 
  than 
  the 
  fourth, 
  and 
  the 
  

   lamina' 
  of 
  the 
  posterior 
  coxa- 
  are 
  distinctly 
  wider 
  internally: 
  the 
  tooth 
  is, 
  however, 
  not 
  so 
  

   prominent 
  as 
  in 
  the 
  following 
  species, 
  and 
  the 
  clypeus 
  is 
  decidedly 
  truncate 
  at 
  the 
  tip, 
  and 
  

   considerably 
  elevated 
  above 
  the 
  labrnin: 
  the 
  lateral 
  margin 
  of 
  the 
  thorax 
  is 
  well 
  marked 
  

   for 
  its 
  whole 
  length, 
  and 
  is 
  not 
  deflexed 
  so 
  as 
  to 
  helong 
  to 
  the 
  under 
  surface, 
  as- 
  in 
  the 
  pre- 
  

   ceding 
  species. 
  

  

  11. 
  D. 
  pauper, 
  atcr, 
  pubescens, 
  clypco 
  truncato, 
  thorace 
  latitudine 
  vix 
  longiore, 
  lateribus 
  pa- 
  

   rallelis, 
  ad 
  apicem 
  rotundatis, 
  apice 
  ct 
  angulis 
  postieis 
  testaceis, 
  confertim 
  punctato, 
  postice 
  canalicu- 
  

   lato, 
  elytris 
  striis 
  acutis 
  punctulatis, 
  interstitiis 
  planis 
  confertim 
  rugose 
  punctulatis, 
  vitta 
  rufo-picea 
  

   a 
  humero 
  ad 
  apicem 
  plus 
  minus 
  ve 
  distincta, 
  antennis 
  fuscis, 
  basi 
  pedibusque 
  rufo-testaceis. 
  Lung. 
  

   •22 
  -29. 
  

  

  Abundant 
  throughout 
  the 
  Atlantic 
  parts 
  of 
  North 
  America. 
  A 
  specimen 
  was 
  sent 
  me 
  by 
  

   Dr. 
  Harris 
  as 
  Elater 
  inquinatus 
  Say, 
  which, 
  however, 
  being 
  said 
  (Trans. 
  Am. 
  Phil. 
  Soc. 
  6, 
  

   17.")) 
  to 
  have 
  the 
  fourth 
  tarsal 
  joint 
  lobed, 
  and 
  the 
  thorax 
  with 
  an 
  elongate 
  basal 
  fissure 
  

   each 
  side, 
  cannot 
  belong 
  to 
  this 
  genus. 
  From 
  the 
  manner 
  in 
  which 
  Say 
  distributed 
  types 
  

   of 
  his 
  species 
  in 
  Europe, 
  I 
  fear 
  that 
  he 
  was 
  not 
  very 
  careful 
  in 
  naming 
  his 
  duplicates, 
  

   probably 
  trusting 
  to 
  his 
  usually 
  excellent 
  descriptions, 
  for 
  the 
  identification 
  of 
  those 
  de- 
  

   scribed 
  by 
  him. 
  I 
  am 
  inclined 
  to 
  believe 
  that 
  E. 
  inquinatus 
  Say 
  must 
  be 
  referred 
  to 
  

   Adrastus, 
  and 
  that 
  the 
  serration 
  of 
  the 
  ungues 
  was 
  probably 
  overlooked. 
  

  

  Two 
  specimens 
  from 
  Lake 
  Superior 
  are 
  much 
  larger, 
  ("34 
  unc.) 
  and 
  have 
  the 
  striae 
  of 
  

   the 
  elytra 
  less 
  distinctly 
  marked. 
  They 
  do 
  not 
  seem, 
  however, 
  to 
  constitute 
  a 
  separate 
  

   species. 
  

  

  12. 
  D. 
  subustus, 
  fusco-niger, 
  pubescens, 
  thorace 
  rufo-testaceo, 
  marginibus 
  dilutioribus, 
  dense 
  

   punctato, 
  latitudine 
  vix 
  longiore, 
  lateribus 
  parallelis 
  antice 
  vix 
  rotundatis, 
  elytris 
  rufo-testaceis, 
  basi, 
  

   sutura 
  marginecpie 
  leviter 
  infuscatis, 
  striis 
  punctatis 
  interstitiis 
  planis, 
  confertim 
  rugose 
  punctatis, 
  

   antennis 
  nigro-piceis, 
  pedibus 
  rufis. 
  Long. 
  -27. 
  

  

  Two 
  specimens 
  found 
  at 
  San 
  Francisco, 
  California. 
  Somewhat 
  more 
  slender 
  than 
  D. 
  

   pauper, 
  which, 
  except 
  in 
  colour, 
  it 
  very 
  much 
  resembles: 
  the 
  lateral 
  oblique 
  lines 
  of 
  the 
  

   front 
  are 
  indistinctly 
  connected 
  anteriorly, 
  and 
  the 
  vertex 
  is 
  not 
  marked 
  with 
  the 
  usual 
  

   oblong 
  fovea. 
  

  

  13. 
  D. 
  bigeminatus, 
  subcylindricus, 
  ater, 
  pubescens, 
  thorace 
  latitudine 
  fere 
  soscpii 
  longiore 
  

   lateribus 
  parallelis, 
  antice 
  vix 
  rotundatis, 
  confertim 
  punctato, 
  elytris 
  macula 
  utrinque 
  elongata 
  pone 
  

   basin, 
  alteraque 
  pone 
  medium 
  'rotundata, 
  bote 
  rufo-testaceis, 
  striis 
  punctatis, 
  interstitiis 
  sat 
  dense 
  ru- 
  

   gose 
  punctatis, 
  pedibus 
  testaceis, 
  antennis 
  vel 
  fuscis 
  vol 
  testaceis. 
  Long. 
  '21. 
  

  

  Elater 
  bigeminatus 
  Randall, 
  Bost. 
  Journ. 
  Nat. 
  Hist. 
  

  

  9 
  

  

  •j 
  i. 
  

  

  Lake 
  Superior, 
  Massachusetts 
  and 
  Pennsylvania, 
  rare. 
  This 
  species 
  has 
  the 
  commis- 
  

   sure 
  of 
  the 
  oblique 
  frontal 
  lines 
  quite 
  distinct, 
  as 
  in 
  Adrastus, 
  but 
  the 
  ungues 
  are 
  abso- 
  

   lutely 
  without 
  teeth: 
  the 
  vertex, 
  as 
  in 
  the 
  preceding 
  species, 
  is 
  not 
  foveate. 
  

  

  Adrastus 
  Escli. 
  

   The 
  species 
  below 
  mentioned 
  have 
  the 
  third 
  and 
  fourth 
  joints 
  of 
  the 
  tarsi 
  slightly 
  lobed 
  

  

  