﻿168 
  REVISION 
  OF 
  THE 
  ELATERID.K 
  

  

  Middle 
  States. 
  Differs 
  from 
  the 
  preceding 
  in 
  tlie 
  thorax 
  not 
  being 
  channelled 
  behind, 
  

   and 
  in 
  the 
  punctuation 
  becoming 
  finer 
  near 
  the 
  base; 
  also 
  in 
  the 
  elytra 
  being 
  slightly 
  nar- 
  

   rowed 
  from 
  the 
  base, 
  and 
  less 
  obtuse 
  at 
  the 
  apex, 
  and 
  in 
  the 
  interstices 
  being 
  less 
  densely 
  

   punctured. 
  The 
  antennae 
  are 
  a 
  little 
  shorter 
  than 
  the 
  thorax 
  and 
  strongly 
  serrate. 
  

  

  20. 
  E. 
  nigricans, 
  atcr, 
  hclvo-pubescens, 
  thorace 
  punctato, 
  posticc 
  canaliculate-, 
  clytris 
  acutius- 
  

   culis, 
  striis 
  punctatis, 
  interstitiis 
  remote 
  rugose 
  punctatis, 
  antennis 
  piccis 
  artieulis 
  2 
  ct 
  -'5 
  subsequalibus, 
  

   pedibus 
  ferrugincis. 
  Long. 
  "31. 
  

  

  Ampedus 
  nigricans 
  Germ. 
  Zeitschr. 
  5, 
  170. 
  

  

  Mater 
  testaceipes 
  Mels. 
  Proc. 
  Acad. 
  Nat. 
  Sc. 
  2, 
  213. 
  

  

  Pennsylvania 
  and 
  New 
  York. 
  Differs 
  from 
  E. 
  moles 
  tus 
  by 
  its 
  less 
  obtuse 
  elytra, 
  

   and 
  from 
  E. 
  f 
  u 
  s 
  c 
  a 
  t 
  u 
  s 
  by 
  the 
  punctuation 
  of 
  the 
  thorax 
  not 
  being 
  fine 
  at 
  the 
  base, 
  and 
  by 
  

   the 
  dorsal 
  channel 
  being 
  distinct 
  posteriorly. 
  In 
  the 
  specimens 
  seen, 
  the 
  thorax 
  is 
  nar- 
  

   rowed 
  anteriorly 
  from 
  the 
  middle, 
  and 
  is 
  a 
  little 
  longer 
  than 
  wide 
  ; 
  Germar 
  describes 
  the 
  

   thorax 
  as 
  being 
  "latitudinc 
  baseos 
  subbrevior;" 
  but 
  this 
  difference 
  may 
  be 
  sexual. 
  

  

  21. 
  E. 
  ursulus, 
  ater, 
  nigro-pubescens, 
  thorace 
  punctato, 
  postice 
  subcanaliculato, 
  elytris 
  posticc 
  

   obtusioribus, 
  striis 
  punctatis, 
  interstitiis 
  rugose 
  punctatis, 
  antennis 
  articulo 
  3'° 
  secundo 
  paulo 
  longiore, 
  

   pedibus 
  rufo-piceis, 
  vel 
  nigro-piceis. 
  Long. 
  "31. 
  

  

  Melsheimer, 
  Proc. 
  Acad. 
  Nat. 
  Sc. 
  2, 
  213. 
  

  

  Pennsylvania 
  and 
  New 
  York. 
  This 
  species 
  is 
  readily 
  distinguished 
  from 
  the 
  preceding 
  

   closely 
  allied 
  species 
  by 
  its 
  pubescence 
  being 
  finer, 
  and 
  so 
  dark 
  coloured 
  as 
  to 
  be 
  almost 
  

   invisible, 
  unless 
  viewed 
  laterally; 
  the 
  thorax 
  is 
  a 
  little 
  longer 
  than 
  wide, 
  and 
  is 
  narrowed 
  

   almost 
  from 
  the 
  base 
  and 
  rounded 
  on 
  the 
  sides. 
  

  

  This 
  species 
  seems 
  subject 
  to 
  variations 
  : 
  in 
  the 
  type 
  the 
  interstices 
  of 
  the 
  elytra 
  are 
  

   sparsely 
  punctured, 
  and 
  the 
  feet 
  dark 
  rufo-piceous; 
  in 
  two 
  other 
  specimens 
  the 
  feet 
  are 
  

   black, 
  and 
  the 
  elytra 
  more 
  densely 
  rugous. 
  I 
  should 
  have 
  considered 
  the 
  type 
  as 
  Ampe- 
  

   dus 
  pedal 
  is 
  Germ. 
  (Zeitschr. 
  5, 
  176,) 
  but 
  the 
  thorax 
  is 
  not 
  densely 
  punctured, 
  as 
  re- 
  

   quired 
  by 
  his 
  description. 
  

  

  22. 
  E. 
  lacustris, 
  ater, 
  griseo-pubescens, 
  thorace 
  punctato, 
  antrorsum 
  angustato, 
  elytris 
  basi 
  late 
  

   ferrugincis, 
  striis 
  punctatis, 
  interstitiis 
  subconvexis, 
  disperse 
  punctatis, 
  antennis 
  pedibusque 
  testaceis, 
  

   illis 
  artieulis 
  2 
  et 
  3 
  subwqualibus. 
  Long. 
  "22. 
  

  

  One 
  specimen, 
  Lake 
  Superior. 
  The 
  thorax 
  is 
  narrowed 
  from 
  the 
  middle 
  to 
  the 
  apex, 
  

   and 
  broadly 
  rounded 
  on 
  the 
  sides; 
  it 
  is 
  scarcely 
  longer 
  than 
  wide, 
  the 
  elytra 
  are 
  parallel 
  

   anteriorly, 
  obtusely 
  rounded 
  posteriorly; 
  the 
  antenna; 
  are 
  not 
  longer 
  than 
  the 
  thorax, 
  

   which 
  character 
  would 
  distinguish 
  it 
  from 
  Ampedus 
  pull 
  us 
  Germ. 
  (Zeitschr. 
  5, 
  162.) 
  

  

  - 
  23. 
  E. 
  f 
  us 
  cuius, 
  ater, 
  helvo-pubescens, 
  thorace 
  punctato, 
  ante 
  medium 
  angustato, 
  angulis 
  posti- 
  

   cis 
  testaceis, 
  elytris 
  subtilius 
  striatis, 
  striis 
  punctatis, 
  interstitiis 
  planis 
  confertim 
  punctatis, 
  testaceis, 
  

   sutura 
  late 
  infuscata, 
  antennis 
  pedibusque 
  testaceo-fuscis, 
  illis 
  artieulis 
  2 
  et 
  3 
  fequalibus. 
  Long. 
  -20. 
  

  

  Lake 
  Superior, 
  two 
  specimens. 
  The 
  thorax 
  is 
  not 
  longer 
  than 
  wide, 
  and 
  tolerably 
  

   strongly 
  rounded 
  on 
  the 
  sides, 
  which 
  are 
  parallel 
  behind 
  the 
  middle. 
  The 
  elytra 
  are 
  pa- 
  

   rallel 
  on 
  the 
  sides, 
  and 
  gradually 
  somewhat 
  obtusely 
  rounded 
  at 
  the 
  tip. 
  The 
  antenna? 
  

   are 
  as 
  lon^ 
  as 
  the 
  thorax. 
  

  

  