﻿I.il 
  REVISION 
  OF 
  THE 
  ELATEKJDjE 
  

  

  21. 
  L. 
  agonus, 
  elongatua, 
  piceo-seneus, 
  densius 
  cinereo-pubescens, 
  clypeo 
  truncato, 
  vix 
  prorai- 
  

   nulo, 
  thorace 
  latitudine 
  longiore, 
  Iateribus 
  late 
  rotundatis, 
  densius 
  punetato, 
  postice 
  canaliculato, 
  an- 
  

   gulis 
  postieis 
  vix 
  obsolete 
  carinatis 
  brevibus 
  fere 
  obtusis, 
  elytris 
  fusco-testaceis, 
  striis 
  punctatis, 
  inter- 
  

   stitiis 
  punctatis, 
  antennis 
  pedibusque 
  rufo-testaceis, 
  illis 
  articulis 
  2 
  et 
  3 
  coniunctis 
  4'" 
  vix 
  longioribus. 
  

   Long. 
  - 
  38. 
  

  

  Elater 
  agonus 
  Say, 
  Trans. 
  Am. 
  Phil. 
  Soc. 
  0, 
  171. 
  

  

  A 
  typical 
  specimen 
  in 
  Dr. 
  Harris' 
  collection: 
  locality 
  not 
  marked. 
  This 
  species 
  is 
  

   very 
  similar 
  to 
  L. 
  cctypus, 
  but. 
  the 
  posterior 
  angles 
  of 
  t 
  ho 
  thorax 
  are 
  not 
  at 
  all 
  produced, 
  

   and 
  their 
  apex 
  is 
  not 
  acute: 
  the 
  ordinary 
  carina 
  is 
  very 
  small, 
  and 
  hardly 
  visible. 
  

  

  '2'2. 
  L. 
  defin 
  itus, 
  cylindricus 
  piccus, 
  tenuiter 
  pubescens, 
  thorace 
  confertissitne 
  punetato, 
  angii- 
  

   tis 
  postieis 
  rectis 
  non 
  carinatis 
  subtestaceis, 
  elytris 
  striis 
  profundis 
  punctatis, 
  interstitiis 
  vage 
  punc- 
  

   tatis, 
  antennis 
  basi 
  pallidioribus. 
  Long. 
  -19 
  — 
  -23. 
  

  

  Ziegler, 
  Proc. 
  Acad. 
  Nat. 
  Sc. 
  2, 
  2GS. 
  

  

  Middle 
  and 
  Southern 
  States, 
  rare. 
  In 
  one 
  specimen 
  the 
  elytra 
  are 
  brownish. 
  

  

  23. 
  L. 
  in 
  fern 
  us, 
  cylindricus, 
  piccus, 
  tenuiter 
  pubescens, 
  thorace 
  dense 
  grossius 
  punetato, 
  niar- 
  

   gine 
  onmi 
  testacco, 
  angulis 
  postieis 
  rectis, 
  non 
  carinatis, 
  elytris 
  striis 
  profundis 
  punctatis, 
  interstitiis 
  

   parce 
  punctatis, 
  pectoribus, 
  pedibus 
  antennisque 
  basi 
  testaceis, 
  abdomine 
  nigricante. 
  Long. 
  '15 
  — 
  "17. 
  

  

  Pennsylvania 
  and 
  New 
  York, 
  not 
  rare. 
  The 
  under 
  surface 
  of 
  the 
  thorax 
  is 
  usually 
  tes- 
  

   taceous; 
  sometimes 
  it 
  is 
  fuscous, 
  with 
  the 
  sutures 
  paler. 
  The 
  pale 
  margin 
  of 
  the 
  thorax 
  

   is 
  dilated 
  at 
  each 
  angle, 
  so 
  as 
  to 
  appear 
  like 
  four 
  small 
  yellow 
  spots: 
  the 
  disc 
  of 
  the 
  tho- 
  

   rax 
  is 
  slightly 
  channelled 
  posteriorly. 
  

  

  24. 
  L. 
  vagus, 
  piceus, 
  subceneus, 
  tenuiter 
  cinereo-pubescens, 
  clypeo 
  medio 
  non 
  marginato, 
  thorace 
  

   latitudine 
  brcviore 
  antrorsum 
  modice 
  angustato, 
  Iateribus 
  antico 
  paulo 
  rotundatis, 
  angulis 
  postieis 
  

   subcarinatis, 
  acutis, 
  divaricatis, 
  subtilius 
  punetato, 
  linea 
  dorsali 
  pone 
  medium 
  Ircvi, 
  elytris 
  confertim 
  

   punctatis 
  stria 
  suturali 
  sola 
  vix 
  conspicua, 
  basi 
  margineque 
  plus 
  minusve 
  testaceis, 
  apice 
  obtuse 
  ro- 
  

   tundatis, 
  pedibus 
  testaceis 
  femoribus 
  infuscatis, 
  antennis 
  nigris 
  articulis 
  2 
  et 
  3 
  tequalibus 
  4 
  10 
  coniunctis 
  

   longioribus. 
  Long. 
  '29 
  — 
  -35. 
  

  

  Lake 
  Superior, 
  on 
  the 
  northern 
  shore. 
  This 
  species 
  and 
  the 
  next 
  differ 
  considerably 
  

   from 
  all 
  the 
  others 
  in 
  appearance, 
  as 
  well 
  as 
  by 
  the 
  absence 
  of 
  the 
  elytral 
  strise. 
  

   Nevertheless, 
  on 
  close 
  comparison, 
  nothing 
  of 
  a 
  generic 
  value 
  can 
  be 
  found 
  to 
  separate 
  

   them. 
  The 
  front 
  is 
  indeed 
  not 
  margined 
  anteriorly, 
  but 
  the 
  lateral 
  margins 
  are 
  slightly 
  

   advanced, 
  so 
  that 
  it 
  presents, 
  in 
  certain 
  directions, 
  the 
  same 
  truncate 
  appearance 
  seen 
  in 
  

   other 
  species 
  of 
  the 
  genus. 
  The 
  body 
  beneath 
  is 
  black, 
  slightly 
  bronzed. 
  The 
  elytra 
  of 
  

   the 
  female 
  are 
  gradually 
  dilated 
  posteriorly, 
  so 
  as 
  to 
  be 
  about 
  one-third 
  wider 
  than 
  the 
  

   thorax; 
  in 
  the 
  male 
  they 
  are 
  parallel 
  on 
  the 
  sides; 
  in 
  both 
  sexes 
  obtusely 
  rounded 
  at 
  the 
  

   apex; 
  the 
  sides 
  of 
  the 
  thorax 
  are 
  more 
  rounded 
  anteriorly 
  in 
  the 
  female 
  than 
  in 
  the 
  male. 
  

  

  25. 
  L. 
  estriatus, 
  piceus, 
  subreneus, 
  cinereo-pubescens, 
  clypeo 
  medio 
  non 
  marginato, 
  thorace 
  la- 
  

   titudine 
  fere 
  sesqui 
  breviore, 
  antrorsum 
  angustato, 
  et 
  Iateribus 
  rotundato, 
  angulis 
  postieis 
  subcarinatis 
  

   divaricatis, 
  acutis, 
  subtilius 
  punetato, 
  linea 
  dorsali 
  postice 
  sublsevi, 
  elytris 
  subtilius 
  punctatis, 
  striis 
  

   obsoletis, 
  basi 
  margineque 
  testaceis, 
  apice 
  obtusis, 
  antennis 
  basi 
  testaceis, 
  articulo 
  3'° 
  2 
  ml0 
  longiore 
  et 
  

   4 
  t0 
  ffiquali. 
  Long. 
  -26. 
  

  

  Eagle 
  Harbor, 
  Lake 
  Superior. 
  Smaller 
  than 
  the 
  preceding, 
  which 
  it 
  resembles 
  very 
  

  

  