﻿OF 
  THE 
  UNITED 
  STATES. 
  479 
  

  

  densius 
  ad 
  latera, 
  elytris 
  a 
  basi 
  subangustatis, 
  striis 
  impressis 
  punctatis, 
  interstitiis 
  parce 
  punctulatis, 
  

   antennarum 
  articulo 
  3 
  i0 
  sequenti 
  sequali, 
  pedibusque 
  fusco-testaceis. 
  Long. 
  "37 
  — 
  - 
  43. 
  

  

  Nebraska 
  Territory. 
  The 
  difference 
  in 
  the 
  form 
  of 
  the 
  thorax 
  of 
  the 
  two 
  sexes 
  is 
  very 
  

   great: 
  in 
  the 
  male 
  the 
  sides 
  converge 
  regularly, 
  with 
  scarcely 
  any 
  curvature; 
  in 
  the 
  fe- 
  

   male 
  the 
  disc 
  is 
  more 
  convex, 
  and 
  the 
  sides 
  are 
  considerably 
  rounded, 
  especially 
  in 
  front: 
  

   the 
  third 
  joint 
  of 
  the 
  antenna^ 
  is 
  wider 
  than 
  usual, 
  and 
  nearly 
  as 
  wide 
  as 
  the 
  fourth. 
  

  

  26. 
  C. 
  p 
  er 
  tin 
  ax, 
  piceo-niger, 
  parce 
  longius 
  cinereo-pilosus, 
  fronte 
  subconcava, 
  thorace 
  latitu- 
  

   dine 
  subbreviore, 
  convexo, 
  lateribus 
  postice 
  parallelis, 
  ante 
  medium 
  valde 
  rotundatis, 
  parce 
  punctato, 
  

   punctis 
  in 
  medio 
  fere 
  obsoletis, 
  postice 
  canaliculato, 
  elytris 
  lateribus 
  parallelis, 
  postice 
  oblique 
  angus- 
  

   tatis, 
  striis 
  punctatis 
  vix 
  impressis, 
  interstitiis 
  parce 
  subtiliter 
  punctulatis, 
  antennis 
  pedibusque 
  rufis, 
  

   i 
  11 
  is 
  articulo 
  3 
  10 
  sequente 
  non 
  breviore. 
  Long. 
  *42. 
  

  

  Elater 
  pertinax 
  Say, 
  Trans. 
  Am. 
  Phil. 
  Soc. 
  6, 
  185. 
  

  

  Massachusetts 
  and 
  Georgia. 
  An 
  easily 
  recognised 
  species: 
  the 
  punctures 
  of 
  the 
  tho- 
  

   rax, 
  anteriorly 
  and 
  at 
  the 
  sides, 
  are 
  tolerably 
  large; 
  in 
  the 
  middle 
  they 
  are 
  almost 
  obsolete. 
  

  

  27. 
  C. 
  dub 
  i 
  us, 
  piceo-niger, 
  cinereo-pubescens, 
  fronte 
  non 
  concava, 
  tliorace 
  latitudine 
  non 
  bre- 
  

   viore, 
  lateribus 
  rectis, 
  convergcntibus, 
  apice 
  rotundatis, 
  parce 
  punctato, 
  subtilius 
  ad 
  medium, 
  postice 
  

   canaliculato, 
  elytris 
  antice 
  fere 
  parallelis, 
  striis 
  punctatis 
  vix 
  impressis, 
  interstitiis 
  rugose 
  punctulatis, 
  

   pedibus 
  antennisque 
  rufis, 
  bis 
  articulo 
  3 
  10 
  sequente 
  non 
  breviore. 
  Long. 
  "33. 
  

  

  One 
  specimen, 
  New 
  York. 
  The 
  deep 
  posterior 
  dorsal 
  channel, 
  and 
  the 
  fine 
  punctures 
  of 
  the 
  

   interstices 
  of 
  the 
  elytra 
  will 
  distinguish 
  this 
  from 
  the 
  next 
  species: 
  it 
  may 
  possibly 
  be 
  the 
  

   male 
  of 
  the 
  preceding 
  species, 
  but 
  there 
  is 
  no 
  evidence 
  of 
  it 
  except 
  the 
  general 
  similarity 
  

   of 
  sculpture: 
  the 
  pubescence 
  is 
  denser 
  and 
  not 
  so 
  long: 
  the 
  thorax, 
  however, 
  bears 
  pretty 
  

   much 
  the 
  same 
  relation 
  in 
  the 
  two 
  species 
  as 
  in 
  the 
  two 
  sexes 
  of 
  C. 
  cribulosus. 
  

  

  28. 
  C. 
  t 
  e 
  n 
  ax 
  , 
  piceo-niger, 
  cinereo-pubescens, 
  fronte 
  non 
  concava, 
  thorace 
  latitudine 
  longiore, 
  

   antrorsum 
  subangustato, 
  lateribus 
  antice 
  paulo 
  rotundatis, 
  parce 
  requaliter 
  punctato, 
  postice 
  vix 
  ob- 
  

   solete 
  canaliculato, 
  elytris 
  striis 
  punctatis, 
  interstitiis 
  minus 
  subtiliter 
  punctatis, 
  pedibus 
  antennisque 
  

   rufis, 
  his 
  articulo 
  3'° 
  sequente 
  paulo 
  breviore. 
  Long. 
  - 
  3 
  — 
  -35. 
  

  

  Elater 
  tenax 
  Say, 
  Trans. 
  Am. 
  Phil. 
  Soc. 
  6, 
  185. 
  

  

  Middle 
  and 
  Southern 
  States. 
  The 
  punctures 
  of 
  the 
  interstices 
  of 
  the 
  elytra 
  are 
  as 
  large 
  

   as 
  those 
  of 
  the 
  stria?, 
  and 
  will 
  distinguish 
  this 
  from 
  all 
  other 
  species 
  here 
  described. 
  The 
  

   striee 
  in 
  one 
  specimen 
  are 
  tolerably 
  deep; 
  in 
  two 
  others 
  they 
  are 
  not 
  impressed. 
  The 
  elytra 
  

   in 
  the 
  male 
  are 
  narrowed 
  slightly 
  from 
  the 
  base; 
  in 
  the 
  female 
  they 
  appear 
  nearly 
  parallel. 
  

  

  29. 
  C. 
  americanus, 
  fuscus, 
  cinereo-pubescens, 
  fronte 
  non 
  concava, 
  paulo 
  producta, 
  thorace 
  

   latitudine 
  non 
  longiore, 
  antrorsum 
  magis 
  angustato, 
  lateribus 
  ante 
  medium 
  rotundatis, 
  postice 
  breviter 
  

   canaliculato, 
  elytris 
  a 
  basi 
  angustatis, 
  striis 
  fortius 
  punctatis, 
  non 
  impressis, 
  interstitiis 
  parce 
  punctu- 
  

   latis, 
  antennis 
  articulo 
  3'° 
  secundo 
  asquali. 
  Long. 
  "28 
  — 
  '35. 
  

  

  Erichson, 
  Germ. 
  Zeitschr. 
  3, 
  114. 
  

  

  Elater 
  americanus 
  Herbst, 
  Kiifer, 
  10, 
  74; 
  tab. 
  165, 
  fig. 
  2. 
  

  

  A 
  very 
  common 
  species: 
  the 
  punctures 
  of 
  the 
  thorax 
  are 
  hardly 
  smaller 
  at 
  the 
  middle: 
  

   the 
  small 
  size 
  of 
  the 
  third 
  joint 
  of 
  the 
  antennae 
  will 
  distinguish 
  it 
  from 
  any 
  with 
  which 
  it 
  

   is 
  liable 
  to 
  be 
  confounded: 
  Erichson 
  mentions 
  neither 
  this, 
  nor 
  the 
  posterior 
  dorsal 
  chan- 
  

   vor.. 
  x.— 
  78 
  

  

  