﻿OF 
  THE 
  UNITED 
  STATES. 
  425 
  

  

  A. 
  Thorax 
  angiitis 
  posticis 
  non 
  carinatis, 
  apicc 
  rotunda 
  lis. 
  

  

  * 
  Antenna 
  articulis 
  2 
  el 
  3 
  cequalibus 
  V" 
  minoribus. 
  

  

  1. 
  P. 
  trivit 
  tatus, 
  fusco-tcstaccus, 
  cincreo-pubescens, 
  thorace 
  convexo, 
  elongato, 
  lateribus 
  rectis, 
  

   confcrtim 
  subtilius 
  punctato, 
  elytris 
  rufo-piceis, 
  sutura 
  margineque 
  infuscatis, 
  striis 
  punctatis, 
  inter- 
  

   stitiis 
  planis, 
  sat 
  dense 
  punctatis, 
  fronte 
  non 
  impressa. 
  Long. 
  - 
  4. 
  

  

  Athous 
  trivittatus 
  Melsheimer, 
  Proc. 
  Acad. 
  Nat. 
  Sc. 
  2, 
  157. 
  

  

  One 
  specimen 
  in 
  Dr. 
  Melsheimer's 
  collection. 
  This 
  species 
  differs 
  from 
  all 
  the 
  others 
  

   in 
  having 
  the 
  front 
  not 
  impressed 
  and 
  hardly 
  produced. 
  The 
  antenna? 
  and 
  feet 
  are 
  pale 
  

   testaceous. 
  

  

  ** 
  Antenna 
  vix 
  serrate, 
  articulo 
  3° 
  4'" 
  aquali, 
  vel 
  vix 
  minore. 
  

  

  2. 
  P. 
  B 
  right 
  we 
  Hi, 
  fuscus, 
  vel 
  testaceus 
  pubescens, 
  thorace 
  elongato, 
  plus 
  minusve 
  canaliculato, 
  

   convexiusculo, 
  confertim 
  punctato, 
  elytris 
  striis 
  valde 
  punctatis, 
  interstitiis 
  minus 
  convexis, 
  punctatis 
  

   et 
  parce 
  rugosis, 
  versus 
  basin 
  impressis 
  et 
  testaceis. 
  Long. 
  *42 
  — 
  - 
  47. 
  

  

  Kirby, 
  Fauna 
  Bor. 
  Am. 
  146. 
  

  

  Athous 
  oblongicollis 
  Mels. 
  Proc. 
  Acad. 
  Nat. 
  Sc. 
  2, 
  155. 
  

  

  Athous 
  arcticollis 
  Mels. 
  Proc. 
  Acad. 
  Nat. 
  Sc. 
  2, 
  156. 
  

  

  Middle 
  and 
  Southern 
  States, 
  not 
  rare. 
  The 
  specimen 
  described 
  by 
  Kirby 
  seems 
  to 
  

   have 
  been 
  a 
  pale 
  coloured 
  variety 
  of 
  this 
  species, 
  which 
  varies 
  much 
  in 
  colour. 
  In 
  the 
  male 
  

   the 
  thorax 
  is 
  constricted 
  before 
  the 
  posterior 
  angles, 
  which 
  are 
  slightly 
  divergent; 
  in 
  the 
  

   female, 
  the 
  sides 
  are 
  straight 
  and 
  the 
  angles 
  do 
  not 
  diverge; 
  the 
  dorsal 
  channel 
  is 
  never 
  

   deep, 
  and 
  is 
  frequently 
  wanting. 
  

  

  3. 
  P. 
  acanthus, 
  teneo-piceus, 
  pubescens, 
  thorace 
  elongato, 
  convexo, 
  subtilius 
  punctato, 
  angulis 
  

   rufescentibus, 
  elytris 
  striis 
  valdc 
  punctatis, 
  interstitiis 
  minus 
  convexis 
  punctatis, 
  versus 
  basin 
  impres- 
  

   sis, 
  epipleuris 
  pedibus 
  antennarumque 
  basi 
  testaceis. 
  Long. 
  -27 
  — 
  "35. 
  

  

  Mater 
  acanthus 
  Say, 
  Trans. 
  Am. 
  Phil. 
  Soc. 
  6, 
  178. 
  

  

  New 
  Jersey, 
  Mr. 
  Guex; 
  a 
  typical 
  specimen 
  in 
  Dr. 
  Harris' 
  collection. 
  Differs 
  from 
  the 
  

   preceding 
  by 
  its 
  smaller 
  size, 
  and 
  more 
  convex 
  and 
  more 
  finely 
  punctured 
  thorax. 
  Otherwise 
  

   there 
  appears 
  to 
  be 
  no 
  satisfactory 
  difference; 
  the 
  front 
  is 
  sometimes 
  testaceous; 
  pro- 
  

   bably 
  pale-coloured 
  varieties 
  will 
  occur. 
  

  

  B. 
  Thorax 
  angulis 
  posticis 
  subtiliter 
  carinatis, 
  apicc 
  rotundatis. 
  

  

  * 
  Antenna 
  articulo 
  3 
  io 
  4"> 
  aqitati. 
  

  

  4. 
  P. 
  scapular 
  is, 
  ater 
  opacus, 
  subtiliter 
  fusco-pubescens, 
  thorace 
  elongato, 
  antrorsum 
  subangus- 
  

   tato, 
  confertissime 
  punctato, 
  angulis 
  posticis 
  testaceis, 
  carina 
  angulari 
  margini 
  approximata, 
  indis- 
  

   tincta, 
  elytris 
  macula 
  basali 
  lutea, 
  striis 
  punctatis, 
  interstitiis 
  scabro-punctatis. 
  Long. 
  -4. 
  

  

  Elater 
  scapularis 
  Say, 
  Trans. 
  Am. 
  Phil. 
  Soc. 
  6, 
  178. 
  

  

  The 
  typical 
  specimen 
  from 
  New 
  Hampshire 
  kindly 
  loaned 
  me 
  by 
  Dr. 
  Harris. 
  The 
  

   feet 
  and 
  antennae 
  are 
  entirely 
  black. 
  The 
  lobes 
  of 
  the 
  tarsi 
  are 
  smaller 
  than 
  in 
  the 
  other 
  

   species, 
  and 
  with 
  some 
  species 
  contained 
  in 
  Athous, 
  would 
  seem 
  to 
  indicate 
  that 
  the 
  two 
  

   genera 
  should 
  be 
  united. 
  The 
  antenna?, 
  as 
  in 
  the 
  next 
  species, 
  are 
  elongated. 
  

  

  5. 
  P. 
  cucullatus, 
  testaceus, 
  vel 
  piceo-testaceus, 
  fulvo-pubescens, 
  thorace 
  elongato, 
  antrorsum 
  

  

  