﻿OF 
  THE 
  UNITED 
  STATES. 
  505 
  

  

  APPENDIX 
  

  

  Page 
  454. 
  In 
  Atractopterus 
  add 
  the 
  following 
  species: 
  

  

  A. 
  silaceus, 
  rufo-testaccus, 
  fere 
  opacus, 
  tenuiter 
  flavo-pubescens, 
  thoracc 
  latitudine 
  sesqui 
  lon- 
  

   giore, 
  antrorsum 
  subangustato, 
  latcribus 
  antice 
  late 
  rotundatis, 
  angulis 
  posticis 
  pallidis 
  subdivergenti- 
  

   bus, 
  disco 
  confertissime 
  subtiliter 
  punctato, 
  elytris 
  fere 
  parallelis 
  pallidioribus, 
  striis 
  punctatisi 
  mpres- 
  

   sis, 
  interstitiis 
  vix 
  convexis, 
  punctatis, 
  antennis 
  articulis 
  2 
  et 
  3 
  rcqualibus, 
  4'° 
  coniunctis 
  fere 
  sequalibua. 
  

   Long. 
  -3— 
  -34. 
  

  

  Elater 
  silaceus 
  Say, 
  Ann. 
  Lye. 
  of 
  New 
  York, 
  1, 
  260. 
  

  

  Middle 
  and 
  Southern 
  States, 
  not 
  rare. 
  This 
  species 
  differs 
  from 
  the 
  following 
  by 
  its 
  

   less 
  slender 
  form 
  and 
  less 
  elongated 
  antenna?. 
  The 
  head 
  and 
  thorax 
  are 
  somewhat 
  darker 
  

   than 
  the 
  elytra, 
  but 
  never 
  become 
  piceous 
  or 
  black: 
  the 
  thorax 
  is 
  very 
  obsoletely 
  chan- 
  

   nelled: 
  the 
  abdomen 
  is 
  rufous, 
  and 
  the 
  postpectus 
  dusky. 
  

  

  A. 
  umbraticus, 
  piceo-niger, 
  fere 
  opacus, 
  tenuiter 
  flavo-pubescens, 
  thorace 
  latitudine 
  sesqui 
  lon- 
  

   giore, 
  antrorsum 
  subangustato, 
  lateribus 
  vix 
  rotundatis, 
  angulis 
  posticis 
  testaceis 
  subdivergentibus, 
  

   confertissime 
  punctato, 
  elytris 
  fere 
  parallelis 
  fuscis, 
  versus 
  basin 
  pallidioribus, 
  striis 
  impressis, 
  punc- 
  

   tatis, 
  interstitiis 
  punctatis, 
  pedibus 
  antennisque 
  fusco-testaceis, 
  his 
  valde 
  elongatis, 
  articulis 
  2 
  et 
  3 
  

   coniunctis 
  4'° 
  duplo 
  brevioribus. 
  Long. 
  -3. 
  

  

  Middle 
  and 
  Southern 
  States. 
  This 
  is 
  probably 
  what 
  Say 
  alluded 
  to 
  as 
  a 
  variety 
  of 
  the 
  

   preceding 
  species, 
  having 
  the 
  thorax 
  and 
  abdomen 
  almost 
  black. 
  The 
  thorax, 
  as 
  in 
  A. 
  

   silaceus, 
  is 
  very 
  indistinctly 
  channelled. 
  

  

  With 
  regard 
  to 
  the 
  difference 
  between 
  Atractopterus 
  and 
  Dolopius, 
  of 
  this 
  essay, 
  a 
  few 
  

   words 
  of 
  explanation 
  may 
  be 
  necessary. 
  The 
  essential 
  differences 
  may 
  be 
  reduced 
  to 
  two 
  : 
  

   1 
  . 
  The 
  head 
  of 
  Atractopterus 
  is 
  not 
  perpendicular, 
  and 
  the 
  mouth 
  not 
  inferior 
  ; 
  and 
  2. 
  The 
  

   basal 
  joint 
  of 
  the 
  antenna? 
  is 
  not 
  elongated. 
  

  

  It 
  may 
  be 
  a 
  matter 
  of 
  dispute 
  by 
  what 
  name 
  the 
  genus 
  called 
  Dolopius, 
  in 
  the 
  present 
  

   essay, 
  should 
  be 
  properly 
  denoted. 
  I 
  confess 
  that 
  I 
  may 
  have 
  acted 
  without 
  due 
  delibe- 
  

   ration 
  in 
  selecting 
  the 
  name 
  Dolopius, 
  as 
  it 
  has 
  already 
  been 
  placed 
  as 
  a 
  synonym 
  to 
  Ec- 
  

   tinus 
  by 
  Latreille: 
  I 
  would, 
  therefore, 
  propose 
  to 
  substitute 
  for 
  it 
  Aguiotes, 
  as 
  liable 
  to 
  

   fewer 
  objections. 
  My 
  reason 
  for 
  selecting 
  Dolopius 
  was, 
  that 
  most 
  of 
  the 
  native 
  species 
  

   previously 
  described 
  had 
  been 
  referred 
  to 
  that 
  genus, 
  and 
  I 
  was 
  unwilling 
  to 
  introduce 
  any 
  

   change 
  of 
  name, 
  except 
  in 
  cases 
  where 
  it 
  was 
  absolutely 
  necessary. 
  On 
  consultation 
  with 
  

   Dr. 
  Harris, 
  his 
  opinion, 
  in 
  which 
  I 
  am 
  now 
  happy 
  to 
  coincide, 
  is, 
  that 
  if 
  the 
  genera 
  are 
  

   united, 
  the 
  choice 
  of 
  names 
  should 
  be 
  restricted 
  to 
  Ectinus 
  or 
  Agriotcs, 
  since 
  Latreille 
  

   has 
  united 
  the 
  other 
  two 
  (Dolopius 
  and 
  Sericosomus) 
  with 
  them. 
  

  

  