﻿420 
  REVISION 
  OF 
  THE 
  ELATEIIIIi 
  I 
  

  

  15. 
  Tarsi 
  articulo 
  T" 
  nee 
  htiore 
  nee 
  lobato. 
  

   I. 
  M. 
  humeralis, 
  opacus, 
  ater, 
  parce 
  fusco-pubescens, 
  thorace 
  Iatitudine 
  breviore, 
  lateribus 
  

   paralleli 
  umma 
  rotundatis, 
  angulis 
  po 
  ticia 
  subcarinatis, 
  liuea 
  marginali 
  dislocata, 
  confertim 
  

  

  i'0-punctato, 
  medio 
  utrinque 
  subfoveato, 
  elytris 
  fere 
  parallelis 
  aplce 
  obtusis 
  coniluenter 
  scabro- 
  

   punctatis, 
  i 
  bsolete 
  striatis, 
  basi 
  late 
  rufescentibus, 
  pedibus 
  antennisque 
  rufis, 
  his 
  articulo 
  3 
  10 
  non 
  an- 
  

   gustiore. 
  Long. 
  ■ 
  L5. 
  

   Lcc. 
  Proc. 
  Acad. 
  Nat. 
  Sc. 
  6, 
  I 
  . 
  

   Eucnem 
  '< 
  hum 
  ralis 
  Say, 
  Trans. 
  Am. 
  Phil. 
  Soc. 
  6, 
  189; 
  Harris, 
  Trans. 
  Hartford 
  Soc. 
  Nat. 
  Hist. 
  72. 
  

  

  Pennsylvania, 
  \h\ 
  Melsheimer; 
  Tennessee, 
  Dr. 
  Schaum. 
  Differs 
  from 
  all 
  the 
  preceding 
  

   species 
  by 
  the 
  third 
  joint 
  of 
  the 
  antenna 
  1 
  being 
  as 
  wide 
  as 
  the 
  fourth. 
  The 
  antenna? 
  in 
  

   both 
  specimens 
  arc 
  half 
  as 
  long 
  as 
  the 
  body, 
  compressed, 
  but 
  not 
  strongly 
  serrate: 
  the 
  

   two 
  discoidal 
  fovese 
  of 
  the 
  thorax 
  are 
  br< 
  ad, 
  but 
  not 
  deep; 
  there 
  is 
  also 
  a 
  trace 
  of 
  a 
  dorsal 
  

   impressed 
  line: 
  the 
  marginal 
  line 
  is 
  dislocated, 
  as 
  usual 
  ; 
  the 
  anterior 
  portion 
  is 
  very 
  short, 
  

   and 
  the 
  posterior 
  portion 
  extends 
  nearly 
  to 
  the 
  apex. 
  The 
  claws 
  of 
  the 
  tarsi 
  appear 
  to 
  

   be 
  indistinctly 
  toot 
  lie 
  I 
  at 
  the 
  middle. 
  

  

  This 
  species 
  seems 
  subject 
  to 
  variation 
  in 
  colour: 
  the 
  anterior 
  margin 
  of 
  the 
  thorax 
  and 
  

   the 
  posterior 
  angles 
  are 
  usually 
  tinged 
  with 
  rufous. 
  A 
  specimen 
  sent 
  by 
  Dr. 
  Schaum 
  has 
  

   the 
  elytra 
  entirely 
  black, 
  but 
  otherwise 
  seems 
  not 
  to 
  be 
  sufficiently 
  distinct. 
  

  

  Div. 
  3. 
  CEROPHYTIDES. 
  

  

  Although 
  differing 
  greatly 
  from 
  each 
  other, 
  there 
  is 
  such 
  a 
  close 
  accordance 
  in 
  some 
  

   characters 
  between 
  Cerophytum 
  and 
  Perothops 
  that 
  I 
  have 
  been 
  induced 
  to 
  place 
  them 
  

   together. 
  The 
  latter 
  genus 
  has 
  been 
  very 
  fully 
  examined 
  by 
  Erichson, 
  and 
  the 
  detail 
  of 
  

   his 
  observations 
  is 
  given 
  in 
  the 
  third 
  volume 
  of 
  Germar's 
  Zeitschrift. 
  He 
  has 
  placed 
  it 
  

   among 
  the 
  genuine 
  Elateridae, 
  considering 
  it 
  as 
  forming 
  a 
  transition 
  to 
  the 
  Cebrionida? 
  by 
  

   its 
  more 
  prominent 
  mandibles 
  and 
  cleft 
  ligula. 
  The 
  approximation 
  of 
  the 
  antenna?, 
  how- 
  

   ever, 
  brings 
  it 
  nearer 
  to 
  the 
  Eucnemides; 
  and 
  it 
  will 
  be 
  found, 
  on 
  comparison, 
  that 
  those 
  

   points 
  in 
  which 
  it 
  differs 
  from 
  the 
  Eucnemides 
  are 
  precisely 
  those 
  in 
  which 
  it 
  differs 
  from 
  

   the 
  true 
  Elaterides, 
  and 
  approaches 
  the 
  Cebrionides. 
  I 
  therefore 
  prefer 
  regarding 
  it 
  as 
  an 
  

   osculant 
  between 
  the 
  latter 
  family 
  and 
  the 
  Eucnemides, 
  and, 
  on 
  account 
  of 
  its 
  general 
  

   form, 
  and 
  the 
  structure 
  of 
  the 
  head, 
  to 
  be 
  placed 
  next 
  the 
  last 
  mentioned 
  division. 
  

   The 
  differences 
  between 
  Cerophytum 
  and 
  Perothops 
  are 
  as 
  follow: 
  

   The 
  front 
  of 
  Cerophytum 
  is 
  gibbous, 
  while 
  in 
  Perothops 
  it 
  is 
  only 
  deflexed 
  anteriorly. 
  

   The 
  mandibles 
  are 
  larger 
  and 
  more 
  prominent 
  in 
  Perothops: 
  the 
  prosternum 
  is 
  furnished 
  

   with 
  a 
  short 
  rounded 
  lobe 
  in 
  Cerophytum, 
  while 
  in 
  Perothops 
  it 
  is 
  nearly 
  truncate 
  ante- 
  

   riorly: 
  the 
  lateral 
  suture 
  is 
  curved 
  convexly 
  outwards 
  in 
  Cerophytum, 
  and 
  is 
  straight 
  in 
  

   Perothops: 
  the 
  lamina? 
  of 
  the 
  posterior 
  coxae 
  are 
  somewhat 
  suddenly 
  dilated 
  internally 
  in 
  

   Perothops, 
  and 
  are 
  entirely 
  obsolete 
  in 
  Cerophytum: 
  the 
  posterior 
  trochanters 
  are 
  very 
  long 
  

   in 
  Cerophytum, 
  and 
  moderate 
  in 
  Perothops: 
  the 
  tarsi 
  are 
  lobed 
  and 
  spongy 
  in 
  Cerophy- 
  

   tum, 
  with 
  the 
  first 
  joint 
  longer 
  and 
  the 
  fourth 
  joint 
  bilobed: 
  in 
  Perothops 
  the 
  joints 
  are 
  

   short, 
  diminish 
  very 
  gradually 
  in 
  length, 
  the 
  first 
  being 
  much 
  thicker, 
  and 
  are 
  very 
  densely 
  

   pubescent. 
  

  

  