﻿OF 
  THE 
  UNITED 
  STATES. 
  481 
  

  

  gulata, 
  thorace 
  minus 
  convexo, 
  antrorsum 
  valde 
  angustato, 
  lateribus 
  rotundatis, 
  (vel 
  potius 
  ad 
  medium 
  

   obsolete 
  angulatis,) 
  carina 
  angulari 
  elongata, 
  minus 
  dense 
  sat 
  grosse 
  punctato, 
  elytris 
  a 
  basi 
  angusta- 
  

   tis, 
  parce 
  subtilius 
  punctatis, 
  striis 
  internis 
  obliteratis, 
  antennis 
  pedibusque 
  rufis, 
  1111s 
  avticulo 
  2 
  nd0 
  

   3 
  10,ue 
  ffiqualibus. 
  Long. 
  *6. 
  

  

  Melanotus 
  paradoxus 
  Melsheimer, 
  Proc. 
  Acad. 
  Nat. 
  Sc. 
  2, 
  lo2. 
  

  

  One 
  specimen 
  from 
  Pennsylvania, 
  in 
  Dr. 
  Melsheimer's 
  collection. 
  The 
  sides 
  of 
  the 
  

   thorax 
  are 
  so 
  obtusely 
  angulated, 
  that 
  they 
  may 
  almost 
  bo 
  called 
  rounded: 
  the 
  outer 
  

   striae 
  of 
  the 
  elytra 
  are 
  punctured 
  and 
  slightly 
  impressed: 
  the 
  inner 
  ones 
  are 
  reduced 
  to 
  

   small 
  punctures, 
  which 
  are 
  confused 
  with 
  those 
  belonging 
  to 
  the 
  interstices; 
  the 
  thorax 
  

   has 
  a 
  very 
  slight 
  and 
  short 
  impression 
  at 
  the 
  middle 
  of 
  the 
  base. 
  This 
  species 
  agrees 
  ac- 
  

   curately 
  with 
  C. 
  prolix 
  us 
  Er. 
  (Germ. 
  Zeitschr. 
  3, 
  94) 
  from 
  Mexico, 
  except 
  that 
  the 
  

   breast 
  and 
  abdomen 
  are 
  not 
  castaneous. 
  

  

  Besides 
  these, 
  there 
  are 
  described 
  as 
  occurring 
  in 
  North 
  America, 
  the 
  following 
  species, 
  

   which 
  I 
  do 
  not 
  possess, 
  or 
  cannot 
  identify 
  with 
  certainty. 
  

  

  C. 
  castanipes 
  Er. 
  Germ. 
  Zeitschr. 
  3, 
  95. 
  Periniecus 
  fulvipes 
  Kirby, 
  Fauna 
  Bor. 
  Am. 
  143. 
  

   C. 
  spadix 
  Er. 
  Germ. 
  Zeitschr. 
  3, 
  103. 
  ? 
  0. 
  cuneatus 
  Lee. 
  

   C. 
  abdominalis 
  Er. 
  Germ. 
  Zeitschr. 
  3, 
  104. 
  

   C. 
  vetulus 
  Er. 
  Germ. 
  Zeitschr. 
  3, 
  105. 
  

   Perimecus 
  s 
  i 
  m 
  i 
  1 
  i 
  s 
  Kirby, 
  Fauna 
  Bor. 
  Am. 
  149. 
  

  

  Monocrepidius 
  Escli. 
  [emend.') 
  

   Frons 
  paulo 
  convexa, 
  antice 
  rotundatini 
  marginata, 
  margine 
  prominulo: 
  mandibular 
  par 
  vie, 
  apice 
  

   subemarginatie: 
  palpi 
  articulo 
  ultimo 
  triangulari, 
  oblique 
  truncate-, 
  acuto: 
  antennas 
  parum 
  serratie, 
  

   articulo 
  primo 
  elongato, 
  2 
  et 
  3 
  sequentibus 
  angustioribus, 
  4 
  l 
  ° 
  coniunctis 
  longioribus: 
  prosternum 
  an- 
  

   tice 
  lobatum, 
  mucrone 
  postice 
  non 
  inflexo, 
  sutura 
  laterali 
  recta, 
  antice 
  haud, 
  vel 
  vix 
  excavata 
  : 
  meso- 
  

   sternum 
  non 
  protuberans: 
  coxie 
  posticie 
  laminis 
  iutus 
  subito 
  modice 
  dilatatis, 
  dente 
  interno 
  magno, 
  

   rotundato: 
  tarsi 
  pubescentes, 
  articulo 
  l" 
  10 
  sequentibus 
  duobus 
  lequali, 
  4 
  10 
  subtus 
  sa;pe 
  lobato, 
  in 
  (C.) 
  

   autem 
  simplici: 
  5 
  10 
  longiore, 
  unguiculis 
  integris. 
  

  

  In 
  this 
  genus 
  I 
  include 
  several 
  species, 
  placed 
  by 
  Germar 
  in 
  his 
  second 
  division 
  of 
  

   Cryptohypnus, 
  with 
  which 
  they 
  have 
  very 
  little 
  relation 
  ; 
  they 
  accord 
  nearly 
  with 
  Elater, 
  

   and 
  seem 
  to 
  differ 
  only 
  in 
  having 
  the 
  front 
  less 
  convex 
  and 
  not 
  angulated, 
  the 
  first 
  joint 
  

   of 
  the 
  antennae 
  elongated, 
  and 
  the 
  internal 
  tooth 
  of 
  the 
  posterior 
  coxa? 
  rounded. 
  I 
  was 
  at 
  

   first 
  inclined 
  to 
  consider 
  the 
  species 
  like 
  El.dorsalis, 
  in 
  which 
  the 
  tarsi 
  are 
  not 
  lobed, 
  as 
  a 
  

   distinct 
  genus; 
  but 
  finding 
  no 
  other 
  difference, 
  and 
  seeing, 
  moreover, 
  that 
  in 
  the 
  species 
  

   with 
  lobed 
  tarsi, 
  there 
  is 
  no 
  constancy 
  in 
  the 
  form 
  of 
  the 
  prolongation, 
  it 
  appears 
  more 
  

   natural 
  to 
  consider 
  them 
  as 
  forming 
  one 
  natural 
  genus, 
  in 
  which, 
  as 
  in 
  many 
  others 
  

   of 
  this 
  tribe, 
  the 
  form 
  of 
  the 
  fourth 
  joint 
  of 
  the 
  tarsi 
  is 
  variable: 
  the 
  posterior 
  angles 
  of 
  

   the 
  thorax 
  are 
  carinate, 
  produced 
  and 
  sharp: 
  basal 
  fissures 
  none. 
  

  

  Our 
  species 
  may 
  be 
  grouped 
  as 
  follows 
  : 
  — 
  

  

  A. 
  Tarsi 
  articulo 
  4 
  t0 
  lobato, 
  lobo 
  valde 
  dilatato 
  - 
  - 
  - 
  - 
  Sp. 
  1 
  — 
  3. 
  

  

  B. 
  Tarsi 
  articulo 
  4 
  t0 
  lobato, 
  lobo 
  angusto, 
  (frons 
  convexior:) 
  - 
  - 
  Sp. 
  4—8. 
  

   0. 
  Tarsi 
  articulo 
  4 
  10 
  non 
  lobato, 
  (frons 
  convexior;) 
  - 
  - 
  - 
  Sp. 
  9 
  — 
  14. 
  

  

  