﻿OF 
  THE 
  UNITED 
  STATES. 
  483 
  

  

  Two 
  specimens 
  found 
  on 
  the 
  Gila 
  River, 
  New 
  Mexico. 
  This 
  is 
  a 
  moderately 
  stout 
  spe- 
  

   cies, 
  intermediate 
  in 
  form 
  between 
  the 
  slender 
  M. 
  vespertinus 
  and 
  the 
  other 
  species 
  of 
  

   this 
  group: 
  the 
  oblique 
  side 
  of 
  the 
  last 
  triangular 
  joint 
  of 
  the 
  palpi 
  is 
  straight, 
  so 
  that 
  

   those 
  organs 
  appear 
  more 
  acute 
  at 
  the 
  tip 
  than 
  in 
  the 
  other 
  species. 
  

  

  5. 
  M. 
  vespertinus, 
  elongatus 
  infra 
  testaceus, 
  supra 
  fuscus, 
  cinereo-pubescens, 
  thorace 
  latitu- 
  

   dine 
  longiore, 
  punctulato, 
  vittis 
  duabus 
  dilatatis 
  nigro-fuscis, 
  seutello 
  testaceo, 
  elytris 
  vitta 
  discoidali 
  

   testacea, 
  pone 
  medium 
  sa?pissime 
  interrupta, 
  striis 
  obsolete 
  punctatis, 
  antennis 
  articulis 
  2 
  et 
  3 
  subrc- 
  

   qualibus. 
  Long. 
  "27 
  — 
  '40. 
  

  

  Dej. 
  Cat. 
  p. 
  98. 
  

  

  Mater 
  vespertinus 
  Fabr. 
  Syst. 
  El. 
  2, 
  240: 
  Herbst, 
  Kafer, 
  10, 
  131 
  : 
  Say, 
  Tr. 
  Am. 
  Ph. 
  Soc. 
  G, 
  177. 
  

  

  Elater 
  finilimus 
  Say, 
  Trans. 
  Am. 
  Phil. 
  Soc. 
  6, 
  179. 
  

  

  Monocrepidius 
  serotinus 
  Germ. 
  Zeitschr. 
  1, 
  227. 
  

  

  Middle 
  and 
  Southern 
  States. 
  Varies 
  very 
  much 
  both 
  in 
  size 
  and 
  colour: 
  the 
  thorax 
  is 
  

   occasionally 
  black, 
  with 
  a 
  narrow 
  margin 
  and 
  vitta 
  testaceous: 
  the 
  type 
  with 
  the 
  elytral 
  

   vitta 
  entire 
  and 
  uniform 
  is 
  rare; 
  the 
  only 
  specimen 
  I 
  have 
  seen 
  was 
  given 
  me 
  by 
  Mr. 
  

   Guex: 
  the 
  vitta 
  is 
  sometimes 
  reduced 
  to 
  a 
  small 
  humeral 
  spot, 
  one 
  about 
  the 
  middle, 
  and 
  

   a 
  less 
  distinct 
  one 
  towards 
  the 
  tip. 
  The 
  thorax 
  is 
  longer, 
  less 
  narrowed 
  in 
  front, 
  and 
  

   much 
  less 
  rounded 
  on 
  the 
  sides 
  in 
  the 
  male 
  than 
  in 
  the 
  female: 
  in 
  both 
  sexes 
  the 
  posterior 
  

   angles 
  are 
  slightly 
  divergent. 
  El. 
  finitimus 
  Say, 
  from 
  a 
  type 
  in 
  Dr. 
  Harris' 
  collection, 
  is 
  

   a 
  dark 
  variety 
  of 
  this 
  species. 
  

  

  6. 
  M. 
  auritus, 
  crassiusculus, 
  fuscus, 
  subtiliter 
  pubescens, 
  thorace 
  convexo, 
  ante 
  medium 
  angus- 
  

   tato, 
  angulis 
  posticis 
  vix 
  divergentibus, 
  confertim 
  punctato, 
  testaceo, 
  nigro-bimaculato, 
  (saspe 
  nigro, 
  

   angulis 
  posticis 
  vittaque 
  obsolete 
  rufo-testaceis,) 
  seutello 
  ssepe 
  testaceo, 
  elytris 
  macula 
  utrinque 
  basali, 
  

   (ad 
  medium 
  stepe 
  extensa,) 
  alteraque 
  apicali 
  rufo-testaceis, 
  (srepe 
  obsoletis,) 
  striis 
  antice 
  punctatis, 
  inter- 
  

   stitiis 
  subtilissime 
  punctulatis, 
  pedibus 
  testaceis, 
  antennis 
  basi 
  pallidioribus, 
  articulis 
  2 
  et 
  3 
  subjequa- 
  

   libus, 
  4 
  t0 
  coniunctis 
  longioribus. 
  Long. 
  - 
  2 
  — 
  -29. 
  

  

  Germ. 
  Zeitschr. 
  5, 
  148, 
  190. 
  

  

  Elater 
  auritus 
  Herbst, 
  Kafer, 
  10, 
  145. 
  

  

  Oophorus 
  crassicollis 
  Melsheimer, 
  Proc. 
  Acad. 
  Nat. 
  Sc. 
  2, 
  214. 
  

  

  New 
  York, 
  Georgia, 
  Missouri 
  Territory, 
  Lake 
  Superior. 
  Extremely 
  variable 
  in 
  colour; 
  

   some 
  specimens 
  being 
  testaceous 
  above, 
  with 
  merely 
  the 
  head, 
  margin 
  of 
  the 
  elytra, 
  and 
  

   narrow 
  posterior 
  fascia 
  blackish, 
  while 
  others 
  are 
  entirely 
  black; 
  these 
  pass 
  insensibly 
  

   into 
  each 
  other, 
  so 
  that 
  no 
  well 
  defined 
  varieties 
  can 
  be 
  separated. 
  In 
  Melsheimer's 
  ca- 
  

   talogue 
  of 
  described 
  Coleoptera 
  of 
  the 
  United 
  States, 
  his 
  O. 
  crassicollis 
  is 
  erroneously 
  

   placed 
  under 
  Cryptohypnus, 
  but 
  on 
  inspecting 
  the 
  typical 
  specimen 
  I 
  found 
  the 
  tarsal 
  lobe 
  

   very 
  distinct. 
  The 
  male 
  differs 
  from 
  the 
  female 
  by 
  the 
  thorax 
  being 
  longer 
  and 
  less 
  

   rounded 
  on 
  the 
  sides. 
  

  

  7. 
  M. 
  Mandulus, 
  modice 
  elongatus, 
  parce 
  flavo-pubescens, 
  fuscus, 
  thorace 
  testaceo, 
  fusco 
  bivit- 
  

   tato, 
  latitudine 
  longiore, 
  a 
  basi 
  antrorsum 
  angustato, 
  lateribus 
  vix 
  rotundatis, 
  punctis 
  minutis 
  et 
  mai- 
  

   oribus 
  intermixtis 
  sat 
  dense 
  punctato, 
  elytris 
  testaceis 
  postice 
  gradatim 
  angustatis, 
  margine 
  suturaque 
  

   postice 
  latiore 
  fuscis, 
  striis 
  antice 
  valde 
  punctatis, 
  interstitiis 
  convexis, 
  vix 
  subtiliter 
  punctulatis, 
  pe- 
  

   dibus 
  antennisque 
  flavis, 
  his 
  articulis 
  2 
  et 
  3 
  sequalibus, 
  coniunctis 
  4 
  to 
  longioribus. 
  Long. 
  -19. 
  

  

  One 
  male 
  specimen, 
  Georgia. 
  Intermediate 
  in 
  form 
  between 
  M. 
  vespertinus 
  and 
  M. 
  

  

  