﻿658 
  I'ROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  

  

  process 
  ofepistome 
  blunt 
  at 
  the 
  auterior 
  eiul, 
  the 
  sides 
  convex, 
  the 
  lat- 
  

   eral 
  angles 
  protuberant. 
  Carpus 
  armed 
  with 
  a 
  large 
  median 
  and 
  a 
  

   small 
  posterior 
  spine 
  on 
  the 
  inner 
  border; 
  below, 
  the 
  carpus 
  presents 
  

   a 
  prominent 
  median 
  spine 
  together 
  with 
  a 
  smaller 
  one 
  situated 
  between 
  

   the 
  latter 
  and 
  the 
  median 
  internal 
  spine. 
  The 
  chela 
  is 
  of 
  moderate 
  

   size, 
  punctate, 
  doubly 
  serrate 
  on 
  the 
  internal 
  border, 
  fingers 
  armed 
  

   with 
  blunt 
  teeth 
  along 
  their 
  prehensile 
  edges, 
  the 
  base 
  of 
  the 
  immo- 
  

   bile 
  fingers 
  commonly 
  beared 
  within; 
  dactylus 
  about 
  twice 
  as 
  long 
  as 
  

   the 
  inner 
  margin 
  of 
  the 
  palms. 
  Antennal 
  scale 
  broad, 
  broadest 
  beyond 
  

   the 
  middle, 
  internal 
  margin 
  very 
  convex. 
  

  

  First 
  pair 
  of 
  abdominal 
  appendages 
  of 
  the 
  male 
  similar 
  to 
  those 
  of 
  

   C. 
  palmeri. 
  

  

  Annulus 
  ventralis 
  of 
  the 
  female 
  triangular, 
  central 
  cavity 
  roundish, 
  

   not 
  elongated 
  transversely, 
  posterior 
  wall 
  much 
  swollen 
  and 
  divided 
  in 
  

   the 
  middle 
  by 
  an 
  almost 
  straight, 
  longitudinal 
  closed 
  fissure. 
  

  

  Length 
  59 
  mm.; 
  carax)ace 
  29 
  mm.; 
  rostrum 
  7 
  mm.; 
  from 
  tip 
  of 
  rostrum 
  

   to 
  cervical 
  groove 
  18.5 
  mm.; 
  from 
  cervical 
  groove 
  to 
  posterior 
  margin 
  

   of 
  carapace 
  10.3 
  mm. 
  ; 
  cheliped 
  40 
  mm. 
  ; 
  merus 
  11.5 
  mm. 
  ; 
  carpus 
  7 
  mm. 
  ; 
  

   chela 
  22.5 
  mm.; 
  dactylus 
  15 
  mm. 
  

  

  Walnut 
  Fork, 
  Piuey, 
  Arkansas 
  (Coll. 
  Mus. 
  Comp. 
  Zool., 
  from 
  S. 
  E. 
  

   Meek.). 
  Twelve 
  males. 
  Form 
  11; 
  fifteen 
  females. 
  

  

  Fayetteville, 
  Arkansas 
  (Coll. 
  S. 
  E. 
  Meek.). 
  One 
  male, 
  Form 
  1 
  ; 
  seven 
  

   males. 
  Form 
  II 
  ; 
  five 
  females. 
  

  

  This 
  small 
  species, 
  discovered 
  in 
  northwestern 
  Arkansas 
  by 
  Professor 
  

   S. 
  E. 
  Meek, 
  appears 
  to 
  be 
  distinct 
  from 
  any 
  hitherto 
  described. 
  In 
  its 
  

   general 
  appearance 
  it 
  resembles 
  C. 
  rusticiis, 
  but 
  the 
  areola 
  is 
  much 
  

   narrower, 
  as 
  in 
  C. 
  virilis, 
  while 
  the 
  male 
  appendages 
  are 
  fashioned 
  like 
  

   those 
  of 
  G. 
  lialmerl. 
  The 
  first 
  pair 
  of 
  abdominal 
  appendages 
  of 
  the 
  

   female 
  are 
  reduced 
  to 
  the 
  merest 
  rudiments 
  in 
  the 
  shape 
  of 
  a 
  pair 
  of 
  

   soft 
  papillfe 
  springing 
  from 
  the 
  first 
  sternal 
  segment 
  of 
  the 
  abdomen. 
  

  

  CAMBARUS 
  RUSTICUS 
  Girard. 
  

  

  Grand 
  Rapids, 
  Wood 
  County, 
  Ohio; 
  Defiance, 
  Defiance 
  County, 
  Ohio; 
  

   Ottawa, 
  Putnam 
  County, 
  Ohio; 
  McCutcheuville, 
  Wyandot 
  County, 
  

   Ohio; 
  TifQn, 
  Seneca 
  County, 
  Ohio 
  ; 
  Waterloo, 
  Indiana; 
  Moscow, 
  Hick 
  

   man 
  County, 
  Kentucky; 
  Saginaw 
  and 
  Tiffin, 
  Michigan; 
  Springfield 
  

   and 
  Marsh 
  field, 
  Missouri. 
  (Coll. 
  U.S.KM.) 
  Black 
  River, 
  Black 
  Rock, 
  

   Arkansas; 
  Shell 
  Rock 
  River, 
  Waverley, 
  Iowa; 
  Indian 
  Creek, 
  Marion, 
  

   Iowa. 
  (Coll. 
  S.E. 
  Meek.) 
  

  

  CAMBARUS 
  SPINOSUS 
  Bundy. 
  

  

  Indian 
  Creek, 
  tributary 
  of 
  Powell's 
  River, 
  six 
  miles 
  southeast 
  of 
  Cum- 
  

   berland 
  Cap, 
  Tennessee; 
  Clinch 
  River 
  at 
  Walker's 
  Ford, 
  eleven 
  miles 
  

   sou 
  thwestof 
  Tazewell, 
  Tennessee; 
  Courtland, 
  Alabama. 
  (Coll.U.S.N.M.) 
  

  

  The 
  specimens 
  from 
  Courtland, 
  Alabama, 
  are 
  three 
  females 
  and 
  one 
  

  

  