﻿224 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.98 
  

  

  I 
  wish 
  to 
  express 
  my 
  appreciation 
  to 
  Mr. 
  Hcdgpeth, 
  in 
  whose 
  honor 
  

   this 
  species 
  is 
  named, 
  for 
  obtaining 
  additional 
  specimens 
  for 
  me. 
  I 
  

   also 
  wish 
  to 
  thank 
  Dr. 
  Waldo 
  L. 
  Schmitt 
  and 
  Dr. 
  Fenner 
  A. 
  Chace, 
  

   Jr., 
  both 
  of 
  the 
  United 
  States 
  National 
  Museum, 
  for 
  their 
  kindness 
  in 
  

   mailing 
  the 
  Museum 
  collection 
  accessible 
  and 
  for 
  checking 
  the 
  manu- 
  

   script 
  of 
  this 
  paper. 
  

  

  Genus 
  CAMBARUS 
  Erichson. 
  1846 
  

  

  CAMBARUS 
  HEDGPETHI, 
  new 
  species 
  

   FiGUItE 
  17 
  

  

  Cambarus 
  argilUcola 
  Faxon, 
  1884, 
  p. 
  116, 
  in 
  part, 
  p. 
  144, 
  in 
  part; 
  1885, 
  p. 
  77, 
  

   in 
  part; 
  1898, 
  p. 
  650, 
  in 
  part; 
  1914, 
  p. 
  400, 
  in 
  part.— 
  Harris, 
  1903, 
  p. 
  59, 
  

   in 
  part, 
  p. 
  71, 
  in 
  part, 
  p. 
  137, 
  in 
  part, 
  p. 
  158, 
  in 
  part, 
  pp. 
  144, 
  150, 
  153, 
  in 
  part, 
  

   pi. 
  3, 
  in 
  part.— 
  Hay, 
  1899, 
  p. 
  959, 
  in 
  part.— 
  (?) 
  Lyue, 
  1938, 
  p. 
  76.— 
  Ortmann, 
  

   1902, 
  p. 
  280; 
  1905, 
  p. 
  123, 
  in 
  part, 
  p. 
  136, 
  in 
  part.— 
  Turner, 
  1926, 
  p. 
  187, 
  in 
  

   part). 
  

  

  Cambarus 
  fodiens 
  Creaser, 
  1931, 
  p. 
  269, 
  in 
  part 
  ; 
  1932, 
  p. 
  336, 
  in 
  part. 
  — 
  Penn, 
  1941, 
  

   p. 
  8. 
  

  

  Diagnosis. 
  — 
  Rostrum 
  without 
  lateral 
  spines; 
  areola 
  obliterated 
  in 
  

   middle; 
  chela 
  stronglj'^ 
  depressed 
  with 
  a 
  prominent 
  tuft 
  of 
  plumose 
  

   setae 
  along 
  base 
  of 
  opposable 
  margin 
  of 
  immovable 
  finger; 
  mesial 
  

   process 
  of 
  first 
  pleopod 
  of 
  first-form 
  male 
  so 
  grooved 
  as 
  to 
  appear 
  

   slightly 
  twisted. 
  It 
  may 
  be 
  readily 
  distinguished 
  from 
  its 
  closest 
  

   relatives, 
  C. 
  hyersi 
  Hobbs 
  (1941, 
  p. 
  118) 
  and 
  G. 
  fodiens., 
  as 
  follows: 
  

   In 
  G. 
  hyersi 
  there 
  is 
  no 
  tuft 
  of 
  setae 
  along 
  the 
  base 
  of 
  the 
  opposable 
  

   margin 
  of 
  immovable 
  finger; 
  however, 
  there 
  is 
  a 
  row 
  of 
  long 
  setae 
  

   along 
  the 
  outer 
  lower 
  surface 
  of 
  the 
  hand 
  which 
  is 
  not 
  present 
  in 
  

   G. 
  hedgpethi. 
  In 
  C. 
  fodiens 
  there 
  is 
  a 
  single 
  major 
  tubercle 
  on 
  op- 
  

   posable 
  margin 
  of 
  immovable 
  finger, 
  and 
  in 
  G. 
  hedgpethi 
  there 
  are 
  two 
  

   major 
  tubercles. 
  

  

  Holotypic 
  male., 
  form 
  I. 
  — 
  Body 
  subcylindrical. 
  Abdomen 
  narrower 
  

   than 
  thorax 
  (11.1-13.4 
  mm. 
  in 
  widest 
  parts, 
  respectively). 
  

  

  Width 
  of 
  carapace 
  slightly 
  greater 
  than 
  depth 
  in 
  region 
  of 
  caudo- 
  

   dorsal 
  margin 
  of 
  cervical 
  groove 
  (13.1-12.9 
  mm.). 
  Greatest 
  width 
  

   of 
  carapace 
  slightly 
  caudad 
  of 
  caudodorsal 
  margin 
  of 
  cervical 
  groove 
  

   (13.4 
  mm.). 
  

  

  Areola 
  obliterated 
  in 
  middle; 
  cephalic 
  section 
  of 
  carapace 
  about 
  1.5 
  

   times 
  as 
  long 
  as 
  areola 
  (length 
  of 
  areola 
  about 
  40 
  percent 
  of 
  entire 
  

   length 
  of 
  carapace) 
  . 
  

  

  Rostrum 
  directed 
  cephaloventrad 
  ; 
  upper 
  surface 
  deeply 
  excavate 
  

   cephalad; 
  margins 
  converge 
  gently 
  from 
  base 
  and 
  turn 
  somewhat 
  

   abruptly 
  mesiad 
  at 
  base 
  of 
  acumen 
  ; 
  acumen 
  not 
  distinctly 
  set 
  off 
  from 
  

   rest 
  of 
  rostrum; 
  no 
  lateral 
  spines 
  present; 
  tip 
  of 
  rostrum 
  bears 
  an 
  

   acute 
  upturned 
  tubercle 
  and 
  extends 
  to 
  distal 
  end 
  of 
  penultimate 
  seg- 
  

   ment 
  of 
  peduncle 
  of 
  antennule. 
  Sparsely 
  punctate 
  above 
  at 
  base 
  and 
  

  

  