﻿<Hisi:i.'IATIOXS 
  ox 
  THE 
  ASTACIDJE— 
  FAXON. 
  G61 
  

  

  more 
  strongly 
  developed; 
  the 
  postorbital 
  ridges 
  bear 
  distinct 
  anteiior 
  

   s])ines; 
  the 
  hand 
  is 
  broader 
  and 
  more 
  hirsute, 
  and 
  the 
  fingers 
  are 
  

   tipped 
  with 
  more 
  conspicuous, 
  yellow, 
  corneous 
  uails. 
  

  

  Length 
  ?}^ 
  mm. 
  

  

  State 
  ofGuauajuato, 
  Mexico, 
  A. 
  Duges 
  (No. 
  16087, 
  U.S.N.M.). 
  

  

  CAMBARUS 
  MONTEZUMiE 
  AREOLATUS 
  Faxon. 
  

  

  (Plate.LXVI, 
  fig. 
  2.j 
  

   Camharns 
  monfezuma% 
  var. 
  areolata 
  Faxon, 
  Rev. 
  Astaci<lfie, 
  Pt. 
  1, 
  1885, 
  p. 
  12,3. 
  

  

  lu 
  this 
  form 
  the 
  outline 
  of 
  the 
  rostrum 
  is 
  similar 
  to 
  that 
  of 
  C. 
  m. 
  

   dugesii, 
  but 
  the 
  lateral 
  margins 
  are 
  not 
  .raised 
  so 
  as 
  to 
  form 
  prominent 
  

   cariujv. 
  The 
  lateral 
  rostral 
  spines 
  and 
  the 
  spines 
  at 
  the 
  anterior 
  end 
  

   of 
  the 
  postorbital 
  ridges 
  are 
  developed 
  to 
  about 
  the 
  same 
  degree 
  as 
  

   in 
  C. 
  m. 
  fhigesii. 
  The 
  characteristic 
  feature 
  of 
  this 
  form 
  is 
  the 
  short- 
  

   ness 
  of 
  the 
  posterior 
  section 
  of 
  the 
  carapace, 
  which 
  involves 
  a 
  very 
  

   short 
  and 
  broad 
  areola. 
  

  

  Parras, 
  Coahuila, 
  Mexico, 
  Edward 
  Palmer 
  (No. 
  3C50, 
  Mus. 
  Com 
  p. 
  

   Zool.). 
  

  

  CAMBARUS 
  MONTEZUMiE 
  OCCIDENTALIS, 
  new 
  subspecies. 
  

  

  (Plate 
  LXVI, 
  iigs. 
  3, 
  4.) 
  

  

  Camharus 
  montc7uma' 
  FAXiys 
  (pars), 
  Rev. 
  AstaciiLr, 
  Pt. 
  1, 
  1885, 
  p. 
  123. 
  

  

  Rostrum 
  plane 
  above, 
  margins 
  but 
  very 
  slightly 
  raised, 
  tapering 
  grad- 
  

   ually 
  from 
  the 
  base 
  to 
  the 
  tip 
  without 
  distinct 
  lateral 
  spines 
  or 
  defi- 
  

   nitely 
  limited 
  acumen. 
  It 
  reaches 
  at 
  the 
  most 
  to 
  the 
  distal 
  end 
  of 
  the 
  

   second 
  antennular 
  segment. 
  Postorbital 
  ridges 
  unarmed. 
  

  

  Mazatlan, 
  Mexico 
  (No. 
  3052, 
  Mus. 
  Comp. 
  Zool.). 
  

  

  CAMBARUS 
  CHAPALANUS, 
  new 
  species. 
  

   (PlateLXVII, 
  fio-8. 
  1, 
  2.) 
  

  

  Similar 
  to 
  C. 
  m 
  on 
  tesnma\ 
  hut 
  diflers 
  in 
  the 
  following 
  regards: 
  Body 
  

   slenderer 
  and 
  more 
  cylindrical; 
  rostrum 
  much 
  longer 
  and 
  narrowei-, 
  

   reaching 
  to 
  the 
  end 
  of 
  the 
  antennular 
  peduncle, 
  somewhat 
  hirsute, 
  

   armed 
  with 
  a 
  pair 
  of 
  stout 
  and 
  sharp 
  lateral 
  spines, 
  and 
  a 
  long 
  spiui- 
  

   form 
  acumen; 
  jiostorbital 
  ridges 
  terminating 
  anteriorly 
  in 
  long 
  and 
  

   strong 
  s])iniform 
  teeth; 
  antennal 
  scales 
  mucli 
  longer 
  and 
  narrower 
  and 
  

   armed 
  with 
  a 
  much 
  longer 
  apical 
  spine. 
  

  

  Type, 
  — 
  Lake 
  Chapala, 
  State 
  of 
  Jalisco, 
  Mexico, 
  P. 
  L. 
  Jouy 
  (No. 
  17G9S, 
  

   U.S.N.M.). 
  One 
  male. 
  

  

  Same 
  locality 
  and 
  collector 
  (No. 
  1G294, 
  TJ.S.N.M.). 
  Three 
  males. 
  

  

  The 
  upper 
  surface 
  of 
  the 
  rostrum 
  is 
  plane, 
  with 
  raised 
  lateral 
  mar- 
  

   gins. 
  The 
  sides 
  of 
  the 
  rostrum 
  are 
  convex, 
  distinctly 
  converging 
  

   before 
  attaining 
  to 
  the 
  lateral 
  spines. 
  The 
  chelipeds 
  and 
  the 
  male 
  

   sexual 
  organs 
  are 
  like 
  those 
  of 
  the 
  typical 
  form 
  of 
  C. 
  montezuviw. 
  

  

  