﻿OBSERVATIONS 
  ON 
  THE 
  ASTACID.^ 
  IN 
  THE 
  UNITED 
  

   STATES 
  NATIONAL 
  MUSEUM 
  AND 
  IN 
  THE 
  MUSEUM 
  OF 
  

   COMPAKATIVE 
  ZOOLOGY, 
  WITH 
  DESCRIPTIONS 
  OF 
  NEW 
  

   SPECIES. 
  

  

  By 
  Walter 
  Faxon, 
  

  

  Assistant 
  in 
  charge 
  of 
  MoUnsca 
  and 
  Crwitacea. 
  Museum 
  of 
  Comparative 
  Zoolotjn, 
  

   Cambridge, 
  Massachusetts. 
  

  

  Since 
  the 
  publication 
  of 
  Diy 
  " 
  Notes 
  on 
  North 
  American 
  Crayfishes" 
  

   in 
  1800, 
  a 
  good 
  deal 
  of 
  material 
  has 
  accumulated 
  in 
  the 
  United 
  States 
  

   National 
  ^Museum 
  and 
  in 
  the 
  Museum 
  of 
  Comparative 
  Zoology. 
  Tlie 
  

   first 
  part 
  of 
  the 
  jiresent 
  article 
  embodies 
  the 
  results 
  of 
  an 
  examination 
  

   of 
  this 
  material.' 
  

  

  The 
  second 
  i>art 
  relates 
  to 
  the 
  crayfishes 
  of 
  the 
  Southern 
  Hemi- 
  

   s])here 
  — 
  the 
  Farastacinw. 
  After 
  the 
  publication 
  of 
  Part 
  I 
  of 
  my 
  

   "Revision 
  of 
  the 
  Astacidip," 
  which 
  treated 
  of 
  the 
  Northern 
  Hemi- 
  

   sphere 
  genera, 
  Camharus 
  and 
  Astacms, 
  I 
  hoped 
  to 
  get 
  together 
  a 
  col- 
  

   lection 
  of 
  the 
  Parastacine 
  crayfishes 
  that 
  wonld 
  enable 
  me 
  to 
  issue 
  the 
  

   second 
  i)art 
  of 
  the 
  revision 
  in 
  a 
  shape 
  similar 
  to 
  the 
  first 
  part. 
  Disap- 
  

   pointed 
  in 
  this 
  hope, 
  I 
  have 
  decided 
  to 
  include 
  in 
  this 
  paper 
  such 
  results 
  

   as 
  I 
  could 
  obtain 
  from 
  a 
  study 
  of 
  the 
  Parastacin(e 
  in 
  the 
  two 
  museums 
  

   above 
  named. 
  Thanks 
  to 
  Mr. 
  Charles 
  C. 
  Chilton, 
  of 
  Christeliurch, 
  

   New 
  Zealand, 
  my 
  series 
  of 
  New 
  Zealand 
  crayfishes 
  is 
  ample, 
  but 
  lack 
  

   of 
  adequate 
  material 
  from 
  Australia, 
  Tasmania, 
  and 
  South 
  America 
  

   precludes 
  a 
  satisfactory 
  revision 
  of 
  the 
  Parastacincv 
  as 
  a 
  whole. 
  

  

  Six 
  new 
  species 
  and 
  three 
  new 
  subspecies 
  of 
  Cambarus 
  are 
  described 
  

   and 
  figured 
  in 
  this 
  paper. 
  Of 
  these, 
  five 
  belong 
  to 
  the 
  United 
  States, 
  

   four 
  to 
  Mexico. 
  Five 
  new 
  species 
  of 
  Parastacus 
  are 
  also 
  described 
  and 
  

   figured 
  — 
  two 
  from 
  Uruguay, 
  two 
  from 
  Chile, 
  and 
  one 
  ostensibly 
  from 
  

   Mexico. 
  

  

  'Anyone 
  who 
  undertakes 
  the 
  perpk'xin<>- 
  study 
  of 
  the 
  Xorth 
  American 
  crayfishes 
  

   should 
  have 
  at 
  hand 
  the 
  foUowing 
  works: 
  1. 
  Monograph 
  of 
  the 
  North 
  American 
  

   Astacid;e. 
  By 
  Hermann 
  A. 
  Hagen. 
  111. 
  Cat. 
  Mns. 
  Comp. 
  Zool., 
  No. 
  3 
  [Mem. 
  Mus. 
  

   Comp. 
  Zool., 
  II, 
  No. 
  1], 
  1871. 
  2. 
  A 
  Revision 
  of 
  the 
  Astacidje. 
  Parti. 
  The 
  Genera 
  

   Cambarus 
  and 
  Astacus. 
  By 
  Walter 
  Faxon. 
  Mem. 
  Mus. 
  Comp. 
  Zool., 
  X, 
  No. 
  4, 
  1885. 
  

   3. 
  Notes 
  on 
  North 
  American 
  Crayfishes 
  — 
  Family 
  Astacidic. 
  By 
  Walter 
  Faxon. 
  

   Proc. 
  U. 
  S. 
  Nat. 
  Mus., 
  XII, 
  pp. 
  619-634, 
  1890. 
  4. 
  The 
  present 
  article. 
  In 
  these 
  

   works 
  all 
  the 
  North 
  American 
  crayfishes 
  are 
  described 
  and 
  many 
  of 
  them 
  figured. 
  

  

  PROCEEDINGS 
  U- 
  S. 
  NATIONAL 
  MUSEUM, 
  VOL. 
  XX-NO. 
  1136. 
  

  

  643 
  

  

  