﻿NO. 
  1136. 
  OBSEllVAnoyS 
  ON 
  THE 
  ASTACIDJE—FAXOK. 
  649 
  

  

  CAMBARUS 
  MEXICANUS 
  Erichson. 
  

  

  Mirador 
  and 
  Santa 
  Maria, 
  Mexico 
  (Ooll. 
  U.S.lJ^'.M.). 
  The 
  annulns 
  vcn- 
  

   tralis 
  of 
  the 
  female 
  forms 
  a 
  prominent 
  tubercle, 
  with 
  perpendicular 
  

   posterior 
  wall, 
  facing 
  a 
  roundish 
  tubercle 
  arising 
  from 
  the 
  posterior 
  

   thoracic 
  segment. 
  The 
  anterior 
  and 
  ventral 
  sides 
  of 
  the 
  annulus 
  are 
  

   divided 
  by 
  a 
  longitudinal 
  groove 
  which 
  is 
  bounded 
  on 
  each 
  side 
  by 
  a 
  

   rather 
  prominent 
  lip.' 
  

  

  CAMBARUS 
  GRACILIS 
  Bundy. 
  

  

  Six 
  young 
  specimens 
  from 
  Day 
  Brook, 
  Jasper 
  County, 
  Missouri, 
  Miss 
  

   Ruth 
  Hoppiu, 
  probably 
  belong 
  to 
  this 
  species. 
  (No. 
  4341, 
  ]\rus. 
  Comp. 
  

   Zool.) 
  

  

  GROUP 
  III. 
  (Type, 
  Asiacus 
  harionnYa,hv'icmn.) 
  

  

  Third 
  segment 
  of 
  third 
  pair 
  of 
  legs 
  hooked. 
  First 
  i^air 
  of 
  abdomi- 
  

   nal 
  ai^peudages 
  of 
  male 
  thick, 
  the 
  inner 
  and 
  outer 
  parts 
  both 
  terminat- 
  

   ing 
  in 
  a 
  short 
  recurved 
  tooth. 
  

  

  CAMBARUS 
  BARTONII 
  (Fabricius). 
  

  

  North 
  Adams, 
  Berkshire 
  County, 
  Massachusetts 
  (Coll. 
  Mus. 
  Comp. 
  

   Zool.); 
  Westmoreland 
  County, 
  Pennsylvania; 
  Waynesville, 
  Haywood 
  

   County, 
  North 
  Carolina; 
  lioan 
  Mountain, 
  North 
  Caroliiui, 
  from 
  an 
  alti- 
  

   tude 
  of 
  6,000 
  feet 
  (J)octor 
  C. 
  H. 
  Merriam); 
  Warren 
  County, 
  Ohio; 
  

   Albany, 
  Clinton 
  County, 
  Kentucky; 
  Claiborne, 
  Monroe, 
  and 
  McMinn 
  

   Counties, 
  Tennessee 
  (Coll. 
  U.S.N.M.); 
  caves 
  in 
  Lawrence 
  and 
  Orange 
  

   Counties, 
  Indiana 
  (W. 
  P. 
  Hay, 
  Proc. 
  U. 
  S. 
  Nat. 
  Mus., 
  XVI, 
  1893, 
  p. 
  L>86). 
  

  

  CAMBARUS 
  BARTONII 
  ROBUSTUS 
  (Girard). 
  

  

  Oneida 
  Creek, 
  Peterboro, 
  Madison 
  County, 
  New 
  York, 
  C 
  S. 
  Miller, 
  

   jr. 
  (No. 
  4329, 
  Mus. 
  Comp. 
  Zool.). 
  According 
  to 
  Doctor 
  U. 
  W. 
  Shufeldt,- 
  

   Camharus 
  hartonii 
  robustus 
  in 
  Montgomery 
  County, 
  Maryland, 
  builds 
  

   mud 
  towers 
  at 
  the 
  mouth 
  of 
  its 
  burrow 
  similar 
  to 
  those 
  of 
  C. 
  diogenes. 
  

   A 
  figure 
  of 
  one 
  of 
  these 
  towers, 
  or 
  "chimneys," 
  from 
  a 
  photograph, 
  is 
  

   given 
  in 
  Shufeldt's 
  article. 
  

  

  CAMBARUS 
  BARTONII 
  LONGIROSTRIS 
  Faxon. 
  

  

  Two 
  males 
  and 
  one 
  female 
  from 
  Will's 
  Creek, 
  Pollard, 
  Escambia 
  

   County, 
  Alabama 
  (Coll. 
  U.S.N.M.). 
  The 
  suborbital 
  angle 
  is 
  sharply 
  

  

  ' 
  In 
  the 
  artificial 
  key 
  to 
  the 
  species 
  of 
  Group 
  II 
  on 
  p. 
  48 
  of 
  my 
  ''Revision 
  of 
  the 
  

   Astacidte," 
  C. 
  mcxicanus 
  is 
  distinguished 
  from 
  C. 
  simidaiis 
  by 
  the 
  moderate 
  width 
  of 
  

   the 
  areola 
  contrasted 
  with 
  the 
  narrow 
  areola 
  of 
  C. 
  simulans. 
  In 
  fact, 
  the 
  areola 
  is 
  

   very 
  narrow 
  in 
  both 
  species 
  (it 
  is 
  too 
  broad 
  in 
  the 
  figure 
  of 
  C, 
  simulans 
  on 
  pi. 
  i 
  of 
  

   the 
  "Revision"). 
  The 
  distinction 
  should 
  have 
  been 
  drawn 
  from 
  the 
  rostrum 
  and 
  

   cheliP. 
  The 
  rostrum 
  is 
  nearlj- 
  plane 
  above 
  in 
  ('. 
  incxkamis, 
  deeply 
  hollowed 
  out 
  in 
  

   ('. 
  simulans; 
  the 
  chela 
  is 
  much 
  narrower, 
  and 
  more 
  heavily 
  and 
  closely 
  tuberculated 
  

   iu 
  C. 
  mexivanus 
  than 
  in 
  the 
  latter 
  species. 
  

  

  ^The 
  Observer, 
  VII, 
  No. 
  3, 
  p. 
  88, 
  March, 
  1890. 
  

  

  