NOTES ON NORTH AMERICAN CRAYFISHES— Family ASTACID^E. 



BY 



Walter Faxon. 



The following notes are the result of an examination of the North 

 American Astacidsfc received at the U. S. National Museum and the 

 Museum of Comparative Zoology and also those collected by the field 

 parties of the TJ. S. Fish Commission since the publication of the first 

 part of the author's revision of that group.* Herein are included full 

 descriptions of all the new species discovered since the publication of 

 that work, together with such additions as have been made to our 

 knowledge of the distribution of these animals. The notes thus form 

 a supplement to the Revision of the Astacidae. 



Cambarus blandingii (Harl.). 



Additional localities: North Eiver, Lexington, Virginia; Dismal 

 Swamp, outlet of Lake Drummond, Suffolk, Virginia; Tar River, 

 Rocky Mount, North Carolina ; Neuse River, Raleigh, North Carolina. 

 Collected by.D. S. Jordan (TJ. S. F. C). 



Cambarus blandingii acutus (Gir.). 



York, Clark County, Illinois. H. G. Hodge (TJ. S. N. M.). 



Cambarus versutus Hag. 



Additional locality : Escambia River at Flomaton, above Pensacola, 

 Florida. D. S. Jordan, B. W. Bvermann, and C. H. Bollman (M. C. Z.). 

 A young male. The rostrum tapers a little more than in the type speci- 

 mens from Mobile, Alabama, and is lightly carinate above in the median 

 line. In these respects it agrees with the specimens from Cape Bnr- 

 rancas, Florida, mentioned on page 34 of my Revision of the Astacidse. 



Cambarus alleni Fax. 



Florida. W. H. Dall (U. S. N. M.). Two 

 I, two females. In the female (now known for the first 

 time) the chelae are short and broad compared with those of the male. 



* A Revision of the Astacidse. By Walter Faxon. Parti. The Genera Cambarus 

 and Astacus. Mem. Mus. Comp. Zool., Vol. x, No. 4, 1885. 



Proceedings National Museum, Vol. XII— No. 785. 



619 



aithsoxuan Institution. 



May 22, 1800. 



