634 NORTH AMERICAN ASTACID.E FAXON 



the rostrum is eveii flatter than in the typical form, taperiug, and fur- 

 nished with minute ante-apical teeth. 



Astacus klamathensis Stir;ps. 



Additional localities : Sprague and Williamson's Rivers, near Fort 

 Klamath, Oregon. Dr. J. C. Merrill, U. S. Army (U. b. N. M.). Eel 

 Eiver, Humboldt County, California. Teste W. N. LockiLigton.* A 

 small specimen, 37 miu long, collected by Dr. Merrill in Klamath Lake, 

 Oregon, is labeled " Color in life, bluish green." An adult collected 

 by the same gentleman is accompanied by the following note : " Color 

 when fresh, bright red, lighter beneath ; large claws darker. Common." 



Astacus nigrescens Stimps. 



" This species appears to be found in most of the larger brooks of 

 the central counties of California, such as the Alameda Creek, Alanuda 

 County ; Coyote Creek, Santa Clara County, and San Joaquin Slough." 

 Lockington, I. c. 



* Remarks upon the Thalassinidea and Astacidea of the Pacific coast of North 

 America, with description of a New Species. By W. N. Lockington. Ann. Mag. 

 Nat. Hist,, 5th series, Vol. II, 1878, p. 303. 



Museum of Comparative Zoology, 



Cambridge, Massachusetts, January 1. 1890. 



