1916] Taylor: Beavers of Western North Ann rim 433 



tinguished by slightly paler coloration. See table of color characters, 

 table VII, opposite page 432. 



Twenty-two specimens, skulls only with one exception, partly 

 from the collection of the Museum of Vertebrate Zoology, partly 

 from that of the Biological Survey Collection in the U. S. National 

 Museum: Beluga River, Cook Inlet region, Alaska, 10 (nos. 4219- 

 4228, skulls only, Mus. Vert. Zool.) ; Nenilchuk or Ninilchik, cast 

 shore Cook Inlet, 2 (nos. 4229, 4230, skulls only, Mus. Vert. Zool.) ; 

 Kasiliff (probably Kasilof), mouth of Kasilof River, Cook Inlet, 

 1 (no. 4232, skull only, Mus. Vert. Zool.) ; Snug Harbor, probably 

 west shore Cook Inlet near Iliamna Peak, 1 (no. 4347, skin and 

 skull, Mus. Vert. Zool.) ; and probably from Cook Inlet, no data 

 attached, 2 (nos. 4231, 4233, skulls only, Mus. Vert. Zool.) ; 12 miles 

 north Stuart Lake, British Columbia, 1 (no. 77147, skull only, U. S. 

 Nat. Mus., Biol. Surv. coll.) ; 15 miles north Stuart Lake, 1 (no. 

 77155, skull only, U. S. Nat. Mus., Biol. Surv. coll.) ; 17 miles north 

 Stuart Lake, 1 (no. 77157, skull only, U. S. Nat. Mus., Biol. Surv. 

 coll.) ; 20 miles east Stuart Lake, 2 (nos. 77150, 77159, skulls only, 

 U. S. Nat. Mus., Biol. Surv. coll.) ; 30 miles east Stuart Lake, 1 

 (no. 77158, skull only, U. S. Nat. Mus., Biol. Surv. coll.). 



Description op a New Subspecies of Beaver prom Eastern Shasta 

 County, California 



Certain crania of beavers obtained in California have recently 

 been received from the Bureau of Biological Survey, of the United 

 States Department of Agriculture. These belong to specimens col- 

 lected at Cassel, on Hat Creek, a tributary of the Pit River, eastern 

 Shasta County, California, which, while they are undoubtedly most 

 closely related to Castor subauratus subauratus of the interior val- 

 leys of California, do present constant differences therefrom. 



Castor subauratus shastensis, new subspecies 



Type.— Skull only, $ adult; no. 50978, U. S. Nat. Mus., Biol. 

 Surv. coll.; Cassel [Hat Creek], Pit River, Shasta County, Cali- 

 fornia ; January 3, 1893 ; collected by H. E. Williams. 



Diagnostic characters. — No skins of the new form are available. 



