298 BULLETIN 128, UNITED STATES NATIONAL MUSEUM. 



t*Microdipodops megacephalus oregonus Merriam. 



1 901 . Microdipodops megacephalus oregonus Merriam, Proc. Biol. 



Soc. Washington, vol. 14, p. 127. July 19, 1901. 

 Type Locality, — Lake Alvord, Alvord Desert, Harney County, 

 Oregon. 



t*Microdipodops pallidus Merriam. 



1901. Microdipodops pallidus Merriam, Proc. Biol. Soc. Wash- 

 ington, vol. 14, p. 127. July 19, 1901. 

 Type Locality. — Ten miles east of Stillwater, near sink of the 

 Humboldt and Carson, Churchill County, Nevada. 



* Microdipodops polionotus Grinnell. 



1914. Microdipodops polionotus Grinnell, Univ. Calif. Publ. 



Zool., vol. 12, p. 302. April 15, 1914. 

 Type Locality. — McKeever's Kanch, 2 miles south of Benton 



Station, Mono County, California. Altitude, 5,200 feet. 



Family CASTORIDiPl (Beavers.) 



Genus CASTOR Linnaeus. 



1758. Castor Linnaeus, Syst. Nat., ed. 10, vol. 1, p. 58. Type, 

 Castor fiber Linn^us. 



* Castor caecator Bangs. 



1913. Castor cxcator Bangs, Bull. Mus. Comp. Zool., vol. 54, p. 



513. July, 1913. 

 Type Locality.— Near Bay St. George, Newfoundland. 



*Castor canadensis canadensis Kuhl. 



1820. Castor canadensis Kuhl, Beitrage z. Zoologie, p. 64. 

 1885. Castor fiber True, Proc. U. S. Nat. Mus., vol. 7 (1884), 



p. 596. 1885. 

 1890. Castor canadensis Merriam, North Amer. Fauna, No. 3, 



p. 59. September 11, 1890. 

 Type Locality. — Hudson Bay. 



Castor canadensis belugas Taylor. 



1916. Castor canadensis belugse Taylor, LTniv. Calif. Publ. Zool. 



vol. 12, p. 429. March 20, 191G. 

 Type Locality. — Beluga River, Cook Inlet region, Alaska. 



*Castor canadensis carolinensis Rhoads. 



1898. Castor canadensis carolinensis Rhoads, Trans. Amer. 

 Philos. Soc, n. s., vol. 19, p. 420. September, 1898. 

 . Type Locality. — Dan River, near Danbury, Stokes County, 

 North Carolina. 



