426 U. S. NATIONAL MUSEUM BULLETIN 205 



Jefferson, El Paso, Mesa, Delta, and Gunnison Counties, Colo.; south to Colfax 

 County, northeastern New Mexico (Hill, Journ. Mamm., vol. 23, No. 1, p. 80, 

 Feb. 14, 1942). 



Castor canadensis duchesnei Durrant and Crane* 



1948. Castor canadensis duchesnei Durrant and Crane, Univ. Kansas Publ. 

 Mus. Nat. Hist., vol. 1, No. 20, p. 413, Dec. 24, 1948. 



Type Locality. — Duchesne River, 10 miles northwest of Duchesne, Duchesne 

 County, Utah. Altitude, 5,600 feet. Range. — Drainage of Duchesne and White 

 Rivers in Utah and Colorado. 



Castor canadensis pallidus Durrant and Crane 



1948. Castor canadensis pallidus Durrant and Crane, Univ. Kansas Publ. Mus. 

 Nat. Hist., vol. 1, No. 20, p. 409, Dec. 24, 1948. 



Type Locality. — Lynn Canyon, Box Elder County, Utah. Altitude, 7,500 feet. 

 Range. — Known from Raft River Mountains only. 



Castor canadensis rostralis Durrant and Crane 



1948. Castor canadensis rostralis Durrant and Crane, Univ. Kansas Publ. Mus. 

 Nat. Hist., vol. 1, No. 20, p. 411, Dec. 24, 1948. 



Type Locality. — Red Butte Canyon, Fort Douglas, Salt Lake County, Utah. 

 Altitude, 5,000 feet. Range. — Known from western streams of Wasatch Moun- 

 tains; probably occurs in all streams draining westward into basin of Pleistocene 

 Lake Bonneville. 



Castor canadensis mexicanus V. Baileyf* 



1913. Castor canadensis mexicanus V. Bailey, Proc. Biol. Soc. Washington, 

 vol. 26, p. 191, Oct. 23, 1913. 



Type Locality. — Ruidoso Creek, 6 miles below Ruidoso, Lincoln County, 

 N. Mex. Range. — Pecos River and Rio Grande and some tributary streams in 

 New Mexico (V. Bailey, North Amer. Fauna No. 53 (December 1931), p. 213, 

 Mar. 1, 1932) ; formerly on both sides of Rio Grande to Brownsville, Tex., and 

 to below Matamoros, northeastern Tamaulipas, Mexico; also Pecos and Devils 

 Rivers in southwestern Texas (V. Bailey, North Amer. Fauna No. 25, p. 124, Oct. 

 24, 1905) ; recently recorded along Rio Grande from mouth of Santa Helena 

 Canyon to mouth of Boquillas Canyon, Tex. (Borell and Bryant, Univ. Cali- 

 fornia Publ. Zool., vol. 48, No. 1, p. 28, Aug. 7, 1942) . 



Castor canadensis frondator Mearnsf * 



1897. Castor canadensis frondator Mearns, Preliminary diagnoses of new 

 mammals of the genera Sciurus, Castor, Neotoma, and Sigmodon, from the 

 Mexican border of the United States, p. 2, March 5, 1897. (Preprint of 

 Proc. U. S. Nat. Mus., vol. 20, p. 502, Jan. 19, 1898.) 

 Type Locality. — Rio San Pedro, northeastern Sonora, Mexico, near monument 

 No. 98 of the Mexican boundary. Range. — Rio San Pedro and Rio Sonora in 

 northeastern Sonora, Mexico (Burt, Univ. Michigan Mus. Zool. Misc. Publ. 39, 

 p. 50, Feb. 15, 1938) ; formerly Rio San Pedro and Gila River Valleys in south- 

 eastern Arizona, but not native to Chiricahua Mountains in Cochise County 

 (Cahalane, Journ. Mamm., vol. 20, No. 4, p. 431, Nov. 14, 1939) ; and eastward 

 to headwaters of Gila, San Francisco and Zuni Rivers in western New Mexico 



