NORTH AMERICAN LAND MAMMALS. 163 



*Peromyscus nasutus (Allen). 



1891. Vesperimus nasutus Allen, Bull. Amer. Mus. Nat. Hist., 



vol. 3, p. 299. June 30, 1891. 

 1909. Peromyscus nasutus Osgood, North Amer. Fauna, No. 



28, p. 176. April 17, 1909. 

 Type Locality. — Estes Park, Larimer County, Colorado. 

 Range. — Mountains of Colorado, New Mexico, eastern Arizona, 



and western Texas, chiefly cast of the Continental Divide. 

 t*Peromyscus polius Osgood. 



1904. Peromyscus polius Osgood, Proc. Biol. Soc. Washington, 



vol. 17, p. 61. March 21, 1904. 

 Type Locality. — Colonia Garcia, Chihuahua, Mexico. 

 Range.— Known oiily from the type locality. 

 *Peromyscus difficilis difficilis (Allen). 



1891. Vesperimus difficilis Allen, Bull. Amer. Mus. Nat. Hist., 



vol. 3, p. 298. June 30, 1891. 



1897. [Peromyscus] difficilis Trouessart, Catal. Mamm. viv. foss., 

 p. 518. 



Type Locality. — Sierra de Valparaiso. State of Zacatecas, 

 Mexico. 



Range. — Sierra Madre from southwestern Chihuahua south 

 through Durango and Zacatecas, then east and southeast to 

 certain mountainous parts of Guanajuato and northern 

 Hidalgo, and thence north through parts of San Luis Potosi 

 to mountains of southern Coahuila. Chiefly m transition 

 zone. 



t*Peromyscus difficilis amplus (Osgood). 



1904. Peromyscus amplus Osgood, Proc. Biol. Soc. Washmgton, 



vol. 17, p. 62. March 21, 1904. 

 1909. Peromyscus difficilis amplus Osgood, North Amer. Fauna, 



No. 28, p. 181. April 17, 1909. 

 Type Locality. — Coixtlahuaca, Oaxaca, Mexico. 

 Range. — Mountains of north central Oaxaca, Puebla, south- 

 eastern Vera Cruz, and southern Hidalgo. 

 t*Peromyscus difficilis felipensis (Merriam). 



1898. Peromyscus felipensis Merriam, Proc. Biol. Soc. Washing- 

 ton, vol. 12, p. 122. April 30, 1898. 



1909. Peromyscus difficilis felipensis Osgood, North Amer. 



Fauna, no. 28, p. 182. AprU 17, 1909. 

 Type Locality. — Cerro San Fehpe, State of Oaxaca, Mexico. 



Altitude, 10,200 feet. 

 Range.— High elevations (8,000 feet to 11,000 feet) on the 



mountains surroundmg the Valley of Mexico; reappearing at 



similar elevations in the mountains northeast of the city of 



Oaxaca, 



