502 U. S. NATIONAL MUSEUM BULLETIN 205 



Peromyscus difficilis difficilis (J. A. Allen) * 



1891. Vesperimus difficilis J. A. Allen, Bull. Anier. Mus. Nat. Hist., vol. 3, 

 p. 298, June 30, 1891. 



1897. [Peromyscus] difficilis Trouessart, Catalogus Mammalium . . . , fasc. 

 3, p. 518. 



Type Locality. — Sierra de Valparaiso, Zacatecas, Mexico. Range. — Sierra 

 Madre from southwestern Chihuahua south through Durango and Zacatecas, then 

 east and southeast to certain mountainous parts of Nuevo Leon (Koestner, Journ. 

 Mamm., vol. 25, No. 3, p. 288, Nov. 8, 1944; Hooper, Journ. Mamm., vol. 28, 

 No. 1, p. 51, Feb. 17, 1947), Guanajuato and northern Hidalgo, and thence north 

 through parts of San Luis Potosi to mountains of southern Coahuila. Zonal 

 range, chiefly Transition. 



Peromyscus difficilis amplus Osgoodf* 



1904. Peromyscus amplus Osgood, Proc. Biol. Soc. Washington, vol. 17, p. 62, 



Mar. 21, 1904. 

 1909. Peromyscus difficilis amplus Osgood, North Amer. Fauna No. 28, 



p. 181, Apr. 17, 1909. 

 Type Locality. — Coixtlahuaca, Oaxaca, Mexico. Range. — Mountains of north- 

 central Oaxaca, Puebla, southeastern Veracruz, Tlaxcala (Davis, Journ. Mamm., 

 vol. 25, No. 4, p. 396, Dec. 12, 1944) , and southern Hidalgo, Mexico. 



Peromyscus difficilis felipensis Merriamf * 



1898. Peromyscus felipensis Merriam, Proc. Biol. Soc. Washington, vol. 12, 

 p. 122, Apr. 30, 1898. 



1909. Peromyscus difficilis felipensis Osgood, North Amer. Fauna No. 28, 

 p. 182, Apr. 17, 1909. 



Type Locality. — Cerro San Felipe, Oaxaca, Mexico. Altitude, 10,200 feet. 

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

 Valley of Mexico; reappearing at similar elevations in mountains northeast of 

 city of Oaxaca. 



Peromyscus builatus Osgoodf* 



1904. Peromyscus builatus Osgood, Proc. Biol. Soc. Washington, vol. 17, p. 63, 

 Mar. 21, 1904. 



Type Locality. — Perote, Veracruz, Mexico. Range. — Recorded also from 

 Limon, Veracruz, Mexico (Hoffmeister, Illinois Biol. Monogr., vol. 21, No. 4. 

 p. 25, Nov. 12, 1951). 



melanophrys — group 



Peromyscus melanophrys melanophrys (Coues) f * 



1874. Hesperomys (Vesperimus) melanophrys Coues, Proc. Acad. Nat. Sci. 



Philadelphia, vol. 26, p. 181, Dec. 15, 1874. 

 1884. Hesperomys melanophrys True, Proc. U. S. Nat. Mus., vol. 7 (App., Circ. 



29), p. 598, Nov. 29, 1884. 

 1894. Peromyscus leucurus Thomas, Ann. Mag. Nat. Hist., ser. 6, vol. 14, 



p. 364, November 1894. (Tehuantepec, Oaxaca, Mexico.) 

 1897. P[eromyscus] melanophrys J. A. Allen, Bull. Amer. Mus. Nat. Hist., 



vol. 9, p. 51, Mar. 15, 1897. 



