328 U. S. NATIONAL MUSEUM BULLETIN 205 



Thoniomys umbrinus potosinus Nelson and Goldmanf * 



1934. Thomomys umbrinus potosinus Nelson and Goldman. Journ. Mamm., 

 vol. 15, No. 2, p. Ill, May 15, 1934. 



Type Locality. — La Tinaja, about 20 miles northeast of San Luis Potosi, San 

 Luis Potosi, Mexico. Altitude, 6,000 feet. Range. — Open plains of southwest- 

 ern San Luis Potosi. 



Thomomys umbrinus atrodorsalis Nelson and Goldman* 



1934. Thomomys umbrinus atrodorsalis Nelson and Goldman, Journ. Mamm., 



vol. 15, No. 2, p. Ill, May 15, 1934. 

 Type Locality. — Alvarez, about 3 miles north-northwest of San Luis Potosi, 



San Luis Potosi, Mexico. Altitude, 8,000 feet. Range. — Known from type 



locality only. 



Thomomys umbrinus arriagensis Dalquest* 



1951. Thomomys umbrinus arriagensis Dalquest, Journ. Washington Acad. 

 Sci., vol. 41, No. 11, p. 361, Nov. 14, 1951. 



Type Locality. — One kilometer south of Arriaga, San Luis Potosi, Mexico. 

 Range. — Known only from type locality on Plan de Arriaga, a small, high, arid 

 plain near Guanajuato boundary southwest of city of San Luis Potosi. 



Thomomys umbrinus zacalecae Nelson and Goldmanf* 



1934. Thomomys umbrinus zacatecae Nelson and Goldman, Journ. Mamm., 

 vol. 15, No. 2, p. 112, May 15, 1934. 



Type Locality. — Berriozabal, Zacatecas, Mexico. Altitude, 6,600 feet. 

 Range. — High arid plains of southeastern Zacatecas. 



Thoniomys umbrinus enixus Nelson and Goldmanf* 



1934. Thomomys umbrinus enixus Nelson and Goldman, Journ. Mamm., vol. 

 15, No. 2, p. 112, May 15, 1934. 



Type Locality. — Sierra Moroni, near Plateado, Zacatecas, Mexico. Altitude, 

 8,500 feet. Range. — Upper slopes of Sierra Moroni, southern Zacatecas. 



Thomomys umbrinus crassidens Nelson and Goldmanf* 



1934. Thomomys umbrinus crassidens Nelson and Goldman, Journ. Mamm., 



vol. 15, No. 2, p. 113, May 15, 1934. 

 Type Locality. — Sierra de Valparaiso, about 13 miles west of Valparaiso, west- 

 ern Zacatecas, Mexico. Range. — Known only from upper slopes of Sierra de 

 Valparaiso. 



Thomomys umbrinus durangi Nelson and Goldmanf* 



1934. Thomomys umbrinus durangi Nelson and Goldman, Journ. Mamm., vol. 

 15, No. 2, p. 114, May 15, 1934. 



Type Locality. — Durango, Durango, Mexico. Range. — High plains along east- 

 ern base of Sierra Madre, southern Durango. 



Thomomys umbrinus goldmani Merriamf * 



1901. Thomomys goldmani Merriam, Proc. Biol. Soc. Washington, vol. 14, p. 



108, July 19, 1901. 

 1934. Thomomys umbrinus goldmani Nelson and Goldman, Journ. Mamm., vol. 



15, No. 2, p. 115, May 15, 1934. 



