RODENTIA: GEOMYIDAE 329 



Type Locality. — Mapimi, Durango, Mexico. Altitude, 3,800 feet. Range. — 

 Arid interior basin, or sink, in northeastern Durango known as Bolson de Ma- 

 pimi; probably ranging into adjoining parts of southwestern Coahuila, Mexico. 

 Thomomys umbriiius evexus Nelson and Goldman 



1934. Thomomys umbrinus evexus Nelson and Goldman, Journ. Maram., vol. 

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



Type Locality. — Mount San Gabriel, vicinity of Rosario, 10 miles northwest of 

 Villa Ocampo, Rio Florida, northwestern Durango, Mexico. Altitude, between 

 7,000 and 9,000 feet. Range. — Known from type locality only. 



Thomomys umbrinus perditus Merriamf * 



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



108, July 19, 1901. 

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



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

 Typical Locality. — Lampazos de Naranjo, Nuevo Leon, Mexico. Range. — Arid 

 plains and high mountains in eastern Coahuila, northern Nuevo Leon, and north 

 to western Texas. 



Thomomys umbrinus analogue Goldmanf* 



1938. Thomomys umbrinus analogus Goldman, Proc. Biol. Soc. Washington, 

 vol. 51, p. 59, Mar. 18, 1938. 



Type Locality. — Sierra Guadalupe, 12 or 15 miles south of General Cepeda, 

 southeastern Coahuila, Mexico. Range. — High mountains and desert plains of 

 southeastern Coahuila, Mexico. 



Thomomys umbrinus chihuahuae Nelson and Goldmanf* 



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



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

 Type Locality. — Sierra Madre, about 65 miles east of Batopilas, Chihuahua, 



Mexico. Altitude, 7,000 feet. Range. — Sierra Madre in southwestern Chihuahua, 



Mexico. 



Thomomys umbrinus madrensis Nelson and Goldmanf* 



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



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

 Type Locality. — Pilares Canyon, 10 miles northeast of Colonia Garcia, about 



25 miles southwest of Casas Grandes, northwestern Chihuahua, Mexico. Altitude, 



6,400 feet. Range. — Known from type locality only. 



Thomomys umbrinus caliginosus Nelson and Goldmanf* 



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



vol. 15, No. 2, p. 116, May 15, 1934. 

 Type Locality. — Eight miles west of Altamirano, Sierra Madre, northwestern 



Chihuahua, Mexico, near Sonora boundary [about 35 miles] west of Casas 



Grandes. Altitude, 8,000 feet. Range. — Known only along crest of Sierra Madre, 



northwestern Chihuahua. 



Thomomys umbrinus emotus Goldmanf* 



1933. Thomomys julvus emotus Goldman, Proc. Biol. Soc. Washington, vol. 46, 

 p. 76., Apr. 27, 1933. 



