246 BULLETIN 138, UNITED STATES NATIONAL MUSEU.M. 



f'Thomomys bailey i Merriaiu. 



1901. Thomomys haileyi Merriam, Proc. Biol. Soc. Washing- 

 ton, vol. 14, p. 109. July 19, 1901. 



Type Locality. ^Sierra Blanca, El Paso County. Texas. 

 Range, — Sierra Blanca, western Texas, north to Tularosu. New 

 Mexico. 



t''- Thomomys lachuguilla (Bailey). 



1902. Thomomys aureus lachiiguilla Bailey, Proc. Biol. Soc 

 Wasliington, vol. 15, p. 120. June 2, 1902. 



1915. Thomomys lachuguilla Bailey, North Amer. Fauna, No. 39, 



p. 88. November 15, 1915. 

 Type Locality. — Arid foothills near El Paso, El Paso County, 



Texas. 

 Range.— Arid Lower Sonoran mesas in extreme western Texas 



and southern New Mexico, south to Casas Grandes, Chihuahua. 



iirn6rmMS-gi'oup . 



*Thomomys umbrinus umbrinus (Richardson"). 



1829. Geomys umhrinus Richardson, Fauna Boreali-Americana, 



vol. 1, p. 202. 

 1906. Thomomys umbrinus Bailey, Proc. Biol. Soc. Washington, 



vol. 19, p. 3. January 29, 1906. 

 Type Locality. — Southern Mexico; probably the vicinity of 



Boca del Monte, Vera Cruz. (See Bailey, Proc. Biol. Soc. 



Washington, vol. 19, pp. 3-6, January 29, 1906.) 

 Range. — Known only from Boca del Monte and Xuchil. Vera 



Cruz. 



t*Thomomys umbrinus orizabae (Merriam). 



1893. Thomomys orizabse Merriam, Proc. Biol. Soc. Washington, 



vol. 8, p. 145. December 29, 1893. 

 1915. Thomomys umbrinus orizabse Bailey, North Amer. Fauna, 



No. 39, p. 90. November 15, 1915. 

 Type Locality. — Mount Orizaba, Puebla, Mexico. Altitude, 



about 9,500 feet. 

 Range. — Known only from type locality. 



t*Thomomys umbrinus peregrinus (Merriam). 



1893. Thomomys 'peregrinus Merriam, Proc. Biol. Soc. Washing- 

 ton, vol. 8, p. 146. December 29, 1893. 



1915. Thomomys umbrinus 'peregrinus Bailey, North Amer. 

 Fauna, No. 39, p. 91. November 15, 1915. 



Type Locality. — Salazar, State of Mexico, Mexico. 



Range. — Mountain slopes in the Federal District of Mexico, east 

 to San Martin, Puebla, and north to El Chico, Plidalgo. 



