MILLER AND REHN : NORTH AMERICAN MAMMALS. 149 



TYPE LOCALITY. Unknown ("Cadadaguios, a town in the 



southwestern part of Louisiana"). 



Regarded by Allen (Bull. Amer. mus. jiat. hist., v, p. 56, April 

 28, 1893) as undeterminable. 



Thomomys toltecus Allen. 



1893. Thomomys toltecus ALLEX, Bull. Amer. rnus. nat. hist., 



v, p. 52. April 28, 1893. 

 TYPE LOCALITY. Juarez, State of Chihuahua, Mexico. 



Thomomys townsendii (Bachman) . 



1839. Geomys townsendii BACHMAX, Journ. acad. nat. sci. 



Phila., vm, p. 105. 

 1893. Thomomys townsendii ALLEN, Bull. Amer. mus. nat. 



hist., Y, p. 61. April 28, 1893. 

 TYPE LOCALITY. " Rocky Mountains "; probably southwestern 



Wyoming (see Allen, Bull. Amer. mus. nat. hist., v, p. 61, 



April 28, 1893). 



Family HETEROMYIDAE. 



Subfamily DIPODOMYIXAE. 



Genus DIPODOMYS Gray. 



1841. Dipodomys GRAY, Ann. and mag. nat. hist., vn, p. 521. 

 August, 1841. Type. Dipodomys phillipsii GRAY. 



Dipodomys ambiguus Merriam. 



1890. Dipodomys ambiguus MERRIAM, North Amer. fauna 



no. 4, p. 42. October 8, 1894. 

 TYPE LOCALITY. El Paso, El Paso County, Texas. 

 Regarded by Merriam (Science, n. s., vn, p. 31, January 7, 1898) 

 as a form of D. merriami. 



