MILLER AND REHN : NORTH AMERICAN MAMMALS. 
149 
Type locality. — Unknown (“ Cadadagiiios, a town in the 
southwestern part of Louisiana”). 
Regarded by Allen (Bull. Amer. mus. nat. hist., v, p. 56, April 
28, 1893) as undeterminable. 
Thomomys toltecus Allen. 
1893. Thomomys toltecus Allej^, Bull. Amer. mus. nat. hist., 
V, p. 52. April 28, 1893. 
Type locality. — Juarez, State of Chihuahua, Mexico. 
Thomomys townsendii (Bachman). 
1839. G-eomys townsendii Bachmax, Journ. acad. nat. sci. 
Phila., VIII, p. 105. 
1893. Thomomys toivnsendii Allex, 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., vii, p. 521. 
August, 1841. Type. — Dipodomys phillipsii Gray. 
Dipodomys ambiguus Merriam. 
1890. Dipodomys amhiguus 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., vii, p. 31, January 7, 1898) 
as a form of D. merricMni. 
