MILLER AND REHN: NORTH AMERICAN MAMMALS. 143 



Genus ZYGOG-EOMYS Men-lam. 1 



1895. Zygogeomys MERRIAM, North Amer. fauna, no. 8, p. 195. 

 January 31, 1895. Type. Zygogeomys trichopus MERKIAM. 



Zygogeomys trichopus Merriam. 



1895. Zygogeomys trichopus MEERIAM, North Amer. fauna, 



no. 8, p. 196. January 31, 1895. 

 TYPE LOCALITY. Nahuatzin, State of Michoacan, Mexico. 



Genus THOMOMYS Wied. 



1839. Thomomys WIED, Nova acta phys. med. acad. caes. Leop.- 

 Carol., xix, pt. i, p. 377. Type. Thomomys rufescens WIED. 





Thomomys alpinus Merriam. 



1897. Thomomys alpinus MERRIAM, Proc. biol. soc. Washing- 

 ton, xi, p. 216. July 15, 1897. 



TYPE LOCALITY. Big Cottonwood Meadows eight miles 

 southeast of Mt. Whitney peak, High Sierra, Tulare County, 

 California. Altitude, 10,000 feet. 



Thomomys altivallis Rhoads. 



1895. Thomomys altivallis RHOADS, Proc. acad. nat. sci. 



Phila., p. 34. February 21, 1895. 

 TYPE LOCALITY. San Bernardino Mountains, California. 



Altitude, 5000 feet. 



Thomomys angularis Merriam. 



1897. Thomomys angularis MERRIAM, Proc. biol. soc. Wash- 

 ington, xi, p. 214. July 15, 1897. 

 TYPE LOCALITY. Los Banos, Merced County, California. 



1 Revised by Merriam, North Amer. fauna, no. 8, pp. 195-198. January 31, 1895. 



