MILLER AND REHN: NORTH AMERICAN MAMMALS. 143 



Genus ZYGOGEOMYS Merriam.i 



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

 January 31, 1895. Type. — Zygogeomys trichopus Merriam. 



Zygogeomys trichopus Merriam. 



1895. Zygogeomys tricho^yus Merriam, North Amer. fauna, 



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

 Type locality. — Nahuatzin, State of Miehoacan, Mexico. 



Genus THOMOMYS Wied. 



1839. T/iomomys Wied, Nova acta phys. med. acad. caes. Leop. 

 Carol., XIX, pt. i, p. 377. Type. — TJiomomys rufescens Wied. 



Thomomys alpinus Merriam. 



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

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

 Ty'pe locality. — Big Cottonwood Meadows eight miles 

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

 California. Altitude, 10,000 feet. 



Thomomys altivallis Rhoads. 



1895. Thoinomys altivallis Rhoads, Proc. acad. nat. sci. 



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

 Ti-PE locality. — San Bernardino Mountains, California. 



Altitude, 5000 feet.- 



Thomomiys 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. 



