MILLER AND REHN:.NORTH AMERICAN MAMMALS. 143 
Genus ZYGOGEOMYS Merriam.i 
1895. Zygogeomifs Merriam, North Amer. fauna,' no. 8, p. 195. 
January 31, 1895. Type. — Zygogeomys trichopus Merriam. 
Zygogeomys trichopus Merriam. 
1895. Zygogeomys trichopus Merriam, 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. hiol. soc. Washiug- 
' ton, XI, 23. 216. July 15, 1897. 
Type locality. — Bio; Cottonwood Meadows eisjht miles 
southeast of Mt. Whitney peak. High Sierra, Tulare County, 
California. Altitude, 10,000 feet. ‘ 
Thomomys altivallis Rhoads. 
1895. Thoynomys altivallis Rhoads, Proc. acad. nat. sci. 
Phila., Y>. 34. February 21, 1895. 
Type locality. — San Bernardino Mountains, California. 
Altitude, 5000 feet. 
Thomomys angularis Merriam. 
1897. Thoynomys ayigidaris Merriam, Proc. biol. soc. Wash¬ 
ington, XI, p. 214. July 15, 1897. 
Type locality. — Los Baiios, Merced County, California. 
1 Revised by Merriam, North Amer. fauna, no. 8, pp. 195-198. January 31,1895. 
