MILLER AND REHN: NORTH AMERICAN MAMMALS. 129 



Microtus minor (Meniam) . 



1SS8. Arvirola (lusterKS minor Merriam, Amer. nat., xxii, 



p. 600. July, 1888. 

 1900. Jlicrofus 7nhwr Bailey, aSTorth Amer. fauna, no. 17, 



p. 75. June 6, 1900. 

 Type locality. — Bottineau, at base of Turtle Mountains,, 



Bottineau County, North Dakota. 



Subgenus Orthriomys Merriam. 



1898. OrthriorKijs Merriam, Proc. biol. soc. Washington, xii, 

 p. 106. April 30, 1898. Type, — Microtus umhrosas Merriam. 



Microtus umbrosus Merriam. 



1898. Microtus umbrosus Merriam, Proc. biol. soc. Wash- 

 ington, XII, p. 107. April 30, 1898. 



Type locality. — Mount Zempoaltepec, State of Oaxaca^ 

 Mexico. Altitude, 8200 feet. 



Subgenus Herpetomys Merriam. 



1898. Ilerpetomi/s Merriam, Proc. biol. soc. Washington, xii, 

 p. 107. April 30, 1898. Type. — Microtus (/uatemcdeusis Merriam. 



Microtus guatemalensis Merriam. 



1898. Mirrof(fs tju((tcmalensis Merriam, Proc. biol. soc. 



Washington, xii, p. 108. April 30, 1898. 

 Type locality. — Todos Santos, State of Huehuetenango, 



Guatemala. Altitude, 10,000 feet. 



