microtus. 251 



Richardson's Meadow Vole. 



Type locality. " Near the foot of the Rocky Mountains " ; vicinity 

 of Jasper House, Alberta, Canada. 



Geogr. Distr. Vicinity of Jasper House and of Henry House, 

 Alberta, Canada. 



a. Microtus richardsoni inacropus (Merriam). 



Arvicola tnacropus Merr., N. Am. Faun., No. 5, 1891, p. 59. 



Microtus richardsoni macropus Elliot, Syn. N. Am. Mamm., 

 F. C. M. Pub., II, 1901, p. 201, fig. 43 (M. macropus). Zool. 

 Ser. 

 BiG-FooTED Meadow Vole. 



Type locality. Pahsimeroi Mountains, Idaho. Altitude, 9,700 

 feet. 



Geogr. Distr. Rocky Mountains from the Wasatch north to 

 Canada, the Wind River Mountains of Wyoming, the Blue Mountains 

 of Oregon, and intermediate ranges. High altitudes. 



b. Microtus richdrdsoni arricoloides (Rhoads). 



Aulacomys arvicoloides Rhoads, Amer. Nat., xxviii, 1894, p. 182. 



Microtus principalis Rhoads, Amer. Nat., xxix, 1895, p. 940. 



Microtus richardsoni arvicoloides Elliot, Syn. N. Am. Mamm., 

 F. C. M. Pub., II, 1901, p. 202. Zool. Ser. 

 Cascade Mountains Meadow Vole. 



Type locality. Lake Kichelos, Kittitas County, Washington. 

 Altitude, 8,000 feet. 



Geogr. Distr. Cascade range in Oregon and Washington. High 

 elevations. 



Subgenus G. Orthriomys. 



611. Microtus umbrosus Merriam. 



Microtus umbrosus Merr., Proc. Biol. Soc. Wash., xii, 1898, p. 107. 

 Elliot, Mamm. Middle Amer. & W. Indies, F. C. M. Pub., iv, 

 Pt. I, 1904, p. 305, fig. 53. Zool. Ser. 

 Mount Zempoaltepec Meadow Vole. 



Type locality. Mount Zempoaltepec, State of Oaxaca, Mexico. 

 Altitude, 8,200 feet. 



Geogr. Distr. Known only from the type locality. 



Subgenus H. Herpetomys. 



612. Microtus guatemalensis Merriam. 



Microtus guatemalensis Merr., Proc. Biol. Soc. Wash., xii, 1898, 

 p. 108. Elliot, Mamm. Middle Amer. & W. Indies, F. C. M. 

 Pub., IV, Pt. I, 1904, p. 306, fig. 54. Zool. Ser. 



