MICROTUS. 247 



a. Microtus chTotmn-hi nu s varus Bangs. 



Murotiis chrotorrhiiius raviis Bangs, Proc. Biol. Soc. Wash., xii, 

 1898, p. 188. Elliot, Syn. X. Am. Mamni., F. C. M. Pub., 11, 

 1901, p. 193. Zool. Ser. 

 Gray Rock Me.\dow Vole. 



Type locality. Black Bay, north shore of the Strait of Belle Isle, 

 Labrador. 



Geogr. Disir. Known only from the type locality. 



596. Microtus borealis (Richardson). 



Arvicola borealis Rich., Zool. Joum., iii, 1828, p. 517. 

 Microtus borealis Elliot. Syn. X. Am. Mamm., F. C. M. Pub., 11, 

 1901. p. 194. Zool. Ser. 

 Northern Me.\dow Vole. 



Type locality. Great Bear Lake, Mackenzie, Canada. 

 Geogr. Distr. Arctic America. Range unknown. 



Subgenus B. Lagimis. 



597. Microtus pauperrimus (Cooper). 



Anicola paupcrnma Cooper, Amer. Xat., 11, 1868. p. 535. 



Microtus pauperrimus Elliot, Syn. X. Am. Mamm.. F. C. M. 

 Pub.. II. 1901, p. 195. Zool. Ser. 

 PiG.MY Me.\dow Vole. 



Type locality. Plains of the Columbia near the Snake River, 

 southwestern Washington. 



Geogr. Distr. Washington and Oregon, central Idaho, and the 

 north slope of the Uinta Mountains, Utah. 



598. Microtus curtatus (Cope). 



An^icola curtata Cope, Proc. Acad. Xat. Scien. Phil.. 1868. p. 2. 



An'icola decurtata Coues, Mon. X. Am. Rod., 1877, p. 215. 



Mi<roius curtatus Elliot. Syn. X. Am. Mamm.. F. C. M. Pub.. 11, 

 iqoi, p. 195. fig. 39. Zool. Ser. 

 Short-t.\iledMe.\dow Vole. 



Type locality. Pigeon Spring, Mount Magruder. Xevada. 



Geogr. Distr. Eastern California, north of Death Valley and 

 western Xevada. 



599. .Microtus pallidus (Merriam). 



Arcicola pallidus! Merr., Amer. Xat.. x.xii. 1888. p. 702. 

 Microtus pallidus Elliot, Syn. X. Am. Mamm., F. C. M. Pub.. 11. 

 1901, p. 195. Zool. Ser. 

 P.\LLiD Me.\dow Vole. 



Type locality. Fort Buford, Howard County, Xorth Dakota. 

 Geogr. Distr. Xorth Dakota. Montana, north to Calgar\-, Alberta. 



