NORTH AMERICAN RECENT MAMMALS. 415 



longicaudus-grou p . 



t*Microtus longicaudus (Merriam). 

 ■ 1888. Arvicola {Mynomes) longicaudus Merriam, Amer. Nat., 

 vol. 22, p. 934. October, 1888. 

 1895. Microtus {Mynomes) longicaudus Allen, Bull. Amer. Mus. 



Nat. Hist., vol. 7, p. 266. August 21, 1895. 

 Type Locality. — Custer, Black Hills, Custer County, South 



Dakota. Altitude, 5,500 feet. 

 Range. — Boreal cap of the Black Hills and do\vn some of the 

 cold streams well into the transition zone. 



t*Microtus mordax mordax (^lerriam). 



1891 . Arvicola ( Mynomes) mordax Merriam, North Amer. Fauna, 

 No. 5, p. 61. July 30, 1891. 



1897. [MicrotijLs] mordax Trouessart, Catal. Mamm. viv. foss.. 

 p. 564. 



1899. Microtus vellerosus Allen, Bull. Amer. Mus. Nat. Hist., 

 vol. 12, p. 7. March 4, 1899. (Upper Liard River, British 

 Columbia, Canada.) 



1899. Microtus cautus Allen, Bull. Amer. Mus. Nat. Hist., 

 vol. 12, p. 7. March 4, 1899. (Hells Gate, Liard River, 

 British Columbia, Canada.) 



Type Locality. — Sawtooth (or Alturas) Lake, east base of Saw- 

 tooth Mountains, Blaine County, Idaho. Altitude, 7,200 feet. 



Range. — Rocky Mountains and outlying ranges from latitude 

 60° to northern New Mexico, and south in the Cascades and 

 Sierra Nevada as far as Kaweah and Kern Rivers, California. 

 In the Cascades mainly confined to the east slope, but extend- 

 ing west to the Siskiyous, in southern Oregon, and Salmon and 

 Trinity Mountains in northern California. Found in most of 

 the isolated ranges of eastern Oregon and northern and central 

 Nevada. Common in Canadian and Hudsonian zones. 



*Microtus mordax sierrae R. Kellogg. 



1922. Microtus mordax sierrae R. Kellogg, Univ. Calif. Publ. 



Zool., vol. 21, p. 288. April 18, 1922. 

 Type Locality. — Tuolumne Meadows, Yosemite National Park, 

 California. Altitude, 8,600 feet. 



t*Microtus mordax bernardinus Merriam. 



1908. Microtus mordax bernardinus Merriam, Proc. Biol. Soc. 



Washington, vol. 21, p. 145. June 9, 1908. 

 Type Locality. — Dry Lake, San Bernardino Mountains, San 

 Bernardino County, California. Altitude, 9,000 feet. 



