1916. _Ochotona schisticeps muiri_ Grinnell and Storer, Univ. California Publ. Zool., 17:6, August 23, type from 9300 ft., Ten Lakes, Yosemite Nat'l Park, California. 1934. _Ochotona princeps muiri_, Hall, Proc. Biol. Soc. Washington, 47:103, June 13. _Marginal records._--Nevada (Hall, 1946:593): 8500 ft., 3 mi. S Mt. Rose, California (A. H. Howell, 1924:44): Markleeville; mts. W Bishop Creek; Washburn Lake; Latitude 39°, summit of Sierra. OCHOTONA PRINCEPS NEVADENSIS A. H. Howell. 1919. _Ochotona uinta nevadensis_ A. H. Howell, Proc. Biol. Soc. Washington, 32:107, May 20, type from 10,500 ft., Ruby Mts., SW Ruby Valley P. O., Elko County, Nevada. 1924. _Ochotona princeps nevadensis_ A. H. Howell, N. Amer. Fauna, 47:21, September 23. _Marginal records._--Nevada: 7830 ft., Long Creek (Hall, 1946:590); type locality. OCHOTONA PRINCEPS NIGRESCENS V. Bailey. 1913. _Ochotona nigrescens_ V. Bailey, Proc. Biol. Soc. Washington, 26:133, May 21, type from 10,000 ft., Jemez Mountains, Bernalillo County, New Mexico. 1924. _Ochotona princeps nigrescens_, A. H. Howell, N. Amer. Fauna, 47:26, September 23. _Marginal records_ (A. H. Howell, 1924:26).--Colorado: Upper Navajo River; Osier. New Mexico: type locality. Colorado: Navajo Peaks. OCHOTONA PRINCEPS PRINCEPS (Richardson). 1828. _Lepus_ (_Lagomys_) _princeps_ Richardson, Zool. Jour., 3:520, type from headwaters of Athabaska River, near Athabaska Pass, Alberta. 1897. [_Ochotona_] _princeps_, Trouessart, Catalogus Mammalium, p. 648. _Marginal records._--British Columbia: headwaters South Pine River (Anderson, 1947:95). Alberta: Muskeg Creek "about" 60 mi. N Jasper House (_ibid._). British Columbia: Morrissey (_ibid._). Montana: mts. near St. Marys Lake (A. H. Howell, 1924:14); mts. 15 mi. E Corvallis (_ibid._); Lake Como, Bitterroot Mts. (_ibid._). Idaho: Coeur d' Alene Nat'l Forest (Rust, 1946:322). British Columbia: Mt. Evans, "near" Cranbrook (A. H. Howell, 1924:14); Spillamacheen River (_ibid._) OCHOTONA PRINCEPS SAXATILIS Bangs. 1899. _Ochotona saxatilis_ Bangs, Proc. New England Zool. Club, 1:41, June 5, type from Montgomery, "near" Mt. Lincoln, Park County, Colorado. 1924. _Ochotona princeps saxatilis_, A. H. Howell, N. Amer. Fauna, 47:23, September 23. _Marginal records_ (A. H. Howell, 1924:24, except as otherwise noted).--Wyoming: Medicine Bow Mts.; just above Centennial in mts. (Martin, 1943:394). Colorado: Estes Park; Pikes Peak; Silverton. Utah: La Sal Mts. Colorado: Crystal Lake, 5 mi. W Lake City; Middle Brush Creek; Ten Mile Creek; Berthoud Pass; _Irwin Lakes_ (A. H. Howell, _loc. cit._) not found. OCHOTONA PRINCEPS SCHISTICEPS (Merriam).