_Lagomys minimus_ Lord, Proc. Zoöl. Soc. London, p. 98, 1863 (not of Schinz, 1821). _Ochotona minimus_ Bangs, Proc. New England Zoöl. Club, 1:39, June 5, 1899. _Ochotona fenisex_ Osgood, Proc. Biol. Soc. Washington, 26:80, March 22, 1913 (substitute for _minimus_ Lord). _Ochotona princeps fenisex_ A. H. Howell, N. Amer. Fauna, 47:28, August 21, 1924. _Type._--Obtained by J. K. Lord at "Ptarmigan Hill," near head of Ashnola River, Cascade Range, British Columbia, in early fall of 1860 (?); type in British Museum. _Racial characters._--Size and color intermediate between _brunnescens_ and _cuppes_; length about 8 inches; color of upper parts near Pinkish Cinnamon, becoming gray on posterior third of back; underparts washed with buff; skull of medium size and proportions. _Measurements._--Nine males and 5 females from Okanogan and Chelan counties average, respectively: total length 190.0, 197.4; hind foot 31.1, 32.8; ear 21.6, 22.0. _Distribution._--Specimens referable to this race occur from the British Columbian boundary south, through the eastern Cascade Mountains. Along the western border of its range, _fenisex_ becomes larger and darker, merging into the race _brunnescens_. Marginal records are: Hidden Lakes (U.S.N.M.), Lyman Lake (U.S.N.M.), Mt. Stuart (W.W.D.), Easton (U.S.N.M.), Mt. Aix (U.S.N.M.), Steamboat Mt. (M.V.Z.). =Ochotona princeps brunnescens= Howell _Ochotona fenisex brunnescens_ A. H. Howell, Proc. Biol. Soc. Washington, 32:108, May 20, 1919. _Ochotona princeps brunnescens_ A. H. Howell, N. Amer. Fauna. 47:31, August 21, 1924. _Type._--Obtained by George G. Cantwell at Lake Keechelus, Kittitas County, Washington, on August 23, 1917; type in United States National Museum. _Racial characters._--Largest and darkest of the three races of Washington pikas; total length 8 inches or more; color of upper parts rich cinnamon, heavily washed with blackish; posterior part of back slightly paler; underparts buffy cinnamon; skull large and heavy with wide zygomatic arches but relatively narrow interorbital region and relatively narrow across maxillary tooth rows. _Measurements._--Eight males and 9 females from within three miles of Stevens Pass, King and Chelan counties, average, respectively: total length 201.8, 208.3; hind foot 33.3, 33.0; ear 22.3, 22.6. The average weights of 4 males and 3 females from 3 mi. S E Tumtum Mountain, Clark County, are 178.0 and 174.3 grams, respectively.