_Measurements._--Twenty-five males and 15 females average: total length 160; length of tail 71; hind foot 19.8; ear 17.7. _Distribution._--The Columbian Plateau. Intergradation with _oreas_ occurs between the Columbia River and the Cascade Mountains. Marginal records on the west are: Chelan (W.W.D.), Leavenworth (W.W.D.), Cle Elum (W.W.D.), Satus Pass (W.W.D.), Lyle (V.B.S.). Marginal localities on the north are: Chelan (W.W.D.), 5 miles north of Coulee (W.W.D.), Sprague (V.B.S.) and Steptoe Butte (M.V.Z.). =Peromyscus maniculatus artemisiae= (Rhoads) _Sitomys americanus artemisiae_ Rhoads, Proc. Acad. Nat. Sci. Philadelphia, p. 260, October 23, 1894. _Peromyscus texanus artemisiae_ Miller and Rehn, Proc. Boston Soc. Nat. Hist., 30:84, December, 1901. _Peromyscus maniculatus artemisiae_ Osgood, N. Amer. Fauna, 28:58, April 17, 1909. _Type._--Obtained at Ashcroft, British Columbia, by S. N. Rhoads on July 5, 1892; type in Philadelphia Academy of Sciences. _Racial characters._--Similar to _gambelii_ but darker, more reddish; often with longer tail. _Measurements._--Ten males and 10 females from northeastern Washington average: total length 167; length of tail 80; hind foot 20; ear 17.8. _Distribution._--Northeastern Washington and the Blue Mountains of southeastern Washington, extending west, in northeastern Washington, to Conconully (W.W.D.) and south to Duly Lake (W.W.D.). =Neotoma cinerea= Ord Bushy-tailed wood rat _Description._--The bushy-tailed wood rat is slightly larger than the common Norway or brown rat. The head and body measure about 12-1/2 inches and the tail about 3-1/2 inches. It resembles the deer mouse in general proportions. The ears are large and naked and the black eyes are large and protruding. The tail is bushy, squirrel-like. The feet are small and have furry soles. The fur is soft and silky. Adults are brownish gray above with white underparts and a gray tail. Young individuals have blue-gray upper-parts.