_Type._--Obtained at Old Fort Steilacoom, Pierce County, Washington, by J. G. Suckley, probably on January 20, 1854; type in United States National Museum. _Racial characters._--Similar to _oreas_ but smaller with relatively shorter tail; tail narrower at base, less sharply bicolor; upper parts duller, browner, less reddish. In _oreas_ the tail is usually more than 100 mm. In _austerus_ the tail is usually less than 90 mm. _Measurements._--Twenty-seven males and 23 females from Seattle, King County, average: total length 180.5; length of tail 88.6; hind foot 21; ear 18. The average weight of 15 adults is 21 grams. _Distribution._--The Puget Sound area and south to the Columbia River in a narrow band through the lowlands. Marginal localities on the west side of Puget Sound are: Port Angeles (W.W.D.), Bremerton (W.W.D.), 4 miles north of Shelton (W.W.D.), Tenino (W.W.D.) and Mouth of Klama River (M.V.Z.). Marginal localities on the east side of Puget Sound are: Bellingham (W.W.D.), Arlington (W.W.D.), Everett (W.W.D.), 4 miles east of Monroe (W.W.D.), Fall City (W.W.D.), and Vancouver (W.W.D.). =Peromyscus maniculatus rubidus= Osgood _Peromyscus oreas rubidus_ Osgood, Proc. Biol. Soc. Washington, 14:193, December 12, 1901. _Peromyscus maniculatus rubidus_ Osgood, N. Amer. Fauna, 28:65, April 17, 1909. _Type._--Obtained at Mendocino City, California, by J. A. Loring on November 17, 1897; type in United States National Museum. _Racial characters._--Closely similar to _austerus_ but paler with longer skull. Specimens from Washington are almost purplish-brown in appearance. _Measurements._--Six males and 2 females from Puget Island, Wahkiakum County, average: total length 177; length of tail 89; hind foot 21.9; ear 18.7. _Distribution._--This is the deer mouse of the humid coastal belt of Oregon and California. It enters Washington only at Puget Island, Wahkiakum County, in the Columbia River. =Peromyscus maniculatus gambelii= (Baird) _Peromyscus gambelii_ Baird, Mamm. N. Amer., Pacific R. R. Reports, 8:464, 1857. _Sitomys americanus gambelii_ Allen, Bull. Amer. Mus. Nat. Hist., 5:190, August 18, 1893. _P[eromyscus]., t[exanus]. gambelii_ Mearns, Proc. U. S. Nat. Mus., 18:446, March 25, 1896. _Peromyscus maniculatus gambeli_ Osgood, N. Amer. Fauna, 28:67, April 17, 1909. _Type._--Obtained at Monterey, Monterey County, California, by W. P. Trowbridge; skin catalogued on January 4, 1853; type in United States National Museum. _Racial characters._--Size small; tail short; color pale, varying from buffy gray to rich buff; rarely dark reddish brown.