Fig. 31. Distribution of the mountain water shrew. Sorex palustris navigator, in Washington.
Neosorex navigator [Baird], Rept. Pacific R. R. Survey, 8 (pt. I): 11, 1857.
Sorex (Neosorex) palustris navigator [Merriam], N. Amer. Fauna, 10:92, December 31, 1895.
Sorex palustris navigator Stephens, California Mammals, p. 254, June, 1906.
Type.—Obtained at head of Yakima River, Kittitas County, Washington, by J. G. Cooper on August 31, 1853; type in United States National Museum.
Measurements.—Two males and 4 females from Washington average, respectively: total length 150, 150; length of tail 70, 74; hind foot 18.5, 20; weight?, 11.0 grams.
Distribution.—Mountainous areas of entire state, including the Olympic Mountains, from Elwah ([Jackson], 1928: 188) south to Quinault River ([Jackson], 1928: 189); the Cascades from Tomyhoi Lake (W. W. D.) south to 15 mi. N. Carson ([Jackson], 1928: 189); northeastern Washington from Shovel Creek (W. W. D.) south to Gifford ([Jackson], 1928: 189); the Blue Mountains at Godman Springs (M. V. Z.) and Hompeg Falls (M. V. Z.).
Description.—In general form of body the mountain water shrew resembles the cinereous shrew but is perhaps more stocky. It is a large shrew, nearly as large as a house mouse. The head and body measure about 3 inches; the tail also is about 3 inches long. The fur is exceedingly soft. The upper parts are blackish in color, lightly frosted with paler hairs. The underparts, from throat to vent, are whitish tinged with gray or brown. The stiff, curved fringe of bristles on the outer part of the hind foot serves as an aid in swimming.