This species shares with _Myotis californicus_ the habit of apparently drinking salt water. A specimen obtained at Sportsmans Lake, San Juan County, held one embryo on June 27, 1938. One from Peavine Pass, Blakeley Island, San Juan County, held one embryo on June 22, 1939. =Myotis yumanensis sociabilis= H. W. Grinnell _Myotis yumanensis sociabilis_ H. W. Grinnell, Univ. California Publ. Zoöl., 12:318, December 4, 1914. _Type._--Obtained at old Fort Tejon, Kern County, California, by J. Grinnell on July 23, 1904; type in Museum of Vertebrate Zoölogy. _Racial character._--Color pale. _Measurements._--Two males and 2 females from Selah, Yakima County, average: total length 78; length of tail 36; hind foot 10; ear 14; height of tragus 7. _Distribution._--Eastern Washington generally. Marginal records on the west are: Stehekin (Miller and Allen, 1928: 69), and Selah (W.W.D.). [Illustration: FIG. 35. Distribution of the fringe-tailed myotis and the Keen myotis in Washington. A. _Myotis thysanodes thysanodes._ B. _Myotis keenii keenii._] =Myotis yumanensis saturatus= Miller _Myotis yumanensis saturatus_ Miller, N. Amer. Fauna, 13:68, October 16, 1897. _Type._--Obtained at Hamilton, Skagit County, Washington, by T. S. Palmer on September 13, 1889; type in United States National Museum. _Racial character._--Color dark. _Measurements._--Eighteen adults of both sexes from San Juan County, Washington, average: Total length 78.2; length of tail 34.4; hind foot 10.1; ear 15; height of tragus 7.4; weight 5.9 grams. _Distribution._--From the eastern base of the Cascade Mountains to the Pacific. This is the commonest _Myotis_ found in western Washington. Marginal localities are: Hamilton (Miller and Allen, 1928: 71), and Goldendale (Miller and Allen, 1928: 71). =Myotis keenii keenii= (Merriam) Keen myotis _Vespertilio subulatus keenii_ Merriam, Amer. Nat., 29:860, September, 1895. _Myotis subulatus keenii_ Miller, N. Amer. Fauna, 13:77, October 16, 1897. _Myotis keenii keenii_ Miller and Allen, U. S. Nat. Mus. Bull., 144:104, May 25, 1928. _Type._--Obtained at Masset, Graham Island, Queen Charlotte Islands, British Columbia, by J. H. Keen in 1894; type in United States National Museum. _Measurements._--Miller and Allen (1928: 109) list the measurements of a male from Sol Duc Hot Springs, Clallam County, and a specimen of unknown sex from Lake Cushman, Jefferson County, as, respectively: total length 89, 87; length of tail 34, 36; hind foot 8.4, 7.4; ear?, 14.6. _Distribution._--Only the Olympic Peninsula, where it has been recorded by Miller and Allen (1928: 104) from Sol Duc Hot Springs and Lake Cushman.