AMERICAISr BATS OF THE GENERA MYOTIS AND PIZONYX 69 



Distribution. — From southeastern British Columbia and western 

 Montana to the eastern base of the Cascade Mountains in central 

 Washington and Oregon, thence southward in California (excepting 

 the humid coastal strip which extends as far south as San Luis 

 Obispo County) to the coast of the southern part of the state. 



Diagnosis. — Color intermediate between that of the pallid Myotis 

 yumanensis yumanensis of the deserts and the dark M. yummiensis 

 saturatibs of the humid northwest coast. 



Color. — General color above very near tawny-olive of Ridgway 

 (1912). Below dull whitish with a tinge of buff y. Except about the 

 anal region the hairs are everywhere dark at their bases, nearly 

 fuscous. Ears and membranes translucent, pale brownish in color. 

 Specimens in immature pelage are darker above, nearly sepia. The 

 terminal part of the interfemoral membrane is often whitish, and oc- 

 casionally the extreme edge of the wing membranes as well. 



Measurements. — For measurements see tables, pages 73 and 75. 



Specimens examined^ — Total number 248, from the following 

 localities : 



BRITISH COLUMBIA: Kamloops, 1 skin, nearly typical (A.N.S.P.) ; Mount 

 Lehman, 1 skin (A.M.N.H.) ; Sicamous, 3 ale. (A.N.S.P.). 



CALIFORNIA: Alturus Lake, Modoc County, 1 ale. (U.S.N.M.) ; Beswick, 

 Siskiyou County, 2 skins (U.S.N.M.), nearly typical; Capistrano, Orange 

 County, 1 skin (U.S.N.M.) ; Cassel, Shasta County, 1 ale. (U.S.N.M.) ; 

 Chalk Peak, Monterey County, 1 skin (U. C.) ; Chico, Sacramento River, 

 Butte County, 1 skin (U.S.N.M.) ; Eagle Lake, Lassen County, 2 skins, 2 

 ale. (U.S.N.M.) ; Fort Tejon, Kern County, 48 skins including type (U. 

 C), 1 skin (U.S.N.M.), 4 skins (A.M.N.H.), 1 skin (F. M.), 1 skin 

 (A.N.S.P.), 11 ale. (U.S.N.M.) ; Fresno, Fresno County, 4 ale. (U.S.N.M.) ; 

 near Fruto, Glenn County, 1 skin (U. C.) ; Nevada City, Nevada County, 

 2 ale. (U.S.N.M.) ; near Oroville, Butte County, 1 skin (U. C.) ; San 

 Bernardino Mountains, San Bernardino County, 1 ale. (B. M.) ; San Luis 

 Rey, San Diego County, 8 ale. (U.S.N.M.) ; Tulare, Tulare County. 30 ale. 

 (U.S.N.M.) ; no exact locality, 4 ale. (U.S.N.M.). 



IDAHO: Payette Valley, 1 skin (U. C). 



MONTANA: Belton, 1 skull (U.S.N.M.); Corvallis, 36 skins, 48 ale., 1 

 skull (U.S.N.M.) ; Flathead Lake, Flathead County, 7 ale. (U.S.N.M.) ; 

 Powderville, 1 skull (U.S.N.M.). 



OREGON: Klamath Falls, 8 skins (U. C), 1 ale. (U.S.N.M.) ; Lone Rock, 2 

 ale. (U.S.N.M.). 



WASHINGTON: Chelan, 3 ale. (U.S.N.M.) ; Stehekin, 3 skins (U.S.N.M.) ; 

 Fort Walla Walla, 1 ale. (U.S.N.M.). 



WYOMING: Fremont Peak, 1 skin (U.S.N.M.). 



"NORTHWESTERN AMERICA": 1 skin (B. M.). 



Remarks. — Myotis yvmumensis sociahilis is intermediate in color 

 between the typical form of Myotis yumamensis and the dark M. 

 yimmnensis saturatus of the northwest coast, but the color characters 

 are fairly uniform over a wide area. In geographic variation Myotis 

 yuTTianensis parallels other members of the genus ; for example, Myotis 



