376 NORTH AMERICAN FAUNA [No. .55 



lower parts dull tawny or pale buffy in immature specimens; ears and mem- 

 branes dark brown or blackish. 



Measurements. Adult female from Fremont: Total length, 98 mm; tail, 42; 

 foot, 10; ear (dry), 11; forearm, 40. Another female from same place: 101; 

 45; 10: 11; 40. 



Distribution and habitat. The arid interior region from eastern 

 Washington and Oreg'on to Wyoming and Colorado and south into 

 Mexico (fig. 94). Oregon specimens are recorded by Miller and 

 Allen from Fremont, Paulina Lake, Silver Lake, and Ironside, while 

 others from southeastern Washington, western Idaho, and northern 

 Nevada would indicate a range over all of arid eastern Oregon. A 

 specimen in the Jewett collection from Sageview in Harney County 

 seems to be of this form. 



General habits. At Paulina Lake, L. J. Goldman collected 4 of 

 these bats on August 14 and 16, 1904, shooting them as they flew 

 over the water of the lake in the evening twilight. All were males, 

 indicating a colony of males in the vicinity. On August 22, 23, and 

 24 at Fremont, a little farther south, he collected 4 more specimens 

 all females. This probably indicates a breeding colony in the vicin- 

 ity, as the sexes of bats are generally well segregated during 1 the 

 breeding season. A female collected at West Silver Creek on Sep- 

 tember 2 may have belonged to this same colony. Other records for 

 Oregon are based on a specimen taken by Anthony at Ironside in 

 northern Malheur County, and 1 taken by Jewett near Sageview in 

 Harney County. So little is known of the specific habits of this 

 species that every record should contribute a valuable bit of infor- 

 mation. 



MYOTIS CALIFORNICUS CALIFORNICUS (AUDUBON AND BACHMAN) 

 LITTLE CALIFORNIA BAT 



Vespertilio californious Audubon and Bachman, Acad. Nat. Sci. Phila., Jour. (1) 

 vol. 8 (pt. 2) : 285, 1842. 



Type locality. California. No type specified. 



General characters. Size very small, with tiny feet; ears relatively large, 

 reaching beyond tip of nose when laid forward; color of upper parts bright 

 tawny ; lower parts pale tawny or buffy ; ears and membranes brownish black. 



Measurements. Total length, about 80 mm; tail, 40; foot, 6.4; ear, 11.6; 

 forearm, 30; spread of wings, 219. Weight of adults 3.7-5 g (Grinnell, 

 1918, p. 251). 



Distribution and habitat. From Sonora and Baja California 

 northward in the deserts and interior valleys to eastern Oregon and 

 southeastern Washington (fig. 95). Oregon specimens are recorded 

 from Blue River, Mount Hood, Sisters, Elgin, Wallowa Lake, Silver 

 Lake, and Crown Rock (on the lower John Day River). The speci- 

 mens from west of the Cascades are more or less intermediate in 

 characters. 



These tiny, bright-colored bats are undoubtedly distributed over 

 most of eastern Oregon, although few specimens have been taken, 

 and these mainly in Transition Zone localities. 



General habits. The scarcity of specimens does not mean that 

 the bats are scarce. In this case it means that they are small, quick, 

 and crooked fliers, not colonial in habits (at least not so in summer) , 

 and not easily procured by even the most skillful collectors and 

 expert wing shots. Among other species of small bats, indistinguish- 



