AMERICAN BATS — HANDLE Y 191 



Mountains, Great Basin, Mohave and Colorado Deserts, etc., but 

 excluding the northwestern coast region (fig. 22). North to Stanley 

 and Harding Counties, S. Dak.; Powder River and Yellowstone 

 Counties, Mont.; Yellowstone National Park, Wyo.; Riske Creek 

 and Williams River, British Columbia. West to Riske Creek and 

 Wniiams River, British Columbia; Okanogan and Yakima Counties, 

 Wash.; Harney County, Oreg.; Siskiyou, Tehama, Placer, Tulare, 

 and Kern Counties, Calif., and the coast and Channel Islands of 

 California south of Point Conception. South to San Diego and 

 Imperial Counties, Calif.; northern Baja California, northern Sonora, 

 and northern Chihuahua, Mexico; Dona Ana County, N. Mex.; 

 Culberson, Presidio, Brewster, Val Verde, and Edwards Counties, 

 Tex. East to Val Verde and Edwards Counties, Tex. ; Eddy County, 

 N. Mex.; Cimarron County, Okla.; El Paso, Boulder, and Larimer 

 Counties, Colo.; Custer and Stanley Counties, S. Dak. An appar- 

 ently isolated population inhabits the gypsum cave region in south- 

 central Kansas, central Oklahoma, and north-central Texas fspeci- 

 mens from Barber and Comanche Counties, Kans., south to Garza 

 County, Tex. Zonal distribution: Most numerous in Upper Sonoran 

 and Transition zones, but also occurs at the upper edge of the Lower 

 Sonoran and the lower edge of the Canadian. Altitudinal distribu- 

 tion: Sea level (possibly below sea level in southern California) to 

 9,600 feet. 



Description: Adult coloration: Mass effect of upperparts averages 

 between Sayal Brown and Cinnamon; hair bases Light Cinnamon- 

 Drab to Benzo Brown. Hair bases of underparts average between 

 Fawn Color and Benzo Brown ; tips between Light Pinkish Cinnamon 

 and Pinkish Buff. Distinction between bases and tips of hairs usually 

 everywhere slight. Immature coloration: Mass effect of upperparts 

 between Drab and Cinnamon-Drab ; hair bases slightly grayer. Hair 

 tips of underparts "dirty" white; bases Benzo Brown to Light Mouse 

 Gray. 



Size averages medium for the subgenus ; forearm averages relatively 

 long; skull relatively light in construction; rostrum averages relatively 

 long, not particularly depressed, and not inflated; anterior nares 

 average relatively small and angular in posterior outline (dorsal view) . 

 Canine relatively strong; secondary cusp on I^ usually absent; 

 anterointernal cingular cusp of P* frequent. 



Measurements: See tables 11, 17. 



Comparisons: In coloration of fur, membranes, and ears P. t. 

 pallescens is the palest and most yellowish known population of the 

 species. 



For comparison with related subspecies see accounts of P. t. 

 australis (p. 187), P. t. ingens (p. 190), and P. t. townsendii (p. 198). 



497256—59 7 



