MAMMALS OF UTAH 161 



WESTERN BAT 



PIPISTRELLUS HESPERUS (H. AUen) 



Scotophilus hesperus H. Allen. Mon. N. A. Bats, 1864, p. 43. 

 Vesperugo merriami Dobson, Cat. Chirop., Brit. Mus. 1878, 



p. 228. 

 Pipistrellus hesperus Elliot, Syn. N. Am. Mamm. F. C. M. 



Pub., II, 1901, p. 409. 



Description — Size very small ; thumb short, ears shorter 

 and more bluntly rounded than in other American members 

 of the genus reaching barely to nostril when laid forward. 

 The fur extends on basal third of ears but barely reaches 

 extreme base of interfemoral membrane, and on wing mem- 

 brances invades merely a very narrow strip close to the 

 body. Color light yellowish gray or whitish gray, the fur 

 everywhere deep plumbeous at the base. In some specimens 

 the hairs on the back have faint dark subterminal areas 

 which, however, are visible on close inspection only. Ears, 

 muzzle face and membrane black. A narrow whitish border 

 on wing membrane between foot and fifth finger. Foot 

 small, distinctly less than half as long as tibia, naked or with 

 a few almost invisible whitish hairs on dorsal surface. 

 (Miller.) 



Distribution — The western bat is found in the lower 

 Austral zone in the western United States from western 

 Texas to the Pacific coast. Specimens have been taken at 

 St. George, Utah. 



BROWN BAT 



VESPERTILIO FUSCUS (Beauvois) 



Vespertilio ursinus Temminck, Monogr. de Mammalogie, II, 



p. 235. 

 Vespertilio fuscus Beauv., Cat. Peale's Mus. Phil, 1796, p. 14. 

 Vespertilio carolinensis Geoff., Ann. Mus. Nat. Hist. Paris, 

 . ■ VIII, 1806, p. 193. 



Vespertilio phaiops Rafin., Am. Month. Mag., Ill, 1818, p. 445. 



Eptesicus melanops Eafin., Ann. Nat., 1820, p. 2. 



Vespertilio arquatus Say, Long's Exped. Rocky Mts., 1, 1823, 



p. 167 note. 

 Scotophilus greenii Gray List. Spec. Mamm. Brit. Mus., 1, 



1843, p. 30. 

 Eptesicus fuscus Beauv. Cat. Peale's Mus. Phil., p. 14. 

 Vesperugo serotinus var Vesperus fuscus Dobson. Cat. Chir. 



Brit. Mus., p. 193. 



Description — In color it is wood brown throughout, 

 paled below ; fur never silver tipped. Length 4A to 5 inches ; 

 tail 1% to 2 A inches ; forearm 1% to 1% inches. Weight of 

 an adult, one-half ounce. (Seton.) 



