MAMMALS OF UTAH 163 



about 5 mm. of tip of tail. Free border of uropatagium 

 naked. Ears moderate, reaching just beyond tip of nose.. 

 Wmgs from base of toes. Fur on back distinctly darker at 

 base than at tip. The fur is soft, full and long, that on 

 middle of back averaging about 8 mm. in length. Color light 

 yellowish gray paler on the belly, the fur everywhere dark 

 plumbeous at base. Membranes, ears, lips, and muzzle 

 blackish. (Miller.) 



Distribution — ^Austral zones and lower part of Transi- 

 tion zones throughout the western United States and Lower 

 California, east to Wyoming and Texas. 



TRUE'S BAT: LITTLE BROWN BAT 



MYOTIS LUCIFUGUS LONGICRUS (True) 



Vespertilio longlcrus True, Science, VIII, p. 588, 1886. 

 Vespertilio nitidus longicrus H. Allen, Monogr. Bats N. Am., 



p. 103. 

 Vespertilio Albescens (melanic phase) H. Allen, Monogr. Bats 



N. Am., p. &2. 



Description — The fur shows no peculiarities in distri- 

 bution. In color it is darker and duller than in the typical 

 subspecies but the difference is apparently never very strik- 

 ing. (Miller.) Above dark ; underparts paler, with grayish 

 cast ; base of hair above and below blackish ; ears and mem- 

 branes look blackish, though brown by transmitted light. 

 (Warren.) 



Distribution — Boreal and Transition zones fi:om Puget 

 Sound east to Wyoming south at least to Arizona and south- 

 ern California. 



Habits — This is a cave bat though hollow trees and 

 farm houses are sometimes occupied by it. It flies quite 

 like a chimney swift. Its voice is so delicate that some 

 people with good hearing cannot hear it. The mating season 

 of this species is August and early September; and the 

 period of gestation is about ten months. Usually two young 

 are raised ; and it is said the mother carries them with her 

 until they: are about two weeks. old. 



The food of this species consists of insects, which it 

 catches on the wing. Bats go twice or three times a day for 

 water, being drinkers. An annual migration takes place 

 though at times the species hibernate for a period of inclem- 

 ent weather. 



