5S 



XOHTII AMERICAN BATS. 



Tespertilio yiiinanensis, Allen. 



The Gila Bat. 



Fig. 54. Fig. 55. 



Description. — Head moderate, not depressed ; hairy. Ears 

 ellipsoid, very slightly emarginated on the outer border. Tragus 

 subulate, half the height of the ear, straight ou internal, convex 

 on external border. Nostrils elliptical, opening sublaterally ; space 

 between them naked, and slightly emarginated. Lips moderately 

 well covered with whitish whiskei's. Body slender. The feet are 

 large, the wing membrane attached midway to the base of the 

 toes. Interfemoral membrane triangular, the termination of the 

 ealcaneum forming a lobe with the membrane ; the point of tail 

 exserted. The thumb moderate. Wing membranes thin, light 

 color, aud almost diaphanous. 



The hair behind is plumbeous at base, and light brown at the 

 tip. That in front dark umber at base, and grayish-white at tip — 

 the white hue being predominant. The distribution of fur is the 

 same as in other, species. 



Dentition same as in V. evotis. 



In general appearance this bat resembles both V. suhulatus 

 and ScolopJiilus georgianus. It is, however, smaller than the 

 former, the membranes more delicate, the foot proportionately- 

 larger, the interfemoral membrane smaller ; but it agrees with it 

 in the sul)ulate tragus, and in the dentition. Its relation to S. 

 georgianus is seen in the light brownish snout and ear ; its vari- 

 ance therefrom in the longer and more acuminate tragus, the 

 smaller size of the thumb, and the difl'erence in the number of 

 molars. 



Hab. This species has not been received from any other locality 

 than the one above given. It was sent to the Institution, from 

 Fort Yuma, with the original type of Macrotus calif ot-nic us, by 

 Major (now Major-General) George H. Thomas, U. S. A. 



