NO. 5 MAMMALS OF PANAMA — GOLDMAN 217 



Genus DASYPTERUS Peters 

 The genus Dasypterus is similar externally to Nycteris, but the 

 hind limbs and the posterior part of the interfemoral membrane are 

 naked. The skull indicates alliance to Nycteris, but the absence of 

 the small anterior upper premolars still appearing- in that genus is 

 distinctive. The teeth are 30 in number. 



DASYPTERUS EGA PANAMENSIS Thomas 



Panama Short-eared Bat 



Dasypterus ega panamensis Thomas, Ann. Mag. Nat. Hist., Ser. 7, Vol. 8, 

 p. 246, September, 1901. Type from Bugaba, Chiriqui, Panama (altitude 

 800 feet) . 



The type in the British Museum is the only known specimen of 

 this bat. It was collected at Bugaba in western Panama by H. J 

 Watson, October 8, 1898. It is described as dark brownish clay 

 color in general tone above, instead of buffy white as in typical 

 Dasypterus ega of Brazil. The forearm measurement given is 

 46.5 millimeters. 



Bats of the genus Dasypterus appear to be rare in Middle America. 

 They may be recognized by the rather unusual color among bats, 

 together with the short rounded ears, and the long tail which sup- 

 ports the gradually narrowing interfemoral membrane to a point 

 well beyond the feet. Another Middle American form, D. ega 

 xanthinus Thomas has been described from Lower California. 



Genus RHOGEESSA H. Allen 



The genus Rhogeessa is similar externally to Myotis, but the 

 yellowish brown color and small size sufficiently distinguish the 

 Isthmian representative. The skull more nearly resembles that of 

 Eptesicus in form, but the single pair of upper incisors and other 

 details are distinctive. The teeth are 30 in number. 



RHOGEESSA TUMIDA H. Allen 



Little Yellow Bat 



Rhogeessa tumida H. Allen, Proc. Acad. Nat. Sci. Philadelphia, 1866, p. 286. 

 Type from Mirador, Vera Cruz, Mexico. 



The small size, slender form, tiny foot, and naked interfemoral 

 membrane together with rich yellowish brown color characterize this 

 species, one of the smallest bats occurring in Panama. The forearm 

 measures about 31.5 millimeters. 



