Vol. XI, p. 139 May 13, 1897 



PROCEEDINGS 



OF THE / \^'*^ 



BIOLOGICAL SOCIETY OF WASHINGTON 



DESCRIPTION OF A NEW BAT FROM MARGARITA 

 ISLAND, VENEZUELA. 



BY GERRIT S. MILLER, Jk. 



Throuuli the kindness of ]\h-. F. W. True, curator of nianiinals 

 in the U. S. National Museum, I have heen permitted to exam- 

 ine the bats collected b}' Lieut. A\'irt Robinson on Margarita 

 Island, Venezuela, in July, 1895. Among them is a specimen 

 of Rhogehsa which differs considerably from an}^ of the Mexican 

 species of the genus, and without doul)t represents an unde- 

 scribed insular form. It may stand as : 



Rhogeessa minutilla sp. nov. 



Vespfnujn parruhts Robinson, Proc. U. S. National Museum, XVIII, p. 

 051', 1890. 



Ti/pe from INIargarita Island, Venezuela. No. ()3216, (J* ad., U. S. 

 National Museum. Collected July 8, 1895, by Lieut. Wiit Rol)inson. 

 Collector's number, 463. 



General characters. — Most like MJiogeissa turnida H. Allen, but much 

 smaller. 



Color. — Fur everywhere liyjlit yellowish brown to base, the hairs on the 

 back tipped with chestnut ; ears and meniljranes in dr}- specimen dark 

 brown. 



Skull and teeth. — The skull of Rhogeessa minutilla is smaller than that of 

 R. inmuhi, and apparently has a narrower brain case ; but as it is injured, 

 the cranial characters cannot be detei'mined with certainty. Teeth essen- 

 tiall}' as in R. tumkla. 



Measurements. — Total length, about 05; tail vertebree, 25; tibia, 11; 

 foot, 5; forearm, 25; thumb, 3.6; longest finger, 51; ear from meatus, 

 11.8; width of ear, 8; tragus, 6.4 ; greatest length of skull, 11.8; upper 

 tooth row, 5; lower tooth row, 5.6; mandible, 9. 



31— Kioi,. Soc. Wash., Vol. XI, 1897 (139) 



