VOL. XI, P. 139 MAY 13, 1897 



PROCEEDINGS 



OF THE f 



BIOLOGICAL SOCIETY OF WASHINGTON 



DESCRIPTION OF A NEW BAT FROM MARGARITA 

 ISLAND, VENEZUELA. 



BY GERRIT S. MILLER, JR. 



Through the kindness of Mr. F. W. True, curator of mammals 

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

 ine the bats collected by Lieut. Wirt Robinson on Margarita 

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

 of Rhogeessa which differs considerably from any of the Mexican 

 species of the genus, and without doubt represents an unde- 

 scribed insular form. It may stand as : 



Rhogeessa mimitilla sp. nov. 



Vesperugo parrulus Robinson, Proc. U. S. National Museum, XVIII, p. 

 651, 189(5. 



Type from Margarita Island, Venezuela. No. 63216, ^ ad., U. S. 

 National Museum. Collected July 8, 1895, by Lieut. Wirt Robinson. 

 Collector's number, 463. 



General characters. Most like lilwgeessa tnmida H. Allen, but much 

 smaller. 



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

 back tipped with chestnut ; ears and membranes in dry specimen dark 

 brown. 



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

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

 the cranial characters cannot be determined with certainty. Teeth essen 

 tially as in R. tumida. 



Measurements. Total length, about 65; tail vertebrae, 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 BIOT,. Soc. WASH., VOL. XI, 1897 (139) 



