Vol. XXIX, pp. 37-38 February 24, 1916 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



A NEW BAT FROM PORTO RICO. 

 BY HARTLEY H. T. JACKSON. 



The Biological Survey Collection contains 235 specimens of 

 bats obtained by Mr. Alex Wetmore while engaged in field work 

 in Porto Rico during the spring and summer of 1912. An 

 examination of this material reveals two specimens of an un- 

 described form of Eptesicus, which I take pleasure in naming 

 for the collector. The bat may be recognized by the following 

 diagnosis : 



Eptesicus wetmorei sp. nov. 



Type. — Young adult c?, alcoholic with skull removed, No. 179,142, 

 U. S. National Museum, Biological Survey Collection, from Maricao 

 (altitude 1375 feet), Porto Rico; collected May 29, 1912, by Alex Wet- 

 more. Original number 900. 



General characters. — Nearest to Eptesicus cubensis (Gray) from which 

 it dilfers externally in its slightly larger size, relatively larger ears and 

 longer tragi, and duller color. Skull slightly larger than that of cubensis; 

 relatively wider interorbitally and through braincase. Molariform denti- 

 tion heavy; much heavier than in cubensis. 



Color. — Upperparts duller than in Eptesicus cubensis ; about fuscous of 

 Ridgway.* Underparts much paler than upperparts; near olive-brown, 

 anteriorly, shading posteriorly into drab. Ears and membranes fuscous- 

 black. 



Measurements. — Type (measured in flesh by collector): total length, 



97; tail vertebrae, 41; hind foot, 12. Type (measured by writer from 



specimen in alcohol) : length of forearm, 46; length of tibia, 19.5; length 



of thumb, 8.5; length of ear from crown, 13; length of tragus, 7.5. 



• Ridgway, R. Color standards and color nomenclature, 1912. 



&— Proc. Biol. Soc. Wash., Vol. XXIX, 1916. (37) 



