Vol. XXIV, pp. 25-28 February 24, 1911 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



DESCRIPTIONS OF SIX NEW MAMMALS FROM THE 

 MALAY ARCHIPELAGO. 



BY GERRIT S. MILLER, JR. 



[By permission of the Secretary of the Smithsonian Institution.] 



The large collection of Malayan mammals in the United 

 States National Museum includes representatives of the follow- 

 ing six forms, none of which appears to have been previously 

 described. 



Pipistrellus curtatus sp. nov. 



Type.— Adult female (in alcohol) No. 141,019, U. S. National Museum. 

 Collected on Engano Island, Sumatra, December 1, P)04, by Dr. W. L. 

 Abbott. Original number, 3785. 



Diagnosis. — Resembling the Javan Pipistrellus imbricatus, but ear larger, 

 muzzle shorter and crown area of anterior lower premolar much reduced. 



External characters. —Size and general form essentially as in P. imbri- 

 catus, but tail slightly longer and foot less robust. Membranes with no 

 special peculiarities, the wing inserted at base of outer toe. Calcar ter- 

 minating indistinctly, its posterior border with a slight keel that shows no 

 tendency to develop into a distinct lobe like that of P. imbricatus. Ear 

 extending a little beyond nostril when laid forward, its general outline 

 as in P. imbricatus but antitragus better developed. Head shorter and 

 broader than in the Javan species, its general outline when viewed from 

 above nearly circular, with slightly projecting, moderately tumid muzzle. 

 Color after six years immersion in alcohol apparently not so dark as in 

 P. imbricatus. 



Skull and teeth. — The skull is at once distinguishable from that of Pipis- 

 trellus imbricatus by the decided reduction of rostrum as compared with 

 braincase, a difference equally appreciable in dorsal or palatal view. 

 Palate so much shortened that length in median line is only about equal 

 to width between last molars. Audital bullae as in P. imbricatus. Basi- 

 sphenoid pits rather well defined. 



Teeth as in Pipistrellus imbricatus except that premolars are decidedly 

 more reduced; anterior upper premolar with crown area barely equal to 

 half that of outer incisor; crown area of anterior lower premolar slightly 



7— I'koc. Biol. Soc. Wash., Vol.. XXIV, 1911. (20) 



