VOL. XV, pp. 245-246 DECEMBER 16, 1902 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



TWO NEW TROPICAL OLD WORLD BATS.* 

 BY GERRIT S. MILLER, JR. 



Among the Old World bats in the United States National 

 Museum are representatives of two forms of Molosnidae that 

 have not hitherto been described. Both are insular represent 

 atives of well known continental species. 



Nyctinomus pusillus sp. nov. 



Type. Adult female (in alcohol), No. f^fff, United States National 

 Museum. Collected on Aldabra Island, Indian Ocean, by Dr. W. L. 

 Abbott. 



Characters. Externally similar to Nyctinomua pumilus. Skull and 

 teeth noticeably smaller than in the related species. 



External features. In size as well as in details of external form Nyctino 

 mus pusillus agrees so closely with N. pumilus as to need no description. 



Skull and teeth. The skull is similar to that of N. pumilus except that 

 it is smaller and more lightly built, the interorbital profile is more con 

 cave, the basisphenoid pits are better defined, and the interpterygoid 

 space is relatively wider. Teeth much smaller than in N. pumilus and 

 inner segment of upper molars relatively broader, so that the protocone 

 and hypocone of the first and second are actually further apart than in 

 the larger species. 



Measurements. External measurements of type : total tength, 84 ; 

 head and body, 53 ; tail, 31 ; tibia, 11 ; foot, 7.8 (7) : forearm, 46.6 ; first 

 digit, 6.4 : second digit, 35 ; third digit, 70 ; fourth digit, 58 : fifth digit, 

 34; ear from meat us, 15.4 ; ear from crown, 10 ; width of ear, 14. 



*Published here by permission of the Secretary of the Smithsonian 

 Institution. 



49-BiOL. Soc. WASH. VOL. XV, 190%', (5M5) 



