Vol. XV, pp. 245-246 December 16. 1902 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



TWO np:w tropical old world bats." 



BY GERRIT S. MILLER, Jit. 



Among the Old World bats in the L^nited States National 

 Museum are representatives of two forms of Molossidfe that 

 have not hitherto been described. Both are insular represent- 

 atives of well known continental species. 



Nyctlnomus pusillus sp. nov. 



Type.— Adult female (in alcohol), No. UUf. United States National 

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

 Abbott, 



Characters. — Externally similar to Nyctinomv.s pinnUuii. Skull and 

 teeth noticeably smaller than in the related species. 



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

 mu8 punUvs agrees so closely with N. ptimilus as to need no description. 



Skull and teeth. — The skull is similar to thai of N. puwiluft 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 X. prnnih/s 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. 



Measvrements. — External measurements of type : total length, 84 ; 

 head and body, 53 ; tail. .31 ; tibia, 11 ; foot, 7.8 (7) : forearm, 40.6 ; first 

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

 34; ear from meatus, 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-'. (245) 



