94 Bulletin American Museum of Natural History. [Vol. XIII. 



A few specimens are practically intermediate and to some extent 

 connect the two phases. 



The white markings on the back vary much in distinctness in 

 different specimens, being sometimes almost clear white and 

 strongly defined, in other specimens brownish white, and some- 

 times obsolete. 



There are seven young, two of which are very young and the 

 others about two-thirds grown. These are nearly uniform blackish 

 plumbeous above, somewhat lighter below, with the hairs slightly 

 ashy- tipped. 



19. Saccopteryx leptura (Sehreber). Two skins and three 

 specimens in alcohol, Bonda, March, April, and June. 



20. Thyroptera tricolor Sptx. One skin, without skull, 



Cacagualito, May 24. 



21. Myotis nigricans (IVied). Nine specimens, Bonda, 

 June 14, July 24, August 14, and September 5. Three of the speci- 

 mens are paler and browner than the others, but they apparently 

 represent only a brownish phase of M. nigricans, as they do not 

 differ appreciably from the others except in color. 



22. Lasiurus pallescens (Peters). One specimen, Bonda, 

 July 6. 



This is slightly smaller than Dr. Peters's type, from the " Andes 

 de Merida" of western Venezuela, but apparently not otherwise 

 different. 



