AMERICAN BATS OF THE GENERA MYOTIS AND PIZONYX 29 



black-faced bat, with keeled calcar, inhabiting the eastern United 

 States (type from Plummer Island, Md.). It is, however, a 

 synonym of Vespertilio leibii based by Audubon and Bachman on 

 a specimen from Ohio many years before, a name whose allocation 

 has long been misunderstood on account of the apparent rarity of 

 the animal to which it was applied. 



Yumanensis (VespertUio) H. Allen, Smithsonian Misc. Coll., No. 

 165, p. 58, June, 1864. This name, based on specimens from Fort 

 Yuma, Calif., is the first one applied to the small, large-footed 

 Myotis of the western United States and Mexico. 



