Two Species of Plecotus. 



Incisors -|- canines -^- molars ^ =36. 



Total length 3.4 inches. 



Ears, (in the dried sp.) ------- 1.0 



Tail 1.7 



Fore arm ----------- 1.6 



Tibia 0.8 



Spread 10.0 



The Yespertilio Maugei of Desmarest, described from a 

 specimen brought from Porto Eico by Mauge, appears from 

 his description greatly to resemble this above described. The 

 discrepancies, which may be owing to his having only a pre- 

 served specimen, are nevertheless too great to allow us to 

 admit their identity without great doubts. Major Le Conte 

 procured it in Georgia, where it appears to be tolerably com- 

 mon, and Dr. Bachman has also sent it to me from Charleston. 



Clayton's " Bat with long hair and great ears " appears to 

 be this species. 



The name macrotis I have ventured to supersede, as being 

 in nowise distinctive of the species, but in reality derived from 

 a generic character, which, in some species is still more devel- 

 oped than in the present. The ears being therefore rather 

 small for the genus, this name becomes contradictory ; and no 

 American naturalist will regret the opportunity thus afforded 

 of paying a well merited tribute to the discoverer of so many 

 rare and remarkable animals of this country. 



2. Plecotus Townsendii. 



Plate 3. Fig. 6, the head. 



Description. 



Fur on the back dusky at base, brown at the tips, with a 

 ferruginous cast, the two tints appearing nearly uniform, and 

 VOL. iv. 10 



