54 Five Sjiccics of Vcsjiertilio. 



scriptions and comparisons than have been heretofore given, to 

 enable the student to determine them with as little difficulty as 

 their close resemblance will permit. The materials for doing 

 this have been derived partly from my own researches during 

 several years past, and partly from the liberal communications 

 of my friends, especially Major Le Conteof this city, the Rev. 

 Dr. Bachman of Charleston, and Doctors Pickering and Mor- 

 ton of Philadelphia. Through their assistance I have likewise 

 been enabled to make some interesting observations relative to 

 other groups of this family, which I propose to communicate 

 as I find opportunity to prepare them for publication. I hope 

 in this manner to lay the groundwork for a complete account 

 of the Cheiroptera of the United States, which however much 

 to be desired, I have not at present the requisite materials to 

 undertake. 



1. Vespertilio PltUINOSUS. 



Vespertilio pruinosus, Say in Long's Exp. I. p. 168. Richard- 

 son, Fauna Bor. Am. I. p. 1. 



Nycticcius tesselatus, Rap. ? 



Hoary Bat, Godman, Am. Nat. Hist. I. p. 68. PI. I. fig. 3.Rich. 

 I.e. 



Description. 



In the general appearance of the upper parts it much re- 

 sembles the common Red Bat, though more variegated in 

 color. The ears are of moderate size and rounded, hairy 

 above next the head, with a naked anterior lobe ; the inside 

 also hairy, except on the outer portion and round the border ; 

 tragus hairy, irregularly triangular, obtuse and arquated, with 

 the outer angle curved forward and the inner attached. About 

 the ears and front the color of the fur is a pale tawney, the 

 remaining upper parts of the body including the flanks and 

 interfemoral membrane, except a narrow edging round the 

 latter, of a dark ferruginous, intermixed with dusky black on 



