CO Five Species of VespertUio. 



Incisors -^- canines -l^j- molars -^3- = 34. 



Total length 3.8 inches. 



Tail - - 1.5 " 



Fore arm ---------- 1.8 " 



Tibia ----- 0.8 " 



Spread - - 11.0 " 



This species is easily recognised at sight by its dark black- 

 brown fur tipped with white on the back, and it cannot be con- 

 founded with any other of our Bats by the most heedless 

 observer. It was first described in the year 1831, both by 

 Major Le Conte and Dr. Harlan. The preface to the volume 

 in which the former gentleman's description appears is dated 

 in June ; that of the latter is contained in the Journal of Ge- 

 ology for November of the same year. These dates are my 

 only guide in deciding the claim to priority in favor of Major 

 Le Conte, by adopting his name for this species. 



The Silver-haired Bat is rare in our vicinity, and I have 

 only obtained it from Long Island, where it is found during the 

 day in hollow trees. I have seen a considerable number, which 

 were remarkably uniform in their appearance. They are pro- 

 bably more common in the southern states, where they have 

 been observed by Major Le Conte. 



4. Vespeutilio cakolinensis. 



Vespertilio carolinensis, Geoffroy St. Hilaiiie, in Ann. du 

 Museum, 8 p. 193, sp. 2. figs, of the head and cranium pis. 

 47 and 48. Le Conte, in App. to Mc Murtrie's Cuv. I. p. 

 431. 



Description. 



Ears large, naked, except near the head, and with a broad 

 and obtuse tip curving outwards ; emarginate on the outer 

 posterior edge, tragus nearly a line broad, linear and obtuse, 



