Five Species of Vespertilio. 59 



this season in the States of New-York and Pennsylvania. In 

 summer it is frequently discovered in woods suspended during 

 the day by its thumb claws to a twig behind a cluster of leaves. 

 Its habits are in other respects similar to those of its tribe. 

 The female is larger than the male, and produces four or five 

 young at a birth, though others of the genus are said to have 

 but one. 



V. borbonicus of Geoffroy is no doubt a very different spe- 

 cies, as well as V. lasiurus of Schreber, also figured by Geof- 

 froy, unless we suppose the ears to be very incorrectly repre- 

 sented by these authors. 



3. Vespertilio noctivagans. 



Vespertilio noctivagans, L. C. in App. to Mc Murtrie's Transl. of 



Cuv. R. An. I. p. 431. 

 Vespertilio Auduboni, Harlan, in Am. Monthly Jour, of Geo!. 



p. 220. pi. IV. 

 •Silver haired, or Audubon's Bat. 



Description*. 



Ears dusky black, rather large, naked on the anterior por- 

 tion, somewhat ovate and obtuse, with two emarginations on 

 the outer posterior border, produced by two plaits ; naked 

 within, and with the tragus moderate, ovate, and obtuse. Color 

 above, a uniform dark dusky brown approaching to black. On 

 the back the fur is somewhat glossy and tipped with silvery 

 white, forming an interrupted line across the shoulders, and 

 thence irregularly mixed down the centre of the back. Inter- 

 femoral membrane thickly hairy on the upper part, becoming 

 thinner downward and naked near the border. Tip of the tail 

 projecting about a line beyond the membrane. Feet hairy. 

 Wing membrane entirely naked. Beneath very similar to the 

 upper parts, though the light-colored tips of the hairs are more 

 yellowish. 



