MAMMALS OF MINNESOTA. 35 
Vespertilio pulverulentus TEMMINCK. Monog. Man., 1835. 
LECONTE. Proc. Acad. Sci., Phila., 1855. 
Max. Vv. WIED. Archiv. Naturg., 1861. 
Scotophilus noctivagans H. ALLEN. Monog. N. A. Bats., 1864. 
J.A. ALLEN. Cat. Chir., 1869. 
Vespertilio ( Vesperides) noctivagans COUES. Surv. 100th Mer. Zool., 1875, 
Lasionycteris noctivagans DoBSON. Cat. Mam., Mass., 1878. 
Never having seen a specimen of the silvery-haired bat from 
Minnesota, I simply quote the description given in Allen’s 
monograph: 
‘‘Head flat, broad and moderately haired; snoutnaked; nos- 
trils wide apart, and opening sublaterally; space between 
emarginate. Sides of face slightly swollen. The auricleisan 
irregular oval. The inner border extends upwards and in- 
wards to a level with the top of the head, and then turns up- 
wards and outwards, ending in an obtuse point. The outer 
border is smooth, and terminates inferiorly and internally in a 
thin ridge near the angle of the mouth. The lower half of this 
border folds irregularly upon itself, and bends so markedly 
inwards as to touch the tragus. The tragus is straight inter- 
nally, strongly and abruptly convex externally, narrow at its 
base. Itis but one-third the hight of the auricle, and nearly 
as broad as high. Skin of face and ears blackish, with the ex- 
ception of the internal basal lobe of the latter, which is whitish. 
_Fur long and silky, with a marked tendency to become black, 
and in many specimens the extreme tip of each hair is the only 
part possessing a different hue—it being pale gray or white. 
The fur is thicker on the back than in front, but the coloration 
is very similar. The posterior part of the interfemoral mem- 
brane is thinly covered with short dark colored hairs; the an- 
terior surface has upon it numerous minute tufts arranged 
linearly. Thumb small, foot moderate. 
Dentition 7%. 2, c. +, m. 2x 2—36. 
Upper incisors closely approximate to but not touching ca- 
nines, nearly of the same length; median pair bifid, twisted on 
their axes so that the two cusps have a somewhat antero-pos- 
terior arrangement; internal cusp slightly longer. Lateral 
pair unicuspid with a basal cusp. Canines simple and moderate. 
First premolar very small, unicuspid, second premolar with a 
very long external and short internal cusp. 
In the lower jaw the incisors are not crowded, trifid. Three 
premolars, of which the second is smallest. 
