FAMILY VESPERTILIONIDJi). 
7 
its dentition, and frequently in its external markings, even to the white spot at the insertion of 
the wings. Its strongest distinctive character is to be found in its general tawny hue, and 
the absence of a hairy patch at the elbow or first joint of the forearm. One of the specimens, 
which furnished us with the preceding description, is among the largest we have seen, ap¬ 
proaching very nearly in size to the hoary bat. 
The geographical range of this species, as far as it has yet been noticed, extends between 
the thirty-third and forty-second parallels of latitude, and from Massachusetts to the Rocky 
Mountains. According to Kirtland, it is comparatively a rare animal in Ohio. Except in the 
northern mountainous districts, it occurs in every part of this State. 
THE HOARY BAT. 
Vespertilio pruinosus. 
PLATE II. FIG. 2. —(STATE COLLECTION.) 
Vespertilio pruinosus. Say, Long’s Expedition to the Rocky Mountains, Vol. 1, p. 168. 
V. id. Harlan, Fauna Americana, p. 221. Godman, Am. Nat, History, Vol. 1, p. 68, figure 3. 
V. id. Richardson, Fauna Boreali Americana, Vol. 1, p. 1. 
V. id. Cooper, Ann. Lyceum N. Y. Vol. 4, p. 54. 
V. id. Wheatland, Essex Journal Nat. Hist. Vol. I, p. 76. Emmons, Mass. Rep. 1840, p. 8. 
Characteristics. Greyish above. Margin of the interfemoral membrane naked ; a small white 
hairy patch at the elbow and wrist above. Lips and chin black. Throat 
with a fawn-colored band. 
Description. Body robust. Ears broad, short and rounded ; naked on the superior margins, 
hairy within, and with a tuft of fawn-colored hair behind the anterior margin, which is broadly 
dilated and free at the base. Tragus or inner ear hairy externally, convex on its outer margin, 
concave on its inner margin, and terminating in an obtuse tip. Wing membrane naked above 
the small tufts noted in the specific phrase. Interfemoral membrane hairy, except along the 
external margins. Beneath, the humeral membrane is covered with dense hair except on the 
margin; at the insertion of the wings behind the humerus, there is a broad patch of hair 
extending to the elbow, and forming a band 0'4 broad, along the course of the forearm to 
the wrist; the remaining part of this membrane is naked. Forearm longer than the tail, 
which is entirely included in the membrane. Richardson, however, states that in the 
specimen which he examined, there was a very slight smooth projection of the tail. This 
may be the case in prepared specimens, but I have not noticed it in recent subjects. Tibial 
processes stout, and 0 - 8 long. Dental formula: Incisors, f ; canines, f; cheek teeth, 
a# = 34. 
Color. Upper part of the head, light yellowish; the parts surrounding the mouth and 
nose, deep blackish brown ; posterior part of the cars two colors, light yellowish at the 
base, black along the margins; internally there are short greyish hairs; margin black and 
naked, except on the portion near the nose, where there is a patch of short light yellowish 
