A MONOGRAPH OF TPIE BATS OF- NORTH AMERICA. 187 



r. criitlirodactylus. — Less than the V. 2)ipintrellus. The forearin, base of fingers, 

 and the intcrdigital membrane of the first finger is reddish, the other membranes 

 are bhick. Ears haired from their base the greater portion of tlieir height, small, 

 ovoidal. Tragns, subulate; tail very long, point free; interfemoral membrane 

 haired above; beneath the liairs are arranged along the veins; it is of a sili<y text- 

 ure, verj' short, and sparingly distribat(>d. Incisors, 4, m pairs above and (5 below. 

 Five molars in all; only one false molar in the upper jaw. 



Fur long, fine, and silky; above tricolored, beneath bicolored. All the superior 

 parts of a faint brownish red, but a little yellow about the head and neck; the 

 liairs are black at their base, afterwards yellow, and the tip brownish red, superior 

 part of interfemoral membrane very furry; beneath brown at base and brownish red 

 at tip; the sides of the interfemoral covered with sparse hairs. 



Length of tail, 2 inches 10 lines, or 3 inches maximum, tliat of tail 1 inch 4 lines; 

 forearm, 1 inch 2 lines; expanse of wing membrane, 7 inches 6 lines, or 8 inches 

 maximum. 



The Museum du Pays Bas possesses many individuals of this supposed new 

 species, for which we are. indebted to Prince de Musignano; these specimens are' 

 preserved in alcohol, and are part of the same invoice as the preceding species. 

 Teap. calcaratas, indicated bj*^ M. Rafinesquc, has the wing' membranes about the 

 fingers red above ; but it is much larger and the coloration of the fur is considerably 

 d ifterent. 



Hah. — North America, about the environs of Philadelphia. 



V. fernirjineus. — Style of J', (hiitbeiitoini, of Europe. Nose short, obtuse; ears nar- 

 row, a little scooped out on the posterior border and towards the tip; tragus short, 

 subulate. Tail very long, point free, the basal portion covered witli hair; the claws 

 of the hind feet are of a whitish yellow. Upper incisors 4, in pairs, internal long 

 "biseam" at point; the external short, bifurcated; inferior incisors 6. Upper 

 molars 4; lower 5, with one false molar. 



Hair short, smooth, bicolored; above the color of a dead leaf, or more or less 

 reddish ; the base of the hair is of a brownish black beneath ; all the hair at its 

 base is of a faint blackish red, and the point pure white. These t^vo hues of the 

 hair form a sort of black and white mixture which is very conspicuous. The mem- 

 branes of the ears, having been immersed in alcohol, are of a brownish red. 



Total length, 4 inches or 2 lines longer, that of the tail 1 inch 9 lines; humerus, 

 1 inch; forearm, 1 inch 8 lines; anal expanse, 10 inches, or 6 lines longer. 



This species, based upon the examination of many alcoholic spiicimens, is new. 



Hah. Holland, Guiana. (Museum Paytt Bas: from the environs of Surinam.) 



Say. — Loii^^'s Expedition to the liocky Mountains, II, 18li3, 05, note. 



Vespertilio siibnhiiiis. — A small bat was shot this evening, during the twilight, as 

 it fiew ra])idly in various directions over the surface of the creek. It appears to be 

 an immature specimen, as the molars are remarkably long and acute; the canines 

 are very much incurved, and the right. inferior one is singularly bifid at tip, the 

 divisions resembling short bristles. This species is beyond a doubt distinct from 

 the Carolina bat ( F. carolhiiava, Geoft'.), with which the ears are proportionally 

 equally elongated, and, as in that bat, a little A'entricose on the anterior edge, so as 

 almost to extend over the eye, but the tragus is much longer, narrower, and more 

 acute, resembling that of V. emarfiinafus, Geott'., as well in form as in proportion to 

 the length of the ear. We call it V. suhuhitus, and it may be thus described— Ears 

 longer than broad, nearly as long as the head, hairy on the basal half, a little veu- 

 tricose on the anterior edge, and extending near to the eye; tragus elongated, subu- 

 late; the hair above blackisli at base, ti)) dull cinereous; the interfemoral membrane 

 hairy at base, the hairs uuicoloured, and a few also scattered over its surface and 



