As M. d’Orbigny has not yet published the character of his genus _Edostoma_, his figure is my only guide, and in this figure I find the dentition agreeing both with that of the present species, and that of the genus _Desmodus_ of Prince Maximilian,—as would appear from the published descriptions, and figure given by M. de Blainville[3].—The points of distinction between M. d’Orbigny’s animal and the species here described, are not, in my opinion, of sufficient importance to constitute generic characters, I have, therefore, retained the name of Desmodus. It is desireable perhaps to separate the Blood-sucking Bats from the Insectivorous species, and place them between the latter group and the _Pteropina_, (with which they agree in the large size of the thumb and the rudimentary interfemoral membrane,) under a sectional name, which I propose to call _Hæmatophilini_. 1. PHYLLOSTOMA GRAYI. PLATE II. _P. fusco-cinereum; nasûs prosthemate lanceolato; auribus mediocribus, trago basin versus extùs unidentato; caudâ gracillimâ, brevi, et membranâ interfemorali inclusâ; verrucâ complanatâ ad apicem menti, verrucis parvulis circumdatâ._ DESCRIPTION.—This Phyllostoma agrees with the species described by Mr. J. Gray[4] under the name of Childreni, in having on the lower lip “an half ovate group of crowded warts,” but is of a much smaller size, and differs also in colour. The number of teeth are as follows:—incisors ⁴⁄₄; canines ²⁄₂; molars 5⁵⁄₅–5 = 32. The intermediate pair of incisors of the upper jaw are large, compressed, and have their apices rounded; the lateral pair are so minute, that they are scarcely visible without the assistance of a lens: the four incisors of the lower jaw, are somewhat crowded, the intermediate pair are slightly larger than the lateral; they are all deeply notched, and broad at the apex. The cerebral portion of the skull is much arched and the anterior portion is depressed. The zygomatic arch is imperfect; see Pl. 35. figs. 2. The nose-leaf is lanceolate, and of moderate size: the ears are also of moderate size; they are rounded at the tip and emarginated on their exterior edge: the tragus is elongated, and suddenly attenuated towards the apex; the outer margin is deeply notched towards the base, and very obscurely crenulated above this notch. The interfemoral membrane is of moderate extent, and emarginated posteriorly. The tail, which is very slender, is entirely enclosed by the interfemoral membrane, and the visible portion appears to consist of but two joints, which together, measure about two and a half lines in length. The basal half of the thumb is enclosed in membrane. The fur is soft and rather long. The general tint of the upper and under parts of the body is