brownish-ash; the hairs on the neck and on the whole of the back are grey at the base, then white, or nearly so, brownish-ash near the tip, and whitish at the tip. On the belly the hairs are nearly of an uniform brown-ash colour, their apices only being whitish. The ears, nose-leaf, and membrane of the wings, are of a sooty-black hue. In. Lines. Length of head and body 2 0 antibrachium 1 4⅓ thumb (claw included) 0 5½ tibia 0 7 ear 0 7 nose-leaf 0 3⅓ Expanse the wings of 10 0 Habitat, Pernambuco, Brazil. (_August._) “This species appeared to be common at Pernambuco (five degrees north of Bahia). Upon entering an old lime-kiln in the middle of the day, I disturbed a considerable number of them: they did not seem to be much incommoded by the light, and their habitation was much less dark than that usually frequented as a sleeping place by these animals.” D. I have named this species after Mr. John Gray, the author of several extensive memoirs on the order to which it belongs, and to whom I am indebted for valuable assistance whilst comparing this and other species with those contained in the collection of the British Museum. 2. PHYLLOSTOMA PERSPICILLATUM. I find in Mr. Darwin’s collection, a bat agreeing with the description of M. Geoffroy Saint Hilaire,[5] under the above name, with the exception of a slight difference in the dimensions; I will, therefore, add those of the present specimen, which is a female. It may be observed, that in the animal before me, the tragus of the ear is pointed, and not bifid at the apex, as represented in plate xi of the work quoted. In. Lines. Length of head and body 4 0 antibrachium 2 7 nose-leaf 0 5 ear 0 8½ tragus 0 3 tibia 1 0 Expansion the wings of 16 8 “This bat was caught at Bahia, (latitude 13° S.) on the coast of Brazil, in consequence of its having flown into a room where there was a light. I scarcely ever saw an animal so tenacious of life.” D. FAMILY—VESPERTILIONIDÆ.