ROUSSETTES with a small tail: four incisors in each jaw. These comprehend all the species described for the first time by M. Geoffroy. One of them, woolly and grey, (Pier. Egyptiacus,) lives in Egypt in the catacombs, vaults, &c. Another of a reddish hue, with a tail somewhat longer, and to a certain extent involved in the membrane, (Pter. Amplexicandus,) Geoff. Ann. Mus. t. XV. pl. IV., comes from the Archipelago of the East Indies, &c. To these may be added, the Pteropus Griseus, Geoff. Ann. Mus. tom. XV. pl. vI.; Pteropus Stramineus, Seb. I. LVII. 1, 2,; Pteropus Marginalus, Geoff. loc. cit. pl. v.; Pteropus Minimus, id.

3. Following the relations pointed out by M. Geoffroy, we shall moreover separate from the Roussettes the Cephalotes, which have cheek-teeth of the same character, but in which the index or fore-finger, though short and furnished like the preceding species with three phalanges, is, however, without a nail. The membranes of their wings, instead of being joined to the flanks, are both of them united together on the middle of the back, to which they adhere through the medium of a vertical and longitudinal partition. Very frequently they have but two incisors.

The CEPHALOTES of Peron, (Cephalotes Peronii, Geoff. Geoff. Ann. Mus. XV. pl. iv.

Brown or red. Habitat, Timor.

When the Roussettes have been thus detached

there will remain the genuine bats, which are all insectivorous, and all of which have cheek-teeth furnished with conical points. The index is never provided with a nail; and, with the exception of a single sub-genus, the membrane always extends between the two legs.

They must be divided into two principal tribes. The first has upon the middle finger of the wing three ossified phalanges, but the other fingers, and the index itself has but two.

To this tribe, which is altogether foreign, belong three sub-genera.

The MOLOSSI, (MOLOSSUS, Geoff. Dysopes, Illiger.) Have a simple muzzle; ears large and short, origi nating from the angle of the lips, and uniting one to the other upon the muzzle; the parotis short, and not enveloped by the conch. We reckon but two incisors in each jaw. Their tail takes up the whole length of the interfemoral membrane, and often extends beyond it. All the species come from America, and are more or less brown. They were confounded by Gmelin under the common name of Vespertilio Molossus, but M. Geoffroy has already distinguished nine species, of which Buffon has only three, viz., the Molossus longicaudatus, the Molossus fusciventer, and the Molossus Guyanensis. The description of the others will be found in the Ann. du Mus. VI. 150.

The NYCTINOMES (Geoff.)

Have four incisors below; the upper lip is high, and

considerably sloped. In other particulars, they resemble the Molossi. To these belong the Nyctinome of Egypt, Geoff. Eg. mammif. 2, 2; Vespertilio acetabulosus, Herm. Obs. Zool. p. 19; Vespertilio plicatus, Buchannan.

The STENODERMES, (Geoff.)

The muzzle is simple, the interfemoral membrane sloped as far as the coccyx. The tail is wanting, and there are two incisors above and four below.

The NOCTILIONS, (Noctilio, Linn. Ed. XII.)

With a short muzzle, inflated, divided, and marked by warts and curious furrows. The ears are separated. They have four incisors above and two below. The tail is short, and unconnected above the interfemoral membrane.

There is but one species known, which belongs to America, and is uniformly of a pale fawn-coloured tint.

The PHYLLOSTOMES, (Phyllostoma, Cuv. and Geoff.)

The regular number of incisors is four in each jaw, but from the lower some of these teeth frequently drop out, being pushed aside by the growth of the canines. These animals are also distinguished by the membrane which, in the form of an upturned

leaf, crosses the termination of their noses. The tragus of their ear resembles a little leaf, more or less indented. The tongue, which is capable of great

elongation, is terminated by papillæ, which seem to be arranged so as to form an organ of suction, and their lips also are provided with tubercles symmetrically disposed. All this tribe is American; they run on the earth with more facility than the other bats, and are accustomed to suck the blood of other animals.

1. PHYLLOSTOMES without a tail.

The Vampire, (V. Spectrum, L.) Andira Guaçu of Brasil. Seb. LVIII. Geoff. Ann. Mus. XV. x11. 4.

The leaf is oval and hollowed in the form of a tunnel. This animal is reddish brown and about the size of a magpie. Habitat, South America. It has been accused of destroying men and animals by sucking their blood. But the truth appears to be, that it inflicts only small wounds, which may probably become inflammatory and gangrenous from the influence of the climate. We may here add the Lunette, (Vespertilio perspicillatus, L.) spear-nosed bat. And three species given after Azzara, by M. Geoff. Ann. du Mus. XV. 181, 182.

2. PHYLLOSTOMES, with a tail involved in the interfemoral membrane.

Javelin Bat, (Vesp. Hastatus, L.) Fer de Lance, Buff. XIII. XXXIII.

The membrane of the nose very much resembles a javelin, or leaf of trefoil.

Here may be added Vespertilio Soricinus, (Anglicė leaf-nosed bat), Pall. Spic. Zool. fasc. III. pl. 111. IV., cap. Schreb. XLVII.

3. PHYLLOSTOMES, with a tail unconnected above the membrane.

The indented Javelin Bat, (Ph. crenulatum, Geoff)

The leaf of the nose is formed like a javelin, indented or furrowed at the side.

The second great tribe has but one ossified phalanx on the index, and the other fingers have each of them two.

This tribe is also divided into numerous subgenera.

The MEGADERMES, (Geoffr. Ann. du Mus. XV.)

These bats have on the nose a leaf more complicated than that of the Phyllostomes. The parotis is large, and most frequently forked or cloven; the shells or conchs of the ear are extremely ample and are united to each other on the summit of the head; the tongue and lips are smooth; the interfemoral membrane is entire, and there is no tail. They have four incisives below, but none have as yet been discovered above, and it would appear that their intermaxillary bone remains cartilaginous.

They all belong to the ancient continent, and are either African, as the Feuille (Mega. Vons. Geoffr.), with an oval leaf to the nose, almost as large as the head of Senegal, or of the Indian Archipelago, as