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Show 636 DR. H. BURMEISTER ON A NEW DOLICHOTIS. [Dec. 7, long ; and two or three of the same kind, but somewhat shorter, stand over the eyes near the anterior angle. These organs are large, surrounded by narrow black naked margins, the upper margin furnished with a series of black bristles half an inch long, extending obliquely over the eye. The ears are placed 1 inch behind the eyes; and in front of each is a large naked blackish space descending to the neck. The external ear is 2 inches long, very broad at the base, deeply emarginate behind, and somewhat pointed above the emargination. The middle of the inside of the ear is bare ; but the whole margin and the outside are covered with short hair; black on the outside and white within, the margins fringed with black hair which is long and dense on the upper part of the circumference. The whole body of tbe animal is clothed with fine but simple hair, except the pads, already mentioned, and the tail-wart. The hair is generally one inch in length, becoming somewhat longer on the underside and gradually shorter on the legs, and very short on the feet and toes. The colour of the animal is like that of the Wild Rabbit, but somewhat more red-brown on the upper parts of the body, especially behind. The hair is whitish grey at the base, ringed with black in the middle, then of a clear yellow or reddish yellow, which is succeeded by a smaller black ring near the tips. The tips of the hairs are abruptly thinner than in the middle, and black. The whole underside from the breast between tbe fore legs to the anus, the inside of the legs, and the rump are white; the lips, throat, two small spots before and behind the eye, and a somewhat larger spot behind the ear are also white ; but the side of the head and the underside of the neck are clear reddish brown, especially the under portion of the cheeks between tbe lips and the ears. The iris is clear brown ; and the claws are black. The female has two teats in the inguinal region near the inside of the femur; and she seems generally to give birth to two young at a time, if she does not lose one, which, as is the ease with the Patagonian species, seems to be very common. Three individuals are therefore often found together, as the two sexes live in company and are accompanied by their young as long as it is dependent upon them. Families of more than three are not seen; and the species is never found in bands as the Vizcacha. The animal is very active, escaping with great rapidity under the the small bushes of aculeate leguminous plants which are common in that part of the country, and hiding in the thickest of the bushes, where it seems to have its burrows. This species avoids open grounds, like the Patagonian Cavy. Of the internal parts I know only the skull, which is entirely of the same form as that of Dolichotis patachonica, but much smaller, scarcely half the size. The skull has the same broad front, with the large superciliary margins and all the other peculiarities mentioned by Mr. Waterhouse (Nat. Hist, of M a m . vol. ii. p. 156). The teeth are the same; each of the four molars has two triangular lobes, except the smallest of the upper jaw ; the first of the under jaw fur- |