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Show 1866.] DR. J. E. GRAY ON AUSTRALIAN MAMMALS. 221 shoulders darker ; side of the head, near base of ears, and body pale reddish ; shoulders outside of fore and hind legs paler bay ; streak on cheek and upper part of thigh white. Hab. North Australia, Port Albany (Coxen). This species is very like H. agilis; but the tail and hind feet are much shorter. The fur is darker, and especially on the nape and upper part of the middle of the back. The sides of the body and face, and especially the head round the base of the ears, and the legs are bright rufous. The white mark on the thigh is as distinct as in H. agilis. The Halmaturi with a well-marked oblique white streak across the thigh may be thus divided:- * Tail and feet elongate; the front and hinder cutting-teeth large, the second one moderate. 1. HALMATURUS DORSALIS. The back with a narrow well-defined dorsal streak. The second or central cutting-tooth on each side small, smooth, The hind foot 8f inches long. 2. HALMATURUS AGILIS. The back on each side darker than the sides. The second or central cutting-tooth on each side with a central ridge. The hind foot 8f inches long. ** Tail and feet short, thick ; the front and hinder cutting-teeth moderate, the second one small. *\ 3. HALMATURUS COXENII. Back darker than the sides, The hind feet 5| inches long. I have named this fine species after Mr. Charles Coxen, the brother of the late Mrs. Gould, the discoverer of several very interesting animals in Australia. MUS MACROPUS. Yellow grey brown ; middle of the back blackish, from the black tips of the longer hairs; the mouth, throat, chest, belly, inside of the legs, and the upper surface of the feet white; whiskers very long, stiff, black; tail naked, with rings of square scales, yellow, basal third black. The feet nearly naked. The cutting-teeth flat, smooth, yellow in front. Ears nakedish, with short scattered hairs. Length of body and head 10£, tail \Q\ inches ; hind feet 2 inches 5 lines. There are three species of Mus in the Museum with the tails more or less varied with yellow, which differ in the size of the cutting- teeth and feet. The one from North Australia differs from the other two in having very much larger feet. |