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Show MAMMALIA. 17 duces a deep brown tint, which is almost uniform throughout the body and limbs. On the head the yellowish colour predominates over the blac.:k, excepting on the tip of the muzzle, and tilence back to the eye, where the hairs are of a brownish black colour. On the throat the hairs are brown. The underside of the tarsus is black, and on the outer side of the fore-foot there is a black mark which extends upwards on to the wrist. The tail is long and bu hy; towards and on the base, the hairs are annulated with black and yellow, like those of the body; but beyond this they are of a more uniform colom, each hair being brown at the base, and gmdually shaded into black towards the tip. The ears arc small and rounded, and covered with hairs of the same colour as those on the head. The claws are of a large size, and white colour; the toes are united for a consideraule portion of theit· length by the interdig·ital membrane. Length from nose to root of tail to base of car of tail (hairs inclllllcd) ln. Lines. 25 0 3 G 19 0 Habitat, Rio de Janeiro, Brazil. (lJiuy. ) Length of car H eight of body at shoulders ln. Lines 0 12 "This cat was given me by an old Portuguese priest, who had hunted it down in a thick forest with a small pack of dogs, after a severe chase. It was killed near the Gavin. mountain, at the distance of a few miles only from Rio de Janeiro, where it was considered uncommon.'' D. Although small, compared with the Puma, (Felis concolm·, Auct.), this cat, in its slender lengthened body, small head, long tail, and stout limbs, decidedly evinces an affinity to that species. According to the dimensions of the Yagouaroundi given by Azara, Desmarest, and Temminck, it appears that the tail is considerably shorter in proportion in the specimens examined by those naturalists, than in the present individual, and the difference was such, as to induce Mr. Martin to believe that the latter was a distinct species; he accordingly pl'Oposed for it the specific name of .Darwinii. At the time that Mr. Mnrtin described the spec.:imcn alluded to, I was also inclined to believe it was a distinct species. I mention this because I am afraid my opinion bad a slight share in influencing Mr. Martin's determination. I have since seen many specimens, and upon comparing their dimensions, I find that the proportionate length of the tail varies more tllan is usual in other species of cats, and that the difference in tlte length in this member is not combined with any othet· di tinguishing character. In colouring there is al o a consideraule variation, some specimens being almost black, and having the hait·s but obscurely annulated with white. in others the hairs are more distinctly annulated, and the head assumes a ~rayish hue: Others again, are brown, or black brown, v |