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Show 104 DR. ST. G. MIVART O N [Mar. 18, I think it well to note these characters as indicating, with respect the tail, what is possibly another local variety of C. azarce, but I submit that the characters are by no means sufficient to justify its acceptation as a distinct species on the evidence of a single skin unaccompanied by its skull. I am the more inclined to regard it as a mere variety because the skin of C. azarce brought by Fitzroy from Patagonia (No. 227 A ) shows two imperfect annulations towards the root of the tail. (5) Canis entrerianus is a species instituted by Burmeister (' Reise durch La Plata,' 1861, p. 400) for a Canine form found by him between the rivers Parana and Uruguay. He obtained specimens exemplifying very different ages of both sexes. He describes it as reddish-yellow brown, the hairs of the back having black terminations and being whiter further down ; face and limbs red-brown like the back ; front of the neck, breast, and inner side of the limbs whitish or pale yellowish red ; end of the tail black. The young (which he found sucking in January) were of a yellowish brown, except the face, limbs, and tail-end, which were blackish brown. The mother, which was in milk on the 27th October, was reddish brown but dappled by the intermixture of white and black bristly hairs. The front of the neck, breast, and inner side of the limbs were reddish yellow. A n old male was a much lighter and clearer yellow colour, without any dappling on the back, being of a homogeneous tint, the bristly hairs having less black and no white. Underparts white. The male was taken on 27th February, so that he had probably a summer dress on, while the female was in winter clothing, which was longer and thicker than the male's. She had six mammae. The skulls of the male and female differed considerably, that of the female being more contracted behind the orbits. The length of the fourth upper premolar was in the male 15 aud the two molars 20 ; in the female P-4 was 14 and M. 1 + M.2 15 ; the mean of the two being as 100 to 120. The difference between the male and the female is so remarkable that it would almost justify a little scepticism as to the numbers given. The external characters I have quoted-characters which differ so much according to sex or season-do not seem to m e enough to distinguish and establish a species, although they are very interesting as pointing out another local variety-that of Entre Rios-of the very widely diffused C. azarce. (6) Canis gracilis.-This is again a species proposed by Burmeister ('Reise durch La Plata,' 1861, p. 406, and 'Description phys. Rep. Argentine,' vol. iii. p. 150) for a Dog inhabiting the bushy pampas of the environs of Mendoza. There he often saw it alive, and many skins brought to market. Amongst these was one with the dorsum and end of the tail rusty red. He describes the species, however, as an uncommonly slender form, more elegant than his C. griseus. The ground-colour is pale yellowish grey on the back- |