The sajous have neither pouches on the sides of their jaws, nor callosities on their posteriors. Their face and ears are of a flesh colour, with a little down on them. The partition of the nostrils is thick, and their apertures are placed pretty close to each other. Their tail is prehensile, naked underneath at the extremity, and very bushy over every other part. Some have black and brown hair, as well about the face as on all the upper parts of the body. Others are grey about the face, and of a light brown on the body. Their hands are always black and naked. They are but a foot long from the extremity of the muzzle to the insertion of the tail. They walk on all fours.[Y] [Footnote Y: In a description of M. Vosmaër, printed at Amsterdam in 1770, there is an account of a _singular species of the flying American ape_, &c. which, however, appears to be the same animal as our brown sajou.] THE SAI. Of the Sai (_fig. 215._) we have seen two which seem to make a variety in the species. The hair of the first was a deep brown, and that of the second, which we have called the _White-throated Sai_, has white hair on the breast, neck, and round the ears, and cheeks; and it differs also from the first, in its face being less hairy; but in other respects they perfectly resemble each other; being of the same disposition, size, and shape. Travellers have described these animals by the name of _weepers_, from their plaintive moan. Others have called them _musk monkeys_, because like the maucauco they have a musky odour. They have likewise been termed macaque, borrowed from the animals so called in Guinea; but the macaque is a monkey with a flaccid tail; while the animals we are speaking of belong to the sapajous, their tails being prehensile. The females have only two teats, and bring forth but one or two at a time. They are gentle, docile, and so timid, that their common cry, which resembles that of a rat, becomes a kind of groaning when they are threatened with danger. Their food in this climate is principally snails and beetles, which they prefer to any other; but in their native country of Brasil, they chiefly live upon grain and wild fruits which they pluck from the trees, from whence they seldom descend till they have stripped their habitation of its treasure. _Distinctive Characters of this Species._ The sai has neither pouches on the sides of his jaws, nor callosities on his posteriors. The partition of the nostrils is very thick, and the apertures are placed on the side, and not beneath the nose. The face is round and flat, and the ears almost naked. The tail is prehensile and naked towards the extremity. The hair on the upper part of the body is a deep brown, and on the lower parts, of a yellowish grey. These animals are not above fourteen inches long, and their tails are longer than the head and body together. They walk always on four feet. The females are not subject to the periodical emanation. THE SAIMIRI.