The Agouti appears to breed all the year round, usually producing two young ones at a birth. The female prepares her dwelling for the reception of her family by lining it comfortably with leaves, fine roots, and hair. In the southern parts of Brazil, in Paraguay and Bolivia, the place of this species is taken by AZARA’S AGOUTI (_Dasyprocta Azaræ_). A smaller species, the ACOUCHY (_D. acouchy_), is found not only in Guiana and the north of Brazil, but also in several of the West India Islands. The last-named species has a well-developed tail about two inches long. [Illustration: SKULL OF THE PACA.] Besides the Agoutis, this family includes an allied animal, the PACA (_Cœlogenys paca_), which differs generically from the Agoutis by having five toes on the hind feet. It has a broader head and a blunter muzzle, and is altogether a rather stouter animal than the Agoutis; but, like most of them, it has a mere tubercle instead of a tail. One of the most remarkable characters presented by this animal, however, is the enormous development of the zygomatic arches, which are enlarged and inflated in the most extraordinary manner, the maxillary portion, which occupies the anterior two-thirds being hollowed out beneath into a great chamber, lined with mucous membrane, and opening into the mouth by a rather small aperture. The function of these remarkable cavities is at present quite unknown. Food is not to be found in them, and, indeed, as they are enclosed by solid bone, it would seem impossible that they could act as cheek-pouches. [Illustration: PACA.] The Paca, which inhabits Central and South America from Guatemala to Paraguay, is about two feet long, and is clothed with short rather coarse hair of a brown or yellowish-brown colour above, white beneath, with from three to five bands of white streaks and spots upon each side of the body. In its habits the Paca very much resembles the Agouti. It usually lives singly, or sometimes in pairs, on the borders of the forests, or near the banks of rivers, taking up its abode during the day either in a hole at the root of some tree, or in a burrow excavated by its own labour, which is generally carried to a depth of four or five feet. Its food consists of the leaves, fruits, and flowers of various plants, and, like the Agouti, it occasionally does mischief in the corn-fields and gardens. The female produces only one, or at most two, young at a birth. The Paca swims well, and can cross even a broad river in this way. Its flesh, like that of the Agouti, is very well flavoured, and is consumed both by natives and Europeans. FAMILY XV.--DINOMYIDÆ.