It seems perfectly conscious of the unusual adornment of its head, treasuring its bushy beard with as much care and pride as does a human exquisite. When drinking, it dips its paw, curved into the shape of a spoon, into the water, and thus brings the liquid to its mouth. The natives declare that it does so to avoid the risk of wetting its long beard, of which--being generally destitute of such appendages themselves--they fancy it must be excessively vain. As it is chiefly nocturnal in its habits, it might be classed among the Nyctipitheci, or night monkeys. From its fierce countenance, long, sharp teeth, and savage temper, it has gained its second scientific name--Brachyuras Satanus. THE CACAJAO. The cacajao is a curious contrast to the cuxio. It is called also the black-headed saki. Unlike most of its brethren, it has but a short, hairy tail, looking as if it had been docked. The head is perfectly black, somewhat flattened at the temples, with large ears approaching in shape to those of the human head, and devoid of hair. The fur on the body is generally of a bright yellowish-brown. When full-grown, the animal reaches to upwards of twenty inches in length, while the tail is from three to five inches long. Its legs are covered with rough hair, and its fingers are unusually long and slender, giving it an awkward appearance when feeding. In captivity it is a docile and peculiarly timid animal. A little creature which had been caught exhibited great alarm at the appearance of several small monkeys of its own country; and when a serpent was placed before its eyes, it trembled violently. It is found on the borders of the Negro, where it is known by several names--among others, as the mono faio, or ugly monkey. MARMOSETS, OR MIDAS MONKEYS. The most active, playful, and amusing of animals are the midas monkeys, which form the second family of American Quadrumana, several species of which exist, each in its respective district. As they are seen gambolling among the branches,--now running round and round the trunk of a perpendicular tree, now with their sharp claws rapidly mounting the branches, sending down showers of rotten bark and twigs, and uttering sharp twittering cries,--they might be mistaken for a troop of squirrels. They are restless, inquisitive little creatures, possessed of a large share of curiosity. When a stranger is passing through the forest, they invariably stop for a few moments to have a stare at him.