CHARACTERS.--Entirely black; fur silky, and longer on the head and tail than on the body; fur on top of head directed from behind forwards, falling over the forehead, meeting the backwardly directed hairs of the forehead and forming a tuft. Face black, the upper part naked; chin with stiff black hairs mixed with a few white ones. Ears oval and human-like in form, the upper part movable at will. Thumbs entirely wanting. Length of body, 19 inches; tail, 26 inches. Distinguished from _A. paniscus_, which it closely resembles, by the black colour of its face, and the direction of the hairs on the forehead. YOUNG.--Lighter in colour than the adults; sometimes brown on the back and the outer side of the limbs. DISTRIBUTION.--The Black-Faced Spider-Monkey ranges from Panama, through the United States of Colombia to Eastern Peru. HABITS.--Entirely arboreal, living in large troops, and feeding on fruits. {242}VII. THE GRIZZLED SPIDER-MONKEY. ATELES GRISESCENS _Ateles grisescens_, Scl. MSS.; Gray, P. Z. S., 1865, p. 732; id. Cat. Monkeys Brit. Mus., p. 42 (1870); Scl., P. Z. S., 1871, p. 223; Schl., Mus. Pays Bas, vii., p. 168 (1876). CHARACTERS.--Hair of forehead elongate. Fur in general moderately long, black, with greyish-white hairs intermingled, giving it a grizzled appearance; under side of tail grey. Similar to _A. ater_ and _A. paniscus_, but distinguished by the intermixture of grey hairs, and by the colour of the under side of the tail. Thumbs absent. YOUNG MALE.--Rather lighter in colour, especially on the under side of body; tail black above, grey beneath. Length of body, 14 inches; tail, 16 inches. DISTRIBUTION.--The habitat of this species is not certainly known. Dr. Sclater considers it probable that it will turn up in some part of the Central American or the Colombian coast. VIII. THE BROWN-HEADED SPIDER-MONKEY. ATELES FUSCICEPS. _Ateles fusciceps_, Fraser MSS.; Gray, P. Z. S., 1865, p. 733; Sclater, P. Z. S., 1872, p. 663, pl. lv.; Gray, Cat. Monkeys Brit. Mus., p. 42 (1870); Schl., Mus. Pays Bas, vii., p. 173 (1876). CHARACTERS.--Fur thick. Hairs long, shining, crisp, deep black above, the hairs of the back with brownish tips; the under side of the body and inside of the limbs black; crown of head deep coffee-brown. Length of body about 20 inches; of the tail, 26 inches, according to the dimensions taken from the skin of a young animal by Dr. Sclater. Thumbs entirely wanting. {243}DISTRIBUTION.--In 1860, when Mr. L. Fraser returned from Ecuador, he spoke of a large Monkey he had seen, but had not obtained, in the valleys of Western Ecuador. It remained unknown until it was shot, and brought to England by Mr. Buckley some ten years later. It was the only Monkey, he says, except a _Mycetes_, which he saw in Trans-Andean Ecuador. HABITS.--These, doubtless, do not differ from those of other Spider-Monkeys. IX. THE HOODED SPIDER-MONKEY. ATELES CUCULLATUS.