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.
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.