_Ateles vellerosus_ (_?_) (nec Gray), Scl., P. Z. S., 1871, p. 478.
_Ateles rufiventris_, Scl., P. Z. S., 1872, p. 688, pl. lvii.; Schlegel,
Mus. Pays Bas, vii., p. 182 (1876).
CHARACTERS.--Fur rough, upstanding less on the tail than on {237}the body,
that on the forehead erect and directed backwards, that on the top of the
head long, projecting forward. Face and muzzle, except a black line from
the side of the nose and inner corners of the eyes to the cheeks,
flesh-coloured. General colour uniform black, but the whole under surface
deep bright rufous, this colour extending but slightly on to the inner
surface of the limbs. Thumbs entirely wanting.
Differs from _A. geoffroyi_ by its flesh-coloured face and by the two
colours of the upper and under sides being clearly defined. Length of body,
12 inches; of tail, 15½ inches.
DISTRIBUTION.--This species was first discovered on the Atrato river, in
Northern Colombia, and has since been found in Panama.
HABITS.--The Red-bellied Spider-Monkey is very rare, only one or two
specimens having yet been obtained. Nothing is, therefore, known of its
habits.