_Saimiris usta_, Is. Geoffr., Arch. Mus., iv., p. 15, pl. 1 (1844).
_Saimiris ustus_, Bartlett, P. Z. S., 1871, p. 219; Sclater, P. Z. S.,
1872, p. 688, fig. of head.
_Chrysothrix ustus_, Gray, Cat. Monkeys Brit. Mus., p. 53 (1870).
_Saimiri sciureus_ (nec L.), Schl., Mus. Pays Bas, vii., p. 242 (1876,
pt.)
CHARACTERS.--Face white; head grizzled grey, minutely punctulated with
black, the hairs grey with black tips; outer side of fore-arm grizzled
grey, but in some species golden; back {155}grizzled grey, washed with
golden, the tips of the hairs black; tail short, thick and grey, but with
the tip black.
DISTRIBUTION.--The forests of Bolivia and Brazil. This is a common species,
inhabiting the whole of the Peruvian Amazons, and may be met with on every
stream. (_E. Bartlett._)
HABITS.--Arboreal and gregarious, moving about in large numbers through the
forest, feeding on insects--chiefly orthoptera and spiders--small birds,
and fruits.