_Callithrix_, Geoffr., Ann. Mus., xix., p. 112 (1812).
This genus is intermediate between the Squirrel-Monkeys and the typical
Night-Monkeys. In the Titis, sometimes known by the name also of
Whaiapu-Sai Monkeys, the fur is soft, the head small, depressed, and not
produced backward as in _Chrysothrix_; the tail is long and bushy; the eyes
are small, and the orbits intermediate in size between those of the last
and the next genus; the nasal partition is broad, and the ears large. The
canine teeth are small, and the angle of the lower jaw expanded, somewhat
as in the Howlers (_Mycetes_), though to a less extent.
{159}The Titi Monkeys are diurnal animals, arboreal and gregarious, very
lively in disposition, noisy and agile, living on fruit, insects, birds'
eggs, and even small birds. They range all over South America, from Panama
to the southern limits of the forest regions.