_Jacchus pygmæus_, Spix, Sim. et Vespert. Bras., pl. xxiv., fig. 2
(1823).
_Hapale pygmæa_, Wagner in Schreber, Säugeth., v., p. 126 (1855).
Castelnau, Voy. Amér. Sud, pl. 5, figs. 1, 2; Schl., Mus. Pays Bas, vii.,
p. 277 (1876).
{136}_Cibuella pygmæa_, Gray, Cat. Monkeys Brit. Mus., p. 64 (1870).
CHARACTERS.--Face with long brown whiskers, naturally brushed back over the
ears; ears small, with a few scattered hairs over them, but no ear-tufts,
sunk in the long fur of the head. General colour brownish-tawny; tail
ringed with black. The young resemble the adults from their earliest days.
This is the most diminutive Monkey known, and measures only six inches in
length.
DISTRIBUTION.--Forests of Brazil, extending north into Mexico. Mr. Bates
remarks in reference to this species: "I was surprised on my return to
England to learn that the Pigmy Marmoset was found also in Mexico, no other
Amazonian Monkey being known to wander far from the great river plain. Thus
the smallest, and apparently the feeblest, species of the whole order is
one which has by some means become the most widely dispersed."
HABITS.--Little or nothing is known of the habits of this individual
species, but there is very little doubt that they agree closely with those
of the Common Marmoset.