110 
VERTEBRATA. 
turnal in their habits. They generally live by couples or in small families. The males share with 
the females the care of rearing the young ; but when these have arrived at years of discretion, 
the fathers drive them away. The genus is divided into two branches — the Brachyures^ which 
have very short tails, and the SaMs projye^-^ with long, large tails. 
The Red Saki, Brachyurus rubicundics, is about fifteen inches long, the tail having the appear- 
ance of a large hairy ball. The fur is reddish, the face vermilion, and the top of the head nearly 
bald. It is found in the valleys of the Upper Amazon. 
The Bald Saki, Brachyurus calvus, resembles the preceding, and is found in Brazil and Peru. 
The B. ouakary and the B. cacajo, or Fithecia melanocephala of E. Geolfroy, are found on the bor- 
ders of the Orinoco. 
The White-headed Saki, Pithecia leucocejjJiala, is one of the long-tailed species. Its body 
measures fifteen inches, and its tail seventeen. It is found in Guiana, where it is called Yarkee. 
Some other species are called Yarkee by the natives. 
The Gold-headed Saki, Pithecia ochrocephala, the P. chrysocephala, P. monachics, P. mari- 
quoina, P. inusta, P. alhinasa P. satanas, P. hirsuta, P. cheiropotes, are the other species. 
THE Oli[STITI, OR MARMOSET. 
THE HAPALIDJ3. 
This family, as already stated, embraces the Ouistitis and the Tamarins. 
Genus OUISTITl. — Hapale : — These animals are called Squirrel Monkeys, because in size, 
sprightliness, and manner of running along upon the trees, they resemble squirrels. They are six 
or eight inches in length ; their fur is thick, and of various colors ; the tail long, covered with hair, 
and non-prehensile ; their nails are long and sharp, enabling them to run along upon the smallest 
and most flexible branches of the trees. They inhabit wooded districts, and live in small bands. 
Both male and female assist in rearing the young, though the mother occasionally eats off the 
head of one of her offspring. She usually carries the young on her back, but when she gets 
tired, does not hesitate to rub them off against a tree. These are less intelligent than other 
monkeys, and have neither the cunning, nor the strength, nor the love of liberty which mai;J^s the 
other species. Nevertheless, they are so small, soft, gentle, and graceful, as to be pets with many 
persons. Ladies of quality, a century ago, held them in great estimation. They are found in dif- 
ferent parts of tropical South America. 
The Ti-Ti, or Jacchus, Hafpale jacchus^ or Simia jacchus, described by Bufi"on, is generally of 
an ash color, and has long gray hairs standing out from the side of its head. The face is of a flesh 
