21 
each side of the jaw; in the absence of a thumb in almost 
all the members of one large genus (Ateles); in the entire 
absence of the cheek-pouches and the callosities on the 
haunches, which are so conspicuous in most of the Catarrhini; 
and in the presence of a highly prehensile tail in the individ¬ 
uals of all the leading genera. None of them attain the size 
of the largest of the first group, and they are generally more 
tractable in disposition. 
The Ateles or Spider Monkeys are characterized by the 
absence of a thumb, although in several species it is present 
in a rudimentary condition; they have a prehensile tail, 
lined on the tip with a very sensitive skin, which answers the 
purpose of a hand in suspending themselves from the branches 
of the trees among which they altogether live. They are 
very delicate, and do not long withstand the severities of our 
climate. 
The Black Spider Monkey ( Ateles ater), the Marimonda 
(Ateles belzebutli ), and the BLAck-HANDED Spider Monkey 
(Ateles melanochir ), are usually to be seen here. A fine speci¬ 
men of the latter from Central America, “Jerry,” passes much 
of his time during the summer at large among the trees in the 
neighborhood of the Monkey House, and creates much amuse¬ 
ment by his antics; he seems never disposed to take advantage 
of his freedom to run away, and manifests a most devoted at¬ 
tachment to his keeper. 
The Brown Capucin ( Cebus fatuellus ), the Weeper Ca- 
pucin ( Cebus capucinus ), and the White-throated Capucin 
( Cebus hypoleucus ), are all small monkeys of the kind usually 
trained for circus performances and organ-grinders. These, 
with the Squirrel Monkey (Saimaris sciurea), all belong to 
the family Cebidce. 
The Common Marmoset (. Hapale jacchus ), the Black¬ 
eared Marmoset (. Hapale pencil lata), and the Pinche (Mi¬ 
das cedipus), are small and beautiful monkeys from the hottest 
parts of tropical America. 
A curious genus of small -monkeys of nocturnal habits is 
found in the interior of South America. They are very gen¬ 
tle and timid in disposition, and pass most of the day in sleep. 
The three-banded Douroucouli (Ny c tipi the cus trivirgaius) is 
the most common of these monkeys. 
