20 
their long, dog-like noses, in some cases projecting beyond 
, the lips. 
Although these Monkeys are coarse and brutal in their 
behavior towards man, they are capable of a high degree 
of attachment among themselves. 
A remarkable instance of this is given by Brehm, an African 
traveler of undoubted veracity, who once saw a troop of Ba- 
boons crossing a valley, — while so doing they were attacked 
by his dogs, and fled up the hills, leaving behind one young 
one, which, unable to run away, had climbed a rock in the 
middle of the valley. Those on the hillside deliberated for 
a time, and finally a large male returned to the spot, drove 
off the dogs, picked up the young one, and retreated with it 
in safety. 
The American Monkeys differ in many respects from the 
preceding group; in dentition, which in tht Cebidce, includ- 
ing all but the Marmosets, has one pre-molar tooth added on 
each side of the jaw ; in the absence of a thumb in almost 
all the members of one large genus (^A teles); in the entire 
absence of the callosities on the haunches, which are so con- 
spicuous in most of the Catarrhini ; and in the presence of 
a highly prehensile tail in the individuals 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 belzebuth), 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 
amusement by his antics ; he seems never disposed to take 
advantage of his freedom to run away, and manifests a most 
devoted attachment to his keeper. 
