squirrel monkey

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of several small arboreal monkeys of the genus Saimiri of Central and South American tropical forests, having a white face with a black nose and mouth, short fur, and a long nonprehensile tail.

from The Century Dictionary.

• noun One of many kinds of small South American monkeys with a long, bushy, and nonprehensile tail: so called from their general aspect.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun any of several small New World monkeys, of the genus Saimiri, that live in Central and South America

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun small long-tailed monkey of Central American and South America with greenish fur and black muzzle