P leucocephala

Saki Sa"ki (s[=a]"k[i^]), n. [Cf. F. & Pg. saki; probably from the native name.] (Zo["o]l.) Any one of several species of South American monkeys of the genus {Pithecia}. They have large ears, and a long hairy tail which is not prehensile. [1913 Webster]

Note: The black saki ({Pithecia satanas}), the white-headed ({P. leucocephala}), and the red-backed, or hand-drinking, saki ({P. chiropotes}), are among the best-known. [1913 Webster]