What is "nasalis larvatus"

Kahau \Ka*hau"\, n. [Native name, from its cry.] (Zo["o]l.) A long-nosed monkey ( Nasalis larvatus, formerly Semnopithecus nasalis), native of Borneo. The general color of the body is bright chestnut, with the under parts, shoulders, and sides of the head, golden yellow, and the top of the head and upper part of the back brown. Called also proboscis monkey. It is now an endangered species. [Written also kaha.]