Hylobates concolor (Harlan, 1826) . J. Acad. Nat. Sci. Philadelphia, ser. 5, 4:231.

TYPE LOCALITY: Vietnam, Tonkin .

DISTRIBUTION: Hainan Isl (China); E of the Mekong River in S Yunnan (China), Laos, and Vietnam to Red River in Vietnam.

STATUS: CITES - Appendix I; U.S. ESA - Endangered; IUCN - Vulnerable.

SYNONYMS: furvogaster, hainanus, harlani, jingdongensis, lu, nasutus, niger .

COMMENTS: Type species of subgenus Nomascus which was recognized as a separate genus by Lekagul and McNeely (1977:308); but see Corbet and Hill (1980:91) and Szalay and Delson (1979:461).