These monkeys are reported to range from 570 mm to 760 mm in head and body length. The tail is between 510 and 720 mm. Coat color is sexually dimorphic. Males and females have a golden belly, forehead and neck. Males have grayish black on the nape, shoulders, arms, back, head and tail. In females, these parts are brownish black.
The nose is flattened, with nostrils facing forward. Two flaps of skin on the widely opened nostrils form peaks that almost touch the forehead.
Range length: 570 to 760 mm.
Sexual Dimorphism: male larger