in ornithology, a genus belonging to the order of picce. The beak is convex, cultrated, very large, and serrated outwards; the fore-head is naked, with a bony gibosity. The nostrils are behind the base of the beak. The tongue is sharp and short. The feet are of the greffarii kind, i.e. the toes are distinct from each other. There are four species of the buceros, viz. 1. The bicornis, with a flat bony fore-head, and two horns before. The body is black, and about the size of a hen; but the breast, belly and thighs are white. There is a white spot on the wing; the tail is long, with ten black prime feathers, and the four outermost on each are white. The feet are greenish, with three toes before and one behind. It is a native of China, and called Calao by Willoughby and other authors. 2. The hydrocorax, or Indian crow of Ray, has a plain bony fore-head without any horns. The body is yellowish, and blackish below. It inhabits the Molucca islands. 3. The rhinoceros, has a crooked horn in the fore-head joined to the upper mandible. It is a native of India, and feeds upon carrion. 4. The natatus, has a smooth fore-head. It is about the size of a magpie, and is a native of Senegal.