_Parabuteo unicinctus_, ranging from the southern United States to Chili and Argentina, a sluggish carrion eater, is sooty-brown with rufous on the wing-coverts and thighs, and a white base and tip to the tail. _Buteola brachyura_ and _B. leucorrhoa_ of tropical America, separated from _Buteo_ by a central tubercle in the nostril, are black above; the former being white below and having four dark bars on the ashy tail, the latter only shewing white at the base of the black rectrices, which are crossed by one grey bar. _Asturina_, placed near _Astur_ by some authors, includes two species with Buzzard-like habits, that build slight nests and lay greenish-white eggs. _A. plagiata_, found from the South-West United States to Panama, is grey, barred with black on the primaries and with white below, while a white median band {167}crosses the rectrices, of which the coverts are black and white. _A. nitida_, reaching from Panama to south-east Brazil, differs in having white bars above. _Rupornis magnirostris_ of Colombia, Guiana, and Amazonia–hardly separable from _Asturina_–has three black belts on the tail and is rufous instead of grey beneath; _R. ruficauda_ of Central America, _R. pucherani_ of Brazil, Paraguay, and Argentina, and its Bolivian race _R. saturata_, have the chestnut remiges and rufous rectrices crossed with blackish, and the under surface as in the first-named, but the second is browner and shows a creamy patch on the primaries; _R. nattereri_, of Peru and Brazil, combines the chestnut primaries with an ashy and black tail; _R. ridgwayi_, of Haiti, is chiefly rufous and brown above, and slate-coloured with white bands below. _R. pucherani_ is very noisy and eats fish. _Butastur teesa_ (with its sub-species _indicus_) ranges from Japan and China to New Guinea and India; it is reddish-brown, varied with white on the nape and rump, the tail and lower parts being rufous, with black and white bars respectively. _B. liventer_, found from Burma to Celebes, is ashy below; _B. rufipennis_ of North-East Africa, has streaks in place of bars. The pugnacious Indian form has a mewing cry, feeds upon small mammals, lizards, frogs, and crabs, and builds its nest almost entirely of twigs, laying some three bluish-white eggs. _Geranoaëtus melanoleucus_ of western and southern South America, the so-called Chilian "Sea-Eagle," is black with grey wings and white belly, both barred with dusky; the flight is vulturine with spiral gyrations, the note is piercing; the food consists of carrion from the beach, small mammals, birds, and grasshoppers. The nest, placed in a tree or crag, is composed of sticks and grass, the two white eggs being blotched with pale red. It is often seen inland.