Head and upper neck naked. Band of feathers from ear-coverts round nape. Plumage long and hackled. Tail of sixteen feathers, mid-pair lengthened. Sixth primary slightly the longest. Tarsus in male with four or five knobs. One species.
A. vulturinum. 30". The Vulturine Guinea Fowl. Nape-band velvety red-brown. Long hackles of neck, mantle, chest white, edged black and margined blue. Breast and belly blue. Naked skin blue. E. Africa. (O. G. ii. 84-102.)