. On the natural history and classification of birds . large, nearly cover-ing one half of the bill. Loresclothed with small feathers, andlengthened recurved bristles. Gapep 2. 212 ON THE CLASSIFICATION OF BIRDS. very wide. Ears large, surrounded by a ruff of smallthick-set feathers. Tarsi very long, slender, smooth. (fig-189.) C. pygargus. Selby, pi. 10. E. rutilans. PI. Col. 25. Vieil. G. 13. E. Subfam. FALCONING. Falcons. Bill short, suddenly curved from the base. The upper mandible armed near the tip with a sharp angulated tooth, often double, beyond which is a slight festoon;

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. On the natural history and classification of birds . large, nearly cover-ing one half of the bill. Loresclothed with small feathers, andlengthened recurved bristles. Gapep 2. 212 ON THE CLASSIFICATION OF BIRDS. very wide. Ears large, surrounded by a ruff of smallthick-set feathers. Tarsi very long, slender, smooth. (fig-189.) C. pygargus. Selby, pi. 10. E. rutilans. PI. Col. 25. Vieil. G. 13. E. Subfam. FALCONING. Falcons. Bill short, suddenly curved from the base. The upper mandible armed near the tip with a sharp angulated tooth, often double, beyond which is a slight festoon; under mandible deeply toothed at the end. Nostrils circular; cere short. Feet moderate; tarsi slender, naked; middle toe very long, lateral either equal or unequal, hinder very short. Wings lengthened, pointed; the second quill longest, and, with the first, deeply notched internally, near their tips. Tail rounded. Falco, Auct. True Falcons. Both mandibles of the bill with a single acute tooth near the tip. Nostrils round, naked. Wings moderate or long, pointed; the first quill rather shorter than the second, which, with the third, are the longest. Tarsi slender, naked,

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Keywords: ., bookcentury1800, bookid, booksubjectbirds, booksubjectornithology