. The water birds of North America . alcate form, the inner web widenedinto an excessively broad, fan-like, or sail-like ornament. Tail short ; the rectrices shorterthan the lower coverts, much longer than the upper. (Aix, Boie.)A. sponsa. Feathering at the base of the maxilla extending much farther forward at the ric-tus than at the sides of the forehead, and forming a gently curved (convex) line betweenthese points ; depth of the bill at the base much greater than the width, the upper baseof the maxilla forming a deep angle extending a considerable distance on each side of theforehead; feath
. The water birds of North America . alcate form, the inner web widenedinto an excessively broad, fan-like, or sail-like ornament. Tail short ; the rectrices shorterthan the lower coverts, much longer than the upper. (Aix, Boie.)A. sponsa. Feathering at the base of the maxilla extending much farther forward at the ric-tus than at the sides of the forehead, and forming a gently curved (convex) line betweenthese points ; depth of the bill at the base much greater than the width, the upper baseof the maxilla forming a deep angle extending a considerable distance on each side of theforehead; feathers of the side of the head and neck short and velvety, inner tertial ofnormal form, the shaft straight. Tail long (half as long as the wing), vaulted, graduated,the leathers very broad, and extending tar beyond the coverts. (I), ndronessa, Swainson.) The nearest ally of Aix, so far as structure isrepresented by the well-known Muscovy Duck (C. concerned, in America, is the genus Cairina,moschata) ; but this differs in many important. ,1. sponsa. particulars, chief among which are the very large Mature and marked discrepancy in size betweenthe sexes, and the brownish fleshy caruncles on the forehead and lores. The points of similarityare numerous, however, the tail being long, broad, graduated, and somewhat vaulted, the nailof the hill very luge and broad, the nostrils huge and open, the head crested, etc. Among thepeculiarities of Cairina, as distinguished from other American genera, are the naked and caruncledtare, the extremely lengthened secondaries, and relatively .-holt greater wing-coverts. — THE DUCKS — A1X. 11
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbirds, bookyear1884
