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Elanus leucurus.
The species of this well-marked genus are confined to the tropical and subtropical portions of the world, and appear to be only two in number, of which one is cosmopolitan, and the other peculiar to the Old World.
Species and Races.
Common Characters. Above pearly ash, becoming white or whitish on the head and tail, with a large black patch covering the lesser-covert region. Lower surface continuous pure white; a black spot on front of, and partly around, the eye.
1. E. leucurus. A large black patch on the lining of the wing, in the region of the primary coverts. First quill very much shorter than the third; second quill longest.
Black patch on lining of the wing restricted to the primary coverts; lesser coverts, on outer surface, not conspicuously bordered anteriorly with white.