. Key to North American birds. Containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary, inclusive of Greenland and Lower California, with which are incorporated General ornithology: an outline of the structure and classification of birds; and Field ornithology, a manual of collecting, preparing, and preserving birds . ral and posterior aspects are thickly reticulated, as in casjna, butthe plates are not so rough nor elevated. Tail long for this subgenus, quite deeply forked;central feathers broa
. Key to North American birds. Containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary, inclusive of Greenland and Lower California, with which are incorporated General ornithology: an outline of the structure and classification of birds; and Field ornithology, a manual of collecting, preparing, and preserving birds . ral and posterior aspects are thickly reticulated, as in casjna, butthe plates are not so rough nor elevated. Tail long for this subgenus, quite deeply forked;central feathers broad to their very tips, which are rounded ; lateral ones successively moreelongated and narrower toward their tips, the external pair slender and quite filamentous forsome distance. Adult iu summer : Pileum glossy greenish-black, not extending below eyes, sonarrow on side of upper mandible that a broad white streak extends to extreme tip of thefeathers. Mantle exceedingly light pearl-blue, fading imperceptibly into white on the rump andtoward the extremities of the tertials. Tail wliite, with a faint tinge of pearly, especially on thecentral feathers and inner webs of the others. Secondaries pure white for their whole length ex-cept a small space on the outer web near the tip, which is grayish-blue, deeper than the web of first primary grayish-black ; the inner web of the same has a space of black. Fig. 513. — Royal Tern, f nat. size. (From Sclater and Salvin. 760 SYSTE3IATIC SYNOPSIS. — LONGIPENNES — GA extending the whole length of the feather, t^^ naiTo\A at the base, widening as it runs towardthe tip, within 1-^ inches of which it occupies the wliole web; the rest of the web white, sep-arated from the black by a straight distinct line of division. The second, third, fourth, andfifth primaries have the same general characteristics, but the white space rapidly grows nar-rower and shorter, and runs up further in the centre than along the edge of the web,
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1896
