. 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 . ddle line of belly, tips of secondaries,edge of outer primary and lateral tail-feathers, and a flank-patch, white. Forehead and lineover eye pale; a velvety black space before eye.
. 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 . ddle line of belly, tips of secondaries,edge of outer primary and lateral tail-feathers, and a flank-patch, white. Forehead and lineover eye pale; a velvety black space before eye. BUI black; feet drying yellowish. Thepurity of the color varies with the wear of the feathers, some specimens being dull sootybrownish, others more purely and even glossy blackish. The extent of the white along thebelly is very variable. The flank-patches arc conspicuous, in life sometimes almost meetingover the rump. Length ; extent about : wing the same as total length; tailabout , forked, soft. Southwestern U. S. and southward, breeding in colonies on cliflfs ; alarge and beautiful swift — a high-flier of almost incredible velocity, with a loud shrill twitter,nesting in the most inaccessible places, sometimes by thousands. The eggs do not appear tohave been taken yet, but are presumed to be white, as in all the species the eggs of which areknown. Pound N. to Wyoming, Utah, and CYPSELIB^^CH^TUBm^.: SPINE-TAIL SWIFTS. 457 32. Subfamily CH^TURIN/E: Spine-tail Swifts. Toes with the normal number of phalanges; all butthe penultimate ones extremely short. Anterior toes oleftto the base (no webbing). Hind toe not reversed, butsometimes versatile; our species have it obviously ele-vated. Tarsi never feathered ; naked and skinny, evenon the tibio-tarsal joint. In the principal genus, Chce-twra, containing about half the species of the subfamily,of various parts of the world, the tail-feathers are stiffenedand muaronate by the projecting rhachis. The othe
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1896
