. 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 . y U. S. ; common. Bonap.,Am. Orn. i, 1, pi. 1, f. 1 ; Aud., i, 98, pi. 24; Cass, in Bd., 16; Coop.,464. Iaico cooperi and F. stanJeii Nutt., i, 90, 91. A. mexicanus Bd., 17; Coop., 465, is the same bird coopeeii. 157. Genus ASTUR Adult dHk bluish-slate blackening on the head, with a whitesuperciliary stripe; tail with four broad dark bars ; below, closely barredwith white and pale s
. 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 . y U. S. ; common. Bonap.,Am. Orn. i, 1, pi. 1, f. 1 ; Aud., i, 98, pi. 24; Cass, in Bd., 16; Coop.,464. Iaico cooperi and F. stanJeii Nutt., i, 90, 91. A. mexicanus Bd., 17; Coop., 465, is the same bird coopeeii. 157. Genus ASTUR Adult dHk bluish-slate blackening on the head, with a whitesuperciliary stripe; tail with four broad dark bars ; below, closely barredwith white and pale slate, and sharply streaked with blackish. Young darkbrown above, the feathers with pale edges, streaked with tawuy-browu onthe head and ; below fulvous-white with oblong brown 2 feet long; wing 14 inches; tail 11; ^ smaller. A large, powerful,and, in perfect plumage, a very handsome hawk, inhabiting northern NorthAmerica; the northern half of the United States chiefly in winter, but alsobreeding in mountainous parts. Wils., vi, 80, pi. 52, f. 3; Nutt., i, 85;Aud., i, 95, pi. 23; Cass, in Bd., 15; Coop., 467. A variety of theEuropean Asturpalumbarius? FALCONIDJE, DIUENAL BIRDS OF PEEY. GEN. 158. 213 158. Genus FALCO Linnaeus. * Tarsus more or less feathered above, elsewhere irregularly reticulate in smallpattern ; 2d quill longest; 1st alone decidedly emarginate on inner web. Jerfahon, or Gyrfalcon. Tarsus feathered fully half-way down iu front,with only a narrow bare stiip behind, and longer than niiddle toe ; 1st quillshorter thau 3d. Upward of 2 feet long; wing al)out IG inches; tail , with darlv markings much as in the snowy owl; or, ash-colored withnumerous lighter bars; young striped longitudinally beneath. An arcticfalcon, of circumpolar distribution, in this country reaching the northernstates in winter. It is split into several varieties which, however, d(j notseem to be strictly geographical, and concerning which ornithologists
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