. 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 . n. 8parrow Hawk. Crown ashy-blue, with a chest-nut patch, sometimes small or altogether wanting, sometimes occupyingnearly all the crown; conspicuous black maxillary and auricular patches,which with three others around the naj^e make seven black jDlaces in all, buta part of them often obscure or wanting; back cinnamon brown, in the $with a few black spots or none, in the 9 with numerous black bars ; wingcove
. 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 . n. 8parrow Hawk. Crown ashy-blue, with a chest-nut patch, sometimes small or altogether wanting, sometimes occupyingnearly all the crown; conspicuous black maxillary and auricular patches,which with three others around the naj^e make seven black jDlaces in all, buta part of them often obscure or wanting; back cinnamon brown, in the $with a few black spots or none, in the 9 with numerous black bars ; wingcoverts in the $ ashy-blue, with or without black spots, in the 9 like theback; quills in both sexes blackish with numerous pale or wiiite bars oninner webs; tail chestnut, in the $ with one broad black sul^terminal bar,white tip, and outer feather mostly white with several black bars ; in the 9the whole tail with numerous imperfect black bars; below white, variouslytinged with butf, or tawny, in the $ with a few small black spots or none,in the 9 with many brown streaks ; throat and vent nearly white and immac-ulate in both sexes; bill dark horu, cere and feet yellow to bright orange;. FALCONID^, DIUENAL BIRDS OF PREY. GEN. 159. 215 10-11; wing 7; tail 5, more or less. North America, everywhere, veryabundant. This elegant little hawk will be immediately recognized by itssmall size, and entirely peculiar coloration, although the plumage variesalmost interminabl3\ However the case may be with the West Indian andother exotic forms, no races have been discoveredin this country sufEciently marked to requiredesignation by name. But we may, perhaps,with Mr. Eidgway (Proc. Phiia. Acad. 1870,149), recognize var. isabeUinus, as a JliddleAmerican coast form occurring in the Gulf States,although of course it shades directly into the ,;^ ordinary plumage (no rufous on crown ; severallateral tail feathers variegated, the black zone an ^•^- ■p-^ ^^k-inch wide ; black spots on back and si
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