. 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. Birds; Birds. Fig. 553. —Pigeon Guillemot, nat. size. or sooty, little varied with white ; under parts white, marbled, rayed and waved with dusky; incipient mirror spotty. Nestlings
. 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. Birds; Birds. Fig. 553. —Pigeon Guillemot, nat. size. or sooty, little varied with white ; under parts white, marbled, rayed and waved with dusky; incipient mirror spotty. Nestlings are covered with sooty brownish-black down; bill and feet brownish-black. Perfectly white and entirely black birds are rarely seen, The mirror on the upper surface of the wings is composed of the terminal half (more or less) of the greater coverts, the rest dark ; of the several next rows excepting their dark bases, the white of these coverts normally overlying and concealing the dark basal portions of the greater coverts, so that the oval mirror is usually unbroken; the anterior border, of the mirror is the line through the union of white tips with dark bases of the row of lesser coverts about i an inch from the fore-arm edge of the wing. When, as not seldom happens, the row of greatest coverts are dark beyond the extent of the next row, this dark being thus uncovered, shows as a wedge partly splitting the mirror, as normally occurs in U. columha. Or, the greater row of coverts may be entirely dark, when the mirror is unbroken, as before, but much smaller; or, again, the middle row of coverts may be tipped with dark, making a break across the mirror, but in a different method fi-om that first described. Finally, the mirror may be only in- dicated by isolated white feathers, or whoUy want- ing. Length, average, ; extent, average, ; vring ; tail about ; tarsus ; middle toe and claw ; bUl ; gape ; gonys ; depth of bill at base ,
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbirds, bookyear1894
