. The birds of Illinois and Wisconsin. Birds; Birds. Jan., 1909. Birds of Illinois and Wisconsin — Cory. 649. Adult female: Similar, but upper parts slightly deeper olive yellow than the male; under parts, pale yellow, rufous streaks faint or entirely wanting. Diagnostic character in any plumage: Tail feathers, fuscous brown, with inner webs largely clear yellow. Length, ; wing, ; tail, 2; bill, .38. The Yellow Warbler is a very common summer resident in Illinois and Wisconsin; noticeable on account of its yellow plumage. The majority arrive from the south the latter part of April or e
. The birds of Illinois and Wisconsin. Birds; Birds. Jan., 1909. Birds of Illinois and Wisconsin — Cory. 649. Adult female: Similar, but upper parts slightly deeper olive yellow than the male; under parts, pale yellow, rufous streaks faint or entirely wanting. Diagnostic character in any plumage: Tail feathers, fuscous brown, with inner webs largely clear yellow. Length, ; wing, ; tail, 2; bill, .38. The Yellow Warbler is a very common summer resident in Illinois and Wisconsin; noticeable on account of its yellow plumage. The majority arrive from the south the latter part of April or early in May, and leave early in September. Aside from its familiar chirp it has a pleasing song, which may be crudely described as we-chee, we-chee, we-chee-u. Breeds in May and June; the nest is cup shaped, usually in bushes or low trees, and composed of plant fiber and grass, lined with plant down and feathers. The eggs are from 3 to 6, bluish or greenish white, spotted with light and very dark brown and gray chiefly at the larger end, and measure about .68 x .49 inches. The Field Museum collection contains a series of sets of eggs of this species taken in northern Illinois between June 8th and 18th. 312. Dendroica cserulescens (Gmel.). Black-throated Blue Warbler. Eastern North America, west to the Rocky Mountains and north to Labrador, northern Ontario, and Quebec; breeds from northern New England and northern New York northward and in the Alleghany Mountains south to Georgia; winters in the West Indies, Central America, and northern South America. Adult male: Upper plumage, slaty blue (occasionally in full breeding plumage showing more or less black on the back); sides of the head from above the eyes, throat and sides of body, black, the sides more or less mixed with white; rest of under parts, pure white; basal portion of most of quills, white, extending beyond the coverts and form- ing a white wing spot; wing coverts, black, edged with slaty blue; tail, blackis
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