The Yellow-throated Warbler (Dendroica dominica dominica) is a long-billed species which looks a good deal like a Black and White Warbler with a yellow throat; it occurs in the southernmost counties. It may be found as a nesting bird.
WORM-EATING WARBLER
Helmitheros vermivorus (Gmelin)
Description.—Crown and superciliary buffy brown; prominent black streak at either side of crown; black streak through the eye; underparts buffy, the centers of the under tail-coverts darker; upperparts olive-green, much as in a vireo. Female and young: Similar but duller. Length: 5½ inches.
Range in Pennsylvania.—In southern and particularly southwestern Pennsylvania this species is a fairly common summer resident from early May to mid-September. It is found chiefly in deciduous woodlands along streams. It is rare in central and northern counties.
Nest.—A neatly built cup of rootlets, hair, and vegetable fiber, placed on the ground, usually at the base of a sapling. Eggs: 4 or 5, white, finely speckled with reddish brown.
Worm-eating Warbler
The song of this comparatively little-known species is very much like that of a Chipping Sparrow. If you hear a Chipping Sparrow in the woods, you had better look for the bird; you may make a startling discovery, since Chipping Sparrows are rarely found away from human dwellings in Pennsylvania.
The Worm-eating Warbler is nearly always found near the ground, and it is usually necessary to keep quiet so as to let the bird approach if you wish to have a good look at it.
BLUE-WINGED WARBLER
Vermivora pinus (Linnæus)
Other Name.—Blue-winged Yellow Warbler.
Description.—Adult male: Front of head, breast, and belly bright, clear yellow; sharp black line through eye; back of head and back olive-green; wings and tail blue-gray, the wings with two noticeable white bands; the tail with white spots at tips of inner webs of outer feathers. Female: Much duller, the whole top of the head being greenish, as a rule. Length: 4¾ inches.
Range in Pennsylvania.—A decidedly local summer resident from early May until mid-September, to be found in all but the mountainous counties.
Nest.—A cup made of leaves, lined with fine grasses, placed at the base of a weed or a little bush, usually in a low meadow or at the edge of an alder swamp. Eggs: 3 to 5, white, spotted with reddish brown, chiefly at the larger end.
