Range. - Eastern United States, breeding from southern New England and the northern states north to Hudson Bay; winters in the Gulf States and southward.

A beautiful Vireo with a slaty blue crown and nape, greenish back, white wing bars and underparts, the flanks being washed with greenish yellow; a conspicuous mark is the white eye ring and loral spot. They build firm, pensile, basket-like nests of strips of birch and grapevine bark, lined with fine grasses and hair, suspended from forks, usually at low elevation and often in pine or fir trees (of some twenty nests that I have found in New England all have been in low branches of conifers). Their three or four white eggs are specked with reddish brown. Size .80 x .60.

Blue-headed Vireo.

Creamy white.

White.

629a. Cassin's Vireo. Lanivireo Solitarius Cassini

Range. - United States west of the Rockies; north to British Columbia.

Similar to the last but with the back grayish.

629b. Plumbeous Vireo. Lanivireo Soli-Range. - Rocky Mountain Region, Breeding From Mexico To Dakota And Wyoming

Like the Blue-headed Vireo but with the yellowish wholly replaced by leaden gray.

PERCHING BIRDS.

629c. Mountain Vireo. Lanivireo Soli-Tarius Alticola

Range. - Mountains of Carolina and Georgia; winters in Florida.

Said to be larger and darker than solitarius proper. From all accounts, the habits, nests or eggs of this species differ in no wise from many of those of the northern Solitary Vireo, whose nests show great variations in size and material.

629d. San Lucas Vireo. Lanivireo Soli-Tarius Lucasanus

Range. - Southern Lower California.

Similar to cassini but with the flanks more yellow. Their nesting habits or eggs will not differ from the others.

629a - 632