Vireo philadelphicus
Order Passeriformes
Family Vireonidae
Adult.— Upper parts grayish, tinged with green in strong light; top of head clear gray; cheek gray; a whitish line over eye; under parts distinctly but not strongly tinged with yellow.
Nest and eggs, like those of the Red-eyed Vireo, but slightly smaller.
The Philadelphia Vireo breeds from northern New England northward, and in most of New York and New England occurs only as a very rare migrant, generally in September or early October. In northeastern Maine, in the vicinity of Lake Umbagog, and at Dixville Notch, N. H., it is not uncommon. Here it frequents the thin growth of poplar and bird-cherry in clearings and along roadsides rather than the deeper woods. A male sang constantly in June, 1903, in a group of birches almost under the eastern windows of The Balsams, at Dixville Notch.
The song is at times identical with that of the Red-eyed, though generally a little more languid. One phrase suggests, in form, but not at all in power and sweetness, the double note of the Solitary Vireo. The scolding-note is a harsh twee-twee-twee, which closely resembles that of the Warbling Vireo.
A good look at the bird should leave no doubt of its identity; the side of the head resembles the Warbling Vireo instead of the Red-eyed, but the entire under parts, particularly the breast, are distinctly tinged with yellow. (See Brewster, “ Auk,” 1903, p. 369, and Dwight, “ Auk,” 1897, p. 259.)
Hoffmann – A Guide to the Birds of New England and Eastern New York (1904)