Smaller than the Red-eye, without black and white lines over the brown eye, the underparts faintly tinged with yellowish. L. 5¾.
Range. Nests from Louisiana and North Carolina to Canada; winters in the tropics.
Washington, rather common S.R., Apl. 21-Sept. 12. Ossining, tolerably common S.R., May 3-Sept. 18. Cambridge, locally common S.R., May 5-Sept. 15. N. Ohio, abundant S.R., Apl. 17-Oct. 10. Glen Ellyn, not common S.R., May 1-Sept. 15. SE. Minn., common S.R., May 3-Sept. 15.
While the Red-eye's song lasts the greater part of the day, the Warbling Vireo's continues for only about four seconds, then, after an interval, it is repeated. It is an unbroken strain running up and down the middle of the scale and has it in a reminder of the Purple Finch's lay. This species is less generally distributed than the Red-eye. It may be common in one locality and absent from another. Its nesting habits and eggs are much like those of the Red-eye, but the male has the singular custom of singing while it sits upon the nest.
PHILADELPHIA VIREO
Vireosylva philadelphicus. [Case 7], Fig. 30
A small, olive-green Vireo, with pale yellow underparts and a whitish line over the eye. L.
Range. Nests from northern New England and northern Michigan into Canada; winters in the tropics.
Washington, very rare T.V., May; Sept. Ossining, rare T.V., Sept. 20-Oct. 20. Cambridge, rare T.V. Glen Ellyn, rather rare T.V., May 14, 15; Aug. 21-Sept. 30. SE. Minn., uncommon T.V., May 9.
Rarest of our Vireos; but few students know it as a migrant and fewer still as a nesting bird. Its song and nesting habits resemble those of the Red-eye.
YELLOW-THROATED VIREO
Lanivireo flavifrons. [Case 6], Fig. 69