Oporornis agilis
Order Passeriformes
Family Parulidae
♂ Adult male.— Head, neck, and upper breast ash-gray; ring around eye white; back, wings, and tail brown, tinged with greenish-yellow in strong light; belly bright yellow.
♀ Adult female and Immature.— Upper parts, wings, and tail brown, tinged with greenish-yellow in strong light; throat and upper breast brownish; rest of under parts yellow; ring around eye brownish-white.
Nest, a soft cup, generally in the crotch of a tree or sapling from ten to thirty feet up.
Eggs, thickly spotted with dark brown, chiefly around the larger end.
The Connecticut Warbler is a rare fall migrant through New England and the Hudson Valley, occurring in the latter half of September and in early October. In the swamps about Fresh Pond in Cambridge, Mass., it is sometimes common. In such places it feeds in the jewel-weed (Impatiens), great masses of which grow in the wet soil. In western Massachusetts it occurs in rather dry lanes. It is more leisurely in its behavior than its relative the Maryland Yellow-throat, and when disturbed often flies to some low limb near by, where it sits quietly. An adult in full plumage is rare, but the bird may always be distinguished from the female Maryland Yellow-throat [Common Yellowthroat] by its throat, which is brownish where the other species is yellow, and by its bright yellow under parts. If the bird is seen at close range, a whitish eye-ring is visible.
Hoffmann – A Guide to the Birds of New England and Eastern New York (1904)