10. Dendroica cærulea, Wils. ♂ Ohio, 7349.
11. Dendroica cærulea, Wils. ♀ Mo., 6980.
12. Dendroica striata, Forst. ♀ Pa., 978.
This Warbler is an expert flycatcher, feeds chiefly on insects, and is a great devourer of small caterpillars; but in the winter its food is largely composed of berries, especially those of the Myrica cerifera. It will also feed on grass-seeds. In the warmer wintry days in Florida, when insects are abundant, Mr. Audubon states that these birds are particularly active in their pursuit, and the trees seem full of them. At this time they emit, at each movement, a single note, twēēt, so very peculiar that they may be at once recognized by the cry.
Wilson states that these Warblers appear in Pennsylvania, from the North, early in October, and stay there several weeks. Some of them remain in the Southern States all winter. They feed with great avidity upon the berries of the red cedar.