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THE YELLOW-POLL WARBLER.
Sylvia æstiva, Gmel.
PLATE XCV. Male.
As soon as the welcome note of the Purple Martin is heard in spring, on its return to the United States, which, in Louisiana, sometimes takes place early in March, the little Warbler here presented to your inspection follows, and is seen gaily moving from tree to tree, feeding on the smaller insects, and tuning its pipe, which, however, is not the most melodious. It approaches the gardens and orange-groves, and again flies off to the willows, along the margins of the pools and lagoons. Its sojourn is of short duration in Louisiana, for it moves gradually eastward as the season advances, leaving nothing but the recollection of its passage through the land. Its migration, in as far as I have been able to ascertain, is principally performed during the night. I have observed many in the course of one day in a place, which, next day, if the weather had become warm, scarcely contained a single individual. It never breeds in the district mentioned above, nor even in the State of Mississippi. A few breed in Kentucky, more in Ohio, and their nests in this manner increase the farther you proceed eastward. I have seen many of these birds, as well as their nests, on the Genessee River; but in the States of New York, Connecticut, Pennsylvania, Maryland, and Virginia, they may be found in every orchard and garden, and even in the streets, among the
foliage of our trees.
The males chase each other with great courage, and fight for a few moments, to establish their claim to any particular spot or tree, after which they are seen climbing up and down among the twigs and smaller branches, looking keenly among the leaves and blossoms for insects. Careless of the presence of man, the Blue-eyed Warbler is easily approached. The same carelessness makes it build its little nest almost always within reach of the latter. The parents are very assiduous in the discharge of their duties. They construct a nest about the middle of May, in the forked branches of a small tree, often within a few paces of a house. The nest is strongly fastened to the twigs, is for-
