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THE WARBLING FLYCATCHER OR VIREO
ViREO GILVUS, BONAP.
PLATE CXVIII. Male and Female.
While at the little village, now the city, of Camden, in New Jersey, where I had gone for the purpose of watching the passage of certain Warblers on their way north early in the month of May, I took lodgings in a street ornamented with a long avenue of tall Lombardy poplars, one of which almost touched my window. On it too I had the pleasure shortly afterwards of finding the nest of this interesting little bird. Never be- fore had I seen it placed so low, and never before had I an opportunity of examining it, or of observing the particular habits of the species with so much advantage. The nest, although formed nearly in the same manner as several others, which I have since obtained by cutting them down with rifle balls, from the top twigs of the taU trees to which they were attached, instead of being fastened in the fork of a twig, was fixed to the body of the tree, and that of a branch coming off at a very acute angle. The birds were engaged in constructing it during eight days, working chiefly in the morning and evening. Pi-evious to their selecting the spot, I frequently saw them examining the tree, warbhng together as if congratulating each other on their good fortune in finding so snug a place. One morning I observed both of them at work; they had already attached some slender blades of grass to the knots on the branch and the bark of the trunk, and had given them a circular disposition. They continued working downwards and outwards, until the structure exhibited the form of their delicate tenement. Before the end of the second day, bits of hornets"" nests and particles of corn-husks had been attached to it by pushing them between the rows of grass, and fixing them with silky substances. On the third day, the birds were absent, nor could I hear them anywhere in the neighbourhood, and thinking that a cat might have caught them from the edge of the roof, I despaired of seeing them again. On the fourth morning, however, their notes attracted my attention before I rose, and I had the pleasure of finding them at their labours. The materials which they now used consisted chiefly of extremely slender grasses, which the birds worked in a circular form
