I have never met with the nest of this species; but Sam informed me in June that he had observed one near Morgan’s Bridge, in Westmoreland. It was on a dead tree, and was placed _upon_ a twig, but being full fifteen feet from the ground he could not examine it. He, however, saw the Mango Humming-bird fly out of it, and presently return. A nest, presented to me by my friend Mr. Hill, ticketed as that of Mango, is now before me. It has evidently been constructed to stand upon a horizontal twig, which the bottom has embraced. It is cylindrical externally, the bottom being nearly flat. Its height is 1¹⁄₂ inch; its external diameter a little more; its internal diameter about 1 inch; the hollow, which is a little overhung by the margin, is cup-shaped, about ⁷⁄₈ inch deep. It is composed almost entirely of the down of the gigantic silk-cotton tree, (_Eriodendron anfractuosum_) intermixed at the bottom with a little true cotton. The sides are tightly banded round with the threads of spiders’ webs, very neatly put on, and the whole exterior is studded with a minute whitish lichen, so profusely as almost entirely to conceal the down, without at all injuring the symmetry of the form. It is a most compact and beautiful little structure. The down of the cotton-tree is the material ordinarily chosen by all our Humming-birds for the construction of their nests. The tree attains a giant size and diameter, and throws out to a vast distance its horizontal limbs, each equalling in its dimensions an ordinary forest tree. It is one of the few in those tropical islands, which are deciduous: the fierce blasts called “norths,” which prevail in January and February, pouring down from the mountains, quickly lay it bare. I have seen an enormous tree in full foliage, almost leafless in an hour; the leaves filling the air, like flakes of snow in a driving storm. While it is yet denuded, the pods appear at the ends of the branches, resembling green walnuts: these ripen before the leaves bud, and opening, give freedom to a mass of fine silky filamentous down, which is borne away upon the wind. The filaments are so fine, that at this season, April and May, they are imbibed with the air we breathe, being almost impalpable, and are considered to aggravate pulmonary affections. The tufts so scattered, the Humming-birds and others of the feathered tribes, diligently collect, and that not only on the ground. I have been amused to observe a Mango Humming-bird suspending himself in the air, over against a puff of down, which was slowly borne along upon a gentle breeze, picking at it and drawing filaments from it, doubtless with a view to nest-building. LONG-TAILED HUMMING-BIRD.[23] _Trochilus polytmus._ _Trochilus polytmus_, +Linn.+ _Ornismya cephalatra_, +Less.+—Ois. M. xvii.