On the 20th of March last, visiting in company with Mr. Hill the estate called Dawkins’ Saltpond, the residence of the Spanish Admiral, at the time of the conquest,—I observed several small Swallows flying above some cocoa-nut palms; they uttered, as they flew, a continued twittering warble, shrill but sweet, which attracted my attention. I commenced a careful search, with my eye, of the under surface of the fronds and spadices of one, and at length discerned some masses of cotton projecting from some of the spathes, which I concluded to be their nests. This conjecture proved correct; for presently I discovered a bird clinging to one of these masses, which I shot, and found to be this White-rumped Swift. On my lad’s attempt to climb the tree, eight or ten birds flew in succession from various parts, where they had been concealed before. The tree, however, was too smooth to be climbed, and as we watched beneath for the birds to return, one and another came, but charily, and entered their respective nests. Although several other cocoa-nuts were close by, I could not discern that any one of them was tenanted but this, and this so numerously, whence I inferred the social disposition of the bird. At some distance we found another tree, at the foot of which lay the dried fronds, spadices, and spathes, which had been, in the course of growth, thrown off, and in these were many nests. They were formed chiefly in the hollow spathes, and were placed in a series of three or four in a spathe, one above another, and agglutinated together, but with a kind of gallery along the side, communicating with each. The materials seemed only feathers and silk-cotton (the down of the _Bombax_); the former very largely used, the most downy placed within, the cotton principally without; the whole felted closely, and cemented together by some slimy fluid, now dry, probably the saliva. With this they were glued to the spathe, and that so strongly, that in tearing one out, it brought away the integument of the spathe. The walls of the nests, though for the most part only about a quarter of an inch thick, were felted so strongly, as to be tenacious almost as cloth. Some were placed within those spathes that yet contained the spadices; and in this case the various footstalks of the fruit were enclosed in a large mass of the materials, the walls being greatly thickened. All the nests were evidently old ones, for the _Bombax_ had not yet perfected its cotton, and hence I infer that these birds continue from year to year to occupy the same nests, until they are thrown off by the growth of the tree. The entrance to the nests, which were subglobular, was near the bottom.