The Cave Swallow does not appear to be in any degree migratory in Jamaica, being abundantly common at all seasons. It delights in the neighbourhood of caverns and overhanging rocks, in the hollows of which it builds its ingenious nest. About a mile from Bluefields, the sea washes a precipitous rock of no great height, on the summit of which is an old fort, with some great guns, which tradition ascribes to the old Spanish settlers, but now dismantled, and within and without overrun with spiny pinguins and logwood bushes, and tangled with creepers. I have no doubt that this was the site of the Spanish town Oristana, some remains of the houses of which may yet be seen in the provision ground of a negro peasant adjoining. The foot of the cliff is girt with irregular masses of honey-combed rock, between which the incoming tide rolls, and frets, and boils, in foaming confusion; and the front is hollowed into caves, some of which are long passages with an opening at each end, and others are merely wide-mouthed, but shallow hollows. In one of these I counted forty nests of this species of Swallow, each consisting of a half cup, built with little pellets of mud, retaining, in so damp a situation, and where the rock itself is covered with a slimy mouldiness,—their original humidity. Each was thickly lined with silk-cotton. If we imagine a pint basin divided perpendicularly through the middle, and the one-half stuck against a wall, we shall perceive the form of these nests; some, however, were both larger and deeper than this. In many instances advantage was taken of a slight hollow in the rock, which increased the capacity. In one, (it was about the middle of July,) I found three eggs; in some others the callow young, and in one two full fledged birds, which lay quietly in the nest, side by side, while their black eyes watched my motions. The parent birds flew about in affright, occasionally coming close up to the nests, and hovering as if about to alight, but scarcely one ventured in. The eggs measure about ⁸⁄₁₀ inch long, and ¹¹⁄₂₀ wide; they are white, studded with dots and spots of dull red; but in many eggs which I have examined there is much variation in size, form, and colour. The young birds scarcely differed from the adult. In May, my kind friend Mr. Aaron Deleon, took me to a curious cavern, situated on the estate called Amity, some few miles from Savannah le Mar, but inland. Through its dark recesses a subterraneous river flows, so still and so perfectly transparent, that although two or three feet deep, I did not perceive that there was a drop of water there, but took the atoms floating on its surface, to be lodged in invisible spiders’ webs, stretched across. Numerous Swallows were flying in and out, and the roof was studded with nests similar to those above described.