At the same time, I should observe, that Mr. Hill thinks that _Acanthylis pelasgia_ visits Jamaica in its periodical migration. Referring to an incident which he had mentioned to me before, he says, “The migratory _hirundines_, whose squadrons moving in circles, I gave you a sketch of in March last, as seen by me at that time passing over us from south to north, (and I have observed them yearly either in that month or in April,) I conclude to be flocks of _pelasgia_ on their passage to their summer homes northward, after wintering in the tropics. The circular movement of the migratory retinue; the direction of their flight; their known wintering on the neighbouring intertropical shores; their association at all times in multitudinous numbers; and the cry with which they announce their passage, as they leisurely course round,—_tsippee, tsippee, tsippee_, seem to me so many identifications of this species.” The Blue Swallow has the same propensity to bring up his family in darkness, as his purple brother. The stipe of an old palm, whose porous centre decays, while the iron fibres of the exterior remain strong, is his ordinary resort. At the beginning of April, I observed several pairs flying in and out of holes, bored I suppose by the Woodpecker, in the stipe of a dead Cocoa-nut still tall and erect, but a mere leafless post, tottering in the breeze and ready to fall. At the middle of May, Sam observed several pairs entering a round hole, about two inches in diameter, beneath the eaves of Belmont house.