“I have seen the same bird twice or thrice since, but in threes or fours only, and, always, only near rocky and unfrequented hills. Another friend, who drew my attention to them in consequence of their numbers after rains, in his neighbourhood, lived among large open savannas and salt-ponds, near the low range of rocky and sterile mountains, which our maps call the Healthshire hills. He told me he had traced them to the caverns in those mountains, in which he felt assured they nestled in hundreds. This is the nearest to any precise information, I ever could get of their haunts and habitations.” I am not alone in thinking these birds difficult to shoot; a gentleman who resides near Kingston, having observed them at his residence one evening, the last spring, and kindly wishing to supply me with a specimen, though an expert shot, fired five times unsuccessfully at them. Yet I am not without hope of obtaining specimens, particularly through the politeness of Mr. A. G. Johnston of Portland. In answer to some observations of Mr. Hill’s, this gentleman writes, “The ring-necked Swallow abounds here, and flies all day, just as the other Swift does. Flocks of a hundred or two of each, wheel and scream about us before a shower. I have a specimen before me, which I stuffed sixteen years ago, pretty perfect yet, but I propose to shoot you some fresh birds. I find no difficulty in bringing them down, but I never saw one alight or perch anywhere.” It is with doubt that I identify this bird with the “White-necked Martin” of Temminck, found by the Prince de Nieuwied in his voyage to Brazil. He states it to be very common in the environs of Rio Janeiro, and in all the districts of that province, where “_it is found among rocks_.” Perhaps it is Hirundo 3, of Browne. When the above was just going to press, I received from Mr. Hill information that a specimen of this bird had been obtained by Mr. Johnston. A careful drawing of the left foot accompanied it, with the following note. “The legs are curiously constructed: the tarsus cannot _extend_ further than here represented, [viz. forming an angle with the tibia, of 28°] nor can it be straightened, so that it corresponds with the tail feathers, and keeps the bird in an upright position against vertical rocks and trees.” Mr. J. ascertained that from this formation, the bird cannot stand erect on the ground, nor can it apparently walk; and he has been told that cattle-boys and fishermen in Portland both say that they have taken young ones of this species _clinging_ to the vertical honey-comb rocks, against whose base the sea dashes. As the specimen thus procured is kindly destined for me, I hope to speak still more definitely, if it arrive in time, in an appendix. Perhaps it may form a new genus.