Specimens of the eggs of these three species of Tern, procured at the Kays by George Wilkie, Esq., who kindly furnished the above information to Mr. Hill for the benefit of this work, are now before me. There is scarcely any difference in size, the dimensions being 2 inches by 1³⁄₈: the Noddy’s, however, is of a more conical form. The ground of all is white; that of the Noddy has a few blackish specks thinly scattered over it, and at the larger end some irregular splashes of brown. That of the Sandwich Tern is uniformly speckled with dull reddish-purple; while that of the Egg-bird is marked with the same hue in fewer but larger spots. * * * * * To the above _Laridæ_, Mr. Hill adds _Sterna argentea_ (+Bonap.+) killed in Kingston Harbour; and _Hydrochelidon nigra_ (+Boie+) and _Xema atricilla_ (+Bonap.+) as frequenting the Kays. Of two other birds he thus gives me indications:—“A curious bird of the family _Procellariadæ_ (the Petrels,) was found in the Rio Grande in Portland after the late storms [in the autumn of 1846.] Hurricanes introduce into these islands new birds, and disperse those peculiar to these islands into other localities.” The other seems to be of the family _Alcadæ_ (the Auks). “In the Blue Mountains, high up towards their summits, is a curious _burrowing_ bird, which they call the Blue-Mountain Duck. It is described as having webbed feet, and a hooked parrot-bill. This description would indicate a species of _Alca_. It inhabits holes in the cliffs, and is said to burrow to the extent of ten feet. Nothing is known of its habit of feeding. E. M^cGeachy, Esq., Crown Surveyor for the county of Surrey, first informed me of the existence of such birds. He had himself taken them from their burrows. The facts have also been assured to me by other observers.” A specimen of this bird is said to be in the possession of George Atkinson, Esq., of Newcastle-on-Tyne, who, in answer to an application from me, kindly promised me a particular description; but other engagements, probably, have not yet afforded him the necessary leisure. +Fam.+—COLYMBIDÆ. (_The Divers._) BLACK-THROATED GREBE.[137] _Podilymbus Carolinensis?_ _Podiceps Carolinensis_, +Lath.+—Aud. pl. 248. _Podilymbus Carolinensis_, +Less.+ _Sylbeocyclus Carolinensis_, +Bonap.+