It lays its pure white eggs without any nest in crevices of rocks, breeding as late as June near Madeira. _B. macgillivrayi_, with stouter bill, is known from the Fijian waters. Our third group includes the true Storm-Petrels (_Procellaria_) and their close allies the Fork-tailed Petrels (_Oceanodroma_), as well as _Halocyptena microsoma_, a dark blackish bird from Western America, between California and Panama. _P. pelagica_ of the Mediterranean and North Atlantic from Greenland to South Africa, which breeds in Scotland, Ireland, and the West of England, is sooty-black with the tail-coverts white, except at the tips, and a little white on the wing-coverts. Named Mother Carey's Chicken by sailors, who look upon it with superstitious dread, it is often seen paddling along the waves in {68}stormy weather, thus gaining the name of "Petrel" from the Apostle Peter; while it may be heard singing among the boulders towards the end of June in Scotland, where it breeds more than a month later than the "Lyrie" or Manx Shearwater. The note is shrill and the flight somewhat butterfly-like. _P. tethys_, of the Galapagos and Western Central America, has entirely white tail-coverts. _Oceanodroma_ contains ten members inhabiting the northern hemisphere, and ranging southwards to Peru and St. Helena, all being sooty-black except _O. furcata_, which is chiefly ashy-grey, and _O. hornbyi_, which is brown, with white collar, forehead, and under surface, and blacker head and wings. _O. leucorrhoa_ (Leach's Petrel) and _O. cryptoleucura_ possess white tail-coverts tipped with black; the former having some breeding stations in Britain at St. Kilda and a few islands on the west of Scotland and Ireland, and the latter as far north as Madeira, though it extends to St. Helena, the Galapagos, and the Sandwich Islands, and has recently occurred in England. The other species are apparently met with only in the Pacific north of Panama, while in habits the genus is not dissimilar to _Procellaria_. [Illustration: FIG. 19.–Storm-Petrel. _Procellaria pelagica._ × ⅖.] Sub-fam. 4. _Pelecanoïdinae._–These Diving-Petrels include _Pelecanoïdes urinatrix_, of the vicinity of Australia, New Zealand, Cape Horn, and the Falkland Islands, a glossy black bird with white under parts, some grey on the sides of the neck, and grey and white on the scapulars; _P. exsul_, of the Southern Indian Ocean, with grey throat; and _P. garnoti_ of Western South America, {69}which is larger and quite white below. Of the first Darwin says[71] that it "never leaves the quiet inland sounds. When disturbed it dives to a distance, and, on coming to the surface, with the same movement takes flight. After flying by the rapid movement of its short wings for a space in a straight line, it drops as if struck dead, and dives again." The egg is deposited in a small burrow; the note is a cackle or moan.