68 PROCELLARIIFORMES CHAP. 
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-lke. PP. 
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. 0. leucorrhoa (Leach’s Petrel) and 0. eryptoleucura possess 
Fic. 19.—Storm-Petrel. Procellaria pelagica. 
oo 
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. 
Sub-fam. 4. Pelecanoidinae—These Diving-Petrels include 
Pelecanoides 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. ewsul, of the Southern Indian Ocean, 
with grey throat; and P. garnoti of Western South America, 
