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-like. P. 

 tethys, of the Galapagos and Western Central America, has 

 entirely white tail-coverts. Occnnodroma contains ten members 

 inhabiting the northern hemisphere, and ranging southwards to 

 Peru and St. Helena, all being sooty-black except 0. furcata, 

 which is chiefly ashy-grey, and 0. hornhyi, which is brown, with 

 white collar, forehead, and under surface, and blacker head and 

 wings. 0. leucorrhoa (Leach's Petrel) and cryj)toleucura possess 



Fig. 19. — Storm-Petrel. PriM-rlhu-ia pdaijica. x f . 



white tail-coverts tipped with ])lack ; the former having some 

 Ijreeding stations in Britain at St. Kilda and a few islands on the 

 west of Scotland and Ireland, and the latter as far nortii 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. Felecano'idinae. — These Diving -I'etrels include 

 Pelecano'ides 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. exstd, of the Southern Indian Ocean, 

 with grey throat ; and P. gicrnoti of Western South America, 



