OCEANODROMA 845 



ad. (Bay of Fundy). General colour sooty blackish brown, the head, 

 breast, and back tinged with grey ; inner secondaries and wing-coverts 

 brownish grey, paler at the tips ; upper tail-coverts white, some with 

 narrow dark edges ; tail forked ; lateral under tail-coverts white, the 

 central ones sooty brown ; bill and feet black ; iris dark brown. 

 Culmen 075, wing 6'0, tail 3'5, tarsus TO, bare portion of tibia 0*3 

 inch. 



Hctb. Seas of Northern Europe, Asia, and America, wander- 

 ing south in winter to the coasts of continental Europe and 

 the Mediterranean ; of rare occurrence in Scandinavia ; Eastern 

 Siberia, the Commander Islands, and Japan ; the Atlantic and 

 Pacific coasts of N. America ; south to Virginia and California. 



In habits it resembles P. pelagica, and is, like that bird, 

 essentially oceanic. It breeds on many of the Hebrides, and 

 on the islands off the east coasts of North America, selecting in 

 preference grassy places where it can burrow under the sods, 

 but it also burrows under rocks. Early in June a single egg 

 is laid, which is like that of P. pelagica but larger, measuring 

 about 1'33 by 0'95. The nest is a small pad of dry grasses 

 placed at the end of the nest-hole. 



1160. HARCOURT'S PETREL. 

 OCEANODROMA CASTRO. 



Oceanodroma castro (Harcourt), A Sketch of Madeira, p. 123 (1851) ; 

 Ogilvie Grant, Ibis, 1898, p. 314 ; Saunders, p. 731 ; 0. crypto- 

 leucura, Eidgway, Proc. U.S. Nat. Mus. iv. p. 337 (1882); id. 

 Manual, p. 71 ; Dresser, ix. p. 395, pi. 718 ; Scott Wilson, Aves 

 Haiwaiiensis, p. 209 and pi. ; (Lilford), vi. p. 130, pi. 55. 



ad. (Porto Santo). Differs from 0. leticorrlwa in being rather 

 browner in tone of colour, the tail less deeply forked, all the feathers but 

 the middle ones white on the basal quarter ; upper tail-coverts white 

 tipped with black. Culmen 0'85, wing 6'0, tail 2*8, the middle feathers 

 0'2 shorter than the lateral ones, tarsus 0'85 inch. 



Hob. Sandwich and Galapagos Islands, and the South Atlantic 

 Ocean, breeding as far north as the islets between Cape Verde 

 Islands and Madeira ; has once strayed to England and twice 

 to Denmark. 



In habits it does not differ from its allies, and, like those, 

 breeds in holes, depositing in June a single egg, which is white, 

 sometimes with a wreath of red spots round the larger end, 

 and in size measures about 1*26 by 0*98. 



