Ti. Petrels from the North-East Pacific Ocean. 607 



of importance. The formation of the bill and skull recall 

 Piujodruma to us, and the opposition of coloration is very 

 remarkable if these two should prove closely allied. It 

 seems, as does Pagodroma, to be related to Pterodroma more 

 nearly than to any other genus. 



Bulweria bulweri pacifica, subsp. n. 



Type, labelled "Iwojima, Bonin I. ,$ , 15/7/11. Bulweria 

 buhceri." 



Culmen 23, wing 210, tail 119, tarsus 27*5, mid-toe 

 27'5 mm. 



We separate the Pacific-breediug Bulwer's Petrel on 

 account of its stronger bill, no other difference being 

 apparent : the coloration agrees very closely with Atlantic 

 specimens, and there is very little variation in size. Two 

 other birds received measure : — 



" Iwojima, Bonin Is. r^ , 15/7/11. Bulweria bulweri." 



Culmen 23, wing 206, tail 105, tarsus 27, mid-toe 27 mm. 



"Iwojima, Bonin Is. ?, 15/7/11. Bulweria bulweri." 



Culmen 22'5, wing 206, tail 109"5, tarsus 27, mid-toe 

 27 mm. 



We made our comparisons with specimens from Madeira, 

 the type-locality of P. bulweri Jardiue & Selby, and noted 

 that Atlantic Island birds generally agreed with these, 

 while other Bonin Island birds and birds from Foochow, 

 China, agreed with our Pacific birds. We now note that in 

 the ' Ibis,' 1914, p. 268, Bannerman gives measurements of 

 Canary Island series thus : 



22 males — Culmen 20*5-23, wing 187-205 (average 

 196-5), tarsus 25-5-28 mm. 



4 females — Culmen 20-5-21, wing 191-200 (average 

 195-5), tarsus 26*5-27-5 mm. 



It will be noticed that our three specimens are all larger 

 in the culmen and wing than the Canary Island birds. 

 Bannerman, in the 'Ibis,^ 1914, pp. 488-494, remarks on 

 the discontinuous distribution of this species, occurring in 

 the eastern Atlantic and then recurring in the north Pacific, 

 and comments upon it. The most peculiar fact, however. 



