11. avals. 



151 



seldom obtained. It is not improbable that the rectricea may be 

 longer in the male ; otherwise the sexes are alike in plumage. 



Immature. Like the above, but the shafts of the primaries and 

 rectrices are darker. 



Young. Feathers white, with dark shafts to the quills. In a 

 bird scarcely fledged, the forehead and mantle are tinged with 

 clove-brown, and filamentous down of that colour hangs about 

 upper parts, becoming darker on the nape, also on the chin. These 

 brown markings rapidly pass away. 



Hub. Fernando ^Toronha, Trinidad and Martin Vas Islets, Ascen- 

 sion, St. Helena, Madagascar, Mascarene Islands and vicinity, 

 Chagos group, Bay of Bengal, Malayasia to Australia, Polynesia to 

 Ducie Island, and the Central Pacific generally, up to the Sandwich 

 Islands and Krusenstern Islets. 



a, b. Ad. ; c. .Juv. 



sk. 

 d, e. S ad. sk. 



/. Ad. sk. 



//. Ad. sk. 

 h. Ad. sk. 

 i, k. (5 5 ad. sk 



Fernando Noronha Id., N. 



Brazil. 

 Fernando Noronha Id., N. 



Brazil, Se])t. (H. M. Harri- 

 son, R.N.). 

 Trinidad Islet, S. Atlantic, 



20° 23' S. lat., 40° 4:5' W. 



long., Aug. 1. 

 Triuidad Islet, S. Atlantic 



[Earl of Crawford). 

 Ascension Id., South Atlantic 



{Prof. D. Gill). 

 Ascension Id. 



/. Imm. sk. Rodriguez Island. 



m, w. c5' 5 ad. sk. Rodriguez Island. 



o. Ad. sk. 



p, q. S ad. sk. 

 r. Ad. ; s, t. Juv. 



sk. 

 u. Ad. sk. 



V. Ad. sk. 

 to. Ad. sk. 



x-z. 2 ad. sk. 



a', h' . Ad. et juv. 



sk. 

 e'. Juv. sk. 

 d\ Ad. sk. 

 e', /. Ad. ; (f. 



Juv. sk. 

 h',i'. 6 5 



sk. 

 A:', /'. $ ad 



m . Ad. sk. 



ad. 



sk. 



Seychelles Is., March {Dr. 

 Coppinger). 



Seychelles Is. 



Cocos or Keeling Is., S. Indian 

 Ocean, Jan. [H. O. Forbes). 



Pelew or West Caroline Is. 

 {Capt. Peters). 



Pelew or West Caroline Is. 



Norfolk Island {Rev. P. Met- 

 calfe). 



Eua, Tonara Islands, Feb. {E.L. 

 Layard) .■ 



Samoa. 



Samoa {Krause). 

 Society Islands. 

 Raiatea, Nov. (./. Youmj). 



Tahiti. Nov. {J. Yuwiy). 



Tahiti. 



Ducie Island, 24° 40' S., 

 124°48' W., March (breeding) 

 (Commr. MncFarlane). 



H. N. Ridley, Esq. 



[P.]. 

 11. Saunders Coll. 



EarlofCrawf<n-d[P.]. 



H. Saunders Coll. 

 II. Saunders Coll. 



H.M.S. ' Challenger ' 



Exped. 

 Sir John Kirk [P.]. 

 Rev. H. II. Slater 



[CI. 

 Voy. H.M.S. ' Alert.' 



Shelley Coll. 



H. Saunders Coll. 



H. Saunders Coll. 



J. Cohen [C.]. 

 H. Saunders Coll. 



Tweeddale and See- 



bohm Colls. 

 Rev/J.Whitmee[C.]. 



II. Saunders Coll. 



Hume CoU. 



H. Saunders Coll. 



H. Saunders Coll. 



H.M.S. ' Challenger ' 



Exped. 

 H. Saunders Coll. 



