434 



a. Ad. sk. 



h. Juv. sk. 



c. (5 imm. sk. 



1^. Juv. sk. 



e,f. Ad. et juv. sk. 



g-i. Ad. et juv. sk. 

 'k. $ ad. sk. 

 /. (5 iiiim- sk. 



m. 5 imm. sk. 

 w. Juv. sk. 



0. Imm. sk. 



p. Juv. sk, 

 7. 5 ad. sk. 



'■• 6 juv. sk. 



.t. d' ad. sk. 



/-I'. Imm. et ]uv. 



sk. 

 zo-y. S ad., 2 juv., 



et pull. sk. 

 z. $ ad. sk. 



a', b' . Imm. et iuv. 



sk. ^ 



c'. Ad. sk. 



d'. Juv. sk. 

 e'. 2 juv. sk. 



/'. Juv. sk. 

 ff'. Ad. sk. 

 A'. Ad. sk. 

 i'-l'. Ad., imm. et 



juv. sk. 

 m', n'. Skeletons. 



0'. Sternum. 



Krusenstern Rocks, North 

 Pacific (0. Snow). 



Maldou I., 25° S. of Sand- 

 wich Is. (A. Camjjibell). 



Howland I. {J. H. Gumcy). 



Samoa Is. 



Fijian Seas. 



Queensland (J. T. Cockerell). 

 Raine I., N.E. Australia. 

 Raine I., May 29. 



Seehohm Coll. 

 Seebohm Coll. 



Hume Coll. 



Rev. J. B. Stair [P.]. 



Voyage of H.M.S. 

 '"Herald '. 



Salvin-Godman Coll. 



' Challenger ' Exped. 



Voyage of ' Rattle- 

 snake.' 



' Challenger ' Exped. 



Steere Coll. 



At sea off Cape York, Aug. 29 

 Avala, Mindanao, Philippine 



Is., Oct. 11 (J. B. S.). 

 At sea off Cochiu China Seehohm Coll 



{Michie). 

 Sandakan, N.E. Borneo. 

 Christmas I., Indian Ocean. 



Nassau I., S. of Sumatra, 



August (T)r. Coppinger). 

 Diego Garcia, Indian Ocean. 



Seychelles, March 18-20 



(E. Bowker). 

 Farquhar I., August {G. 



Stevens). 

 Rodriguez {H. H. Slater). 



Mauritius {Beivsher). 



I. of Trinidad, Lat. 20° 23' S., 

 Long. 24° 43' W., Aug. 20. 

 Redonda I., W. I. (Spence). 

 St. Vincent, W. I., Jan. 



Jamaica {W. Osburn). 

 Jamaica. 



Honduras {Dyson). 

 Half-Moon Key, British 

 Honduras, May 9 (0.&). 

 Rodriguez {H. H. Slater). 



Sula variegata. 



Governor Ussher[P.]. 

 Capt. Maclear, R.N. 



[P-]- 

 Voyage of H.M.S. 



'Alert.' 

 G. C. Bourne, Esq. 



[P.]. 

 Hume CoU. 



Howard Saunders, 



Esq. [P.] 

 Transit of Venus 



Exped. 

 Shelley Coll. 



Earl of Crawford 



Salvin-Godman Coll. 

 G. Stephens, Esq. 



[C.]. 

 Salvin-Godman Coll. 

 Gould Coll. 

 Cuming Coll. 

 Salvin-Godman CoU. 



Transit of Venus 



Exped. 

 ' Challenger ' Exped. 



Sula sp., Fraser, P. Z. S. 1843, p. 120 [Chili]. 



Dysporus variegatus, Tschiidi, Faun. Peru., Orn. p. 313 (1845) ; id. 



J.f. O. 1856, p. 188. 

 Sula cyanops, JReirhenh. Nntatores, pi. xxix.*^ nos. 2289-90 (1850). 

 Sula variegata, IIu77ie, Str. F. v. p. 317 (1877) ; Salvin, P. Z. S. 



1883, p. 427 [Peru] ; Ridr/tv. Man. N. A. B. p. 75 (1887) ; Tacz. 



Orn. Perou, iii. p. 433 (1886) ; Berlepsch ^ Stolzm. P. Z. S. 1892, 



p. 399 [Peru]; Lane, Ibis, 1897, p. 185 [Chili]. 



Adult. Entire plumage pure white, except the primaries and 



