438 suLiDJs. 



1896, p. 40 i' Aden ; Red Sea]; Chohnleij, Ibis, 1897, p. 209 [Red 



Sea] ; Alexander, Ibis, 1898, pp. 89, 93, 99, 100, lOo, 108, 114, 117 



[Cape Verde Is.]. 

 Ujsporus brasiliensis, Riipp. Vog. N.O.-Afr. p. 140 (1845) [Red 



Sea]; Heuffl. Vog. N.O.-Afr. y>. 71 (1856). 

 Sula leucogastra, Sclat. Sf Salv. P. Z. S. 1878, p. 651 [Ascension : St. 



Paul's Rocks] ; Penrose, Ibis, 1879, pp. 275, 281 [Ascension] ; 



Legge, B. Ceylon, iii. p. 1177 (1880); lidut. 4" 8ali\ Voy. ChalL, 



Zool. pt. ix. p. 119 (1880) ; Blakist. ^- Pryer, Tr. As. Soc. Jap. x. 



p. 102 (1882) [Benin Is.]; .Sahad. Orti. Pap. iii. p. 421 (1882); 



Cones, Key N. Amer. B. p. 720 (1884) ; Baird, Breic. <^- Ridgw. 



Water-B^N. Amer. ii. p. 178 (1884) ; Co)-y, B. Haiti Si S. Domingo, 



p. 171 (1885J ; Blasius, Ornis, 1888, p. 633 [Saughir] ; Ramsay, 



Tab. List Austr. B. p. 24 (1888) ; Sharpe, J. Linn. Soc, Zool. xx. 



p. 480 (1888) [Fernando Noronha] ; North, Nests 8) Eggs B. Austr. 



p. 364 (1889) ; Seehohm, B. Jap. p. 212 (1890) ; Wiglesiv. Abh. 



Mus. Dresd. 1890-91, p. 72; Seebohm, Ibis, 1890, p. 107 [Bonin 



Is.], 1891, p. 192 [Volcano Is.l ; Lister, P. Z. S. 1891, pp. 294, 



300 [Phoenix Is.]. 

 Dysporus parvus, Bonap. Consp. Av. ii. p. 104 (1855). 

 Sula sula, Verr. ^- Des Murs, Rev. Mag. Zool. 1860, p. 442 [New 



Caledonia] ; Ridgw. Man. N. A. B. p. 75 (1887); Cory, Auk, v. 



p. 72 (1888) [Antilles] ; id. B. W. Ind. p. 273 (1889) ; Scott, Auk, 



vii. p. 307 (1890) ; Cory, Cat. W. Ind. B. p. 84 (1892) ; Rothsth. 



Avif. Laysan, pt. i. p. 29 (1893) ; A. O. U. Check-l. p. 40 (1895). 

 Sula sinicadvena, Swinhoe, Ibis, 1865, p. 109 [near Foochow], 

 Dysporus fiber, Gnndl. J. f. O. 1875, p. 402 [Cuba: habits]; 1878, 



p. 191 [Porto Rico]. 



Adult. Head, neck, chest, entire upper parts, wings, and tail dark 

 sooty -brown ; breast, rest of the underparts, axillaries, and the 

 under wiug-coverts of the secondaries pure white. Tail composed 

 of 14 feathers. Iris silvery white, white, or grey; bill whitish 

 green or greenish blue, becoming flesh-coloured or bluish at the 

 base; naked skin on sides of face and gular pouch bluish, greenish, 

 or yellowish ; legs and feet pale green or lead-green, sometimes 

 inclining to yellowish. 



Adult male. Total length about 23 inches, culmen from feathers 

 on forehead 3*85-;i-9, wing 14-14-9, tail 7-5-7'9, tarsus 1-6-I-7. 



Adidt female. Total length about 28 inches, culmeu from feathers 

 on forehead 4, wing 15-3-lo"6, tail 7o-7'7, tarsus l-8-l'9. 



Immature in Jirst plmnage. Differs in having the head, neck, 

 chest, entire upper parts, wings, and tail brown, much lighter 

 than in the adult ; the breast, belly, and underparts still paler 

 brown, the feathers fringed with whitish brown, and generally 

 shai'ply defined from the darker chest; axillaries and secondary 

 under wiug-coverts mixed with smoky-brown. 



In more mature birds (? plumage of the second year) the breast, 

 beUy, and underparts are largely mixed with white, only the 

 subtermiual portion of each feather being smoky-brown. 



In a still more mature bird. (? plumage of the third year) the 

 head, neck, chest, and upper parts are darker brown, and more like 

 those of the adult ; and the breast ailB belly thickly mixed with the 



