1. stJLA. 43y 



pt ii. p. 140 (1868) ; Swinh. Ibis, 1873, p. 231 [Hainan] ; Salvad 

 Ucc. Borneo, p. 308 (1874); Hnme, Str. F. v. p. 312 ri877) ■ 

 Hartl. Vog. Madagasc. p. 397 (1877) ; Nicholson, Ibis, 1882 p 70 

 [Cocoa, Keeling K]; Sharpe, P. Z. S. 1887, p. 51(5 [Christina.; I., 

 Indian Ocean]; Eoerett, J. Str. B. As. 8oc. xx. p 187 (1889) 



^n ''T^l^n'^n^''"'*^.^'- i""''- P- ^l-"^ C1^90) ; Wii/lesxo. Abh. Mm. 

 I)resd.im0-9l p 72 ; Lister, P. Z. S. 1891, pp. 294, 300 [Phoenix 

 Is.J ; Rothschild, Amf. Lmjsan, pt. i. p. 27 (1893) 



^^I'fo'^nf '^''^'^^'^^' ^«'^^«"*- inec Spiv) Natatores, pi. xxix. no. 85] 

 (18o0). 



Piscatrix Candida, Reichenb. Av. Si/st. Nat. p. vi (1852') • Bonao 



f%7^f';;."- P- ^^<^ Pf^^M •^'"'««' ^''^- ^"<=- Cherbourg, ix.' 

 p. 241 (18b3) [New Caledonia]. ^' 



Djsporus hernandezi, Gundl. J.f. O. 1878, p. 298 [Cuba]; 1881, 

 Sula corji, Maynard, Contr. Sci. i. pp. 40-48, pp. 51-57 nl v 



rfvn^'f' ?.P- ^^ni'^fiA f\^^^^^^ [Cayman Brae &'Little 

 Cayman] ; Cory, Cat. W. Ind. B. p. 84 (1892). 



Adult. General colour pure white ; primaries, primary-coverts 

 outer webs and tips of secondaries and secondary-coverts hoary o-rey' 

 inchning to blackish on the outermost quills in freshly-moulted Wrds' 

 and to blackish in worn specimens Chin and upper part of the 

 throat naked, the feathers ending in a straight line across the throat 

 1 ail composed of 14, or sometimes 16 feathers. Iris grey bill 

 greyish blue, shading into pink or reddish towards the base • naked 

 skin round eye blue ; gular pouch dark slate or black ; legs and feet 

 vermilion, red or dark pink, almost magenta. 



Adult male. Total length about S9'5 inches, culmen from feather* 

 on forehead 3-5, wing 15-5, tail 8-3-9-0, tarsus 1-4. 



Adult female. Total length a])out 28 inches, culmen from 



leathers on forehead 3-2-3-45, wing 14-7-14-8,tail8-2-8-3, tarsus 1-4 

 Immature in first i^lumage. Entire plumage above and below 

 brown, lighter on the breast and belly ; primaries and secondaries 

 and their coverts like those of the adult, but the inner webs of 

 the secondaries black. Cutting-edges of the mandible sometimes 

 serrated, and the inner margin of the middle claw pectinate. Bill 

 bluish pink, the latter predominating towards the base ; naked skin 

 round eye dark leaden hue ; gular pouch flesh-coloured. 



In more adult specimens (perhaps in the plumage of the second 

 year) the head, neck, and underparts are white ; the back, winces and 

 tail brown as in the immature ; and the middle tail-feathers da'k 

 brownish grey toward the base, shading into white toward the 

 extremity. 



A still more adult bird has a large amount of white or partially 

 white feathers mixed with the brown of the back and wings. 



I should imagine that the fully adult plumage is not" attained 

 until the third or ])erhaps the fourth year. This species may be 

 recognized in all stages of plumage by the hoary grey appearauce- 

 on the outer webs of the quills. 



Mab. Tropical and Sub-tropical seas throughout the world, except 

 the Pacific coast of America. 



VOL. XXVI. 2 p 



