1. SULA. 



435 



their coverts, which ai'e brownish black, the secondaries and their 

 coverts as well as the longer scapulars, which are dark brown except 

 towards tlie base, and the outer tail-feathers, which are dark brown, 

 the middle pairs inclining to whitish on the basal half. Tail com- 

 posed of 16 feathers. Bill in dry skin red, paler towards the tips 

 of the mandihles ; naked skin round eye and on throat blackish ; 

 tarsi and feet yellowish brown. Total length about 29 inches, 

 culmen from feathers on forehead 4-15, wing 17'3, tail G-5, tarsus 2. 



Immature in first plumagi'. Head, neck, and under tail-coverts pale 

 sooty-grey, the feathers on the front of the forehead white ; nape, 

 rest of upper parts, and tlanks dark brown, the scapulars and wing- 

 coverts shading into whitish at the extremity ; under wing-coverts 

 like the back ; axillaries, chest, and rest of underparts white. Most 

 of the feathers of the breast with greyish-brown middles, producing 

 a slightly mottled appearance. 



Immature (? plumage of the second year). Head, neck, entire 

 underparts, and scapulars pure white ; back, wings, scapulars, sides 

 of the chest, flanks, and under wing-coverts brown, each feather 

 tipped or fringed with white, widest and most consjiicuous on the 

 scapulars. Iris light brown ; base of bill, gular pouch, legs and feet 

 light purple. 



Ill a ivarly adult bird (? in plumage of the third year) almost the 

 whole of the upper and lower back and many of the lesser and median 

 wing-coverts are pure white as in the adult. Total length about 

 29 inches, culmen from feathers on forehead 3"9. 



Hab. Coasts of Chili and Peru. 



a. Ad. sk. 



b. Imm. sk. 



c. Imm. sk. 



d. Vix ad. sk. 



e. Juv. sk. 



/. Nr. ad. sk. 



y. (S imm. sk. 

 h, i. S imm. sk. 



k. Imm. sk. 

 I. Skeleton. 



West coast of America. 



West coast of S. America. 



Coast of Peru. 



Callao Bay, Peru, Aug. 

 {Admiral A. H. Mark- 

 ham). 



San Lorenzo I., Peru {A. 

 H. M.). 



Chorillos, Peru. 



Coast of Chili {E. C. Reed). 

 Coquimbo, May {Dr. Cop- 



jiimjer). 

 Valpariaso. 

 Chili. 



7. Sula nebouxi. 



Capt. Kellett & Lieut. 



Wood, P.N. [P.]. 

 Sir E. Belcher [P.]. 

 Rev. W. Hennah[P.]. 

 Salvin-Godman Coll. 



Salvin-Godman Coll. 



Howard Saunders, 



Esq. [P.]. 

 Salvin-Godman Coll. 

 Voyage of H.M.S. 



' Alert.' 

 Capt. Brett [P.]. 



Sula nebou.xii, Milne-Edwards, Ann. Sci. Nat. (6) xiii. art. 4, p. .37, 



pi. 14 (1882) [Pacific coast of America] ; Ridgw. Man. N. Am. B. 



2nded. p. 584 (1896). 

 Sula arossi, {Ridgw. MS.), Goss, Auk, v. p. 241 (1888) [San Pedro 



Martirl.]; R^ichen. Sc Schal. J. f. 0. 1883, p. 400; Ridgw. R U.S. 



Xat. Mas. xii. p. 114 (1889);' Shufeldt, Auk, vi. p. 07, riS89) ; 



A. O. U. Check-!, p. 40 (1895) ; Brewst. etc. Auk, xiv. p. 1 24\l897). 



Adult. Head, upper part of neck, and sides of lower neck smoky • 



2f2 



