Descriptions of two New Species of Gulls. 265 



mandible beyond the nostrils, and the angle of the lower 

 mandible, which are orange yellow ; both mandibles have their 

 tips pale yellow ; legs and feet greenish yellow. 



Length 1 71 inches ; alar extent 43£ ; wing 13* ; tail 5\ ; bill 

 lfV ; tarsi If. 



Habitat. — North Pacific, Puget Sound. 



The adult, in winter, has the head and neck mottled with 

 dark ash. 



One specimen, not quite mature, has the wing-coverts edged 

 with brownish ash, and the remnant of a subterminal black 

 band upon the tail ; bill blackish brown. 



Two specimens which I think are the young of this species, 

 have the head, neck, and under surface greyish white, mottled 

 with light ash, darker on the breast; upper and under tail 

 coverts barred with brownish ash ; upper plumage dark ash 

 mottled with grey, the pearl blue color of the back just begin- 

 ning to appear ; wing-coverts, secondaries, and tertiaries brownish 

 ash, margined with dull white ; primaries dark brown, the 

 inner ones light cinereous on the inner webs, tips edged with 

 dull white ; tail dark brown, ashy white at the base and nar- 

 rowly tipped with the same color ; bill flesh color at the base 

 for about half its length, remainder black; iris hazel; tarsi 

 and feet flesh color. 



One measures in length 171 inches; wing 13|; tail 5{ ; bill 

 li, depth at angle 1 ; tarsus 11, middle toe and claw 1*. The 

 other specimen is rather smaller. 



I have conferred upon this species the name of Dr. Geo. 

 Suckley, whose interest in science is fully attested by the 

 numerous specimens collected by him, and now in the Museum 

 of the Smithsonian Institution. 



It is allied to L. zonorhynchus, but the mantle is darker ; 

 the bill shorter and more slender than in that species, being 

 only about two thirds as large. 



