628 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 
(in” life); iris grayish brown; legs and feet yellowish green or olive- 
yellowish. 
Adults in winter.—Similar to summer adults, but occiput, nape, and 
hindneck longitudinally spotted with grayish brown; ‘‘iris cream 
color with dark gray mottlings;’’* rictus orange-red;* naked orbital 
ring dusky red; legs and feet grayish olive-yellow, the joints darker, 
the webs purer yellow.* 
Young.—Head and neck dull whitish, striped with grayish brown; 
upper parts grayish brown, the feathers irregular but broadly mar- 
gined with dull whitish, grayish white, or pale dull buffy; greater 
wing-coverts and secondaries pale gray, margined with pale buff and 
with a sub-margin of dusky grayish brown; tertials grayish brown 
margined with buffy white; primary coverts and primaries dull black 
or dusky, very narrowly tipped with white; rump and upper tail- 
coverts white, irregularly spotted with dusky grayish brown; tail with 
proximal two-thirds (approximately) grayish white, fading into 
pure white basally, the distal third dusky grayish brown narrowly 
tipped with white, the grayish white of lateral rectrices finely mottled 
with dusky, especially toward base; under parts grayish white, the 
chest and sides thickly spotted or blotched with light grayish brown; 
bill blackish terminally, dull whitish or flesh color basally; iris dark 
brown; naked orbital ring brownish; legs and feet whitish or yellowish 
flesh color. 
Downy young.—‘‘Covered all over with a soft yellowish gray 
down, whiter in tint on the face, throat, and abdomen; forehead 
blackish brown; entire upper parts spotted here and there with 
large blackish spots, one or two spots being also on the throat, under 
parts generally unspotted, except that on the flanks there are some 
irregular black marks. It may be distinguished from the young 
of other Gulls by a large black spot which touches the base of the 
upper mandible, and which is never absent, though often varying 
in size.’’> 
Adult male.—Wing, 348-380 (364); tail, 185-150.5 (141.9); exposed 
culmen, 36.5-45 (39.5); tarsus, 45-56 (50.2); middle toe, 35-45 
(38.3).¢ 
Adult female—Wing, 339; tail, 139; exposed culmen, 38; tarsus, 
52; middle toe, 42.5.4 
@ Stejneger, Bull. U.S. Nat. Mus., No. 29, p. 76. 
b Dresser, Birds of Europe. 
¢ Fight specimens. 
@ One specimen (from Bering Island, Kamchatka). 
7 Ex- |- ‘ 
Locality. Wing. | Tail. | posed | Tarsus. Mile 
culmen. Pieces 
MALES. 
Six adult males from Europe... ......... 200. e cece cceceneeeeeee 364 | 139.9 38| 48.6 36.6 
Two adult males from Kamchatka (Petropaulski)............. 364 | 146.7 44 55 43.5 
