NORTH AMERICAN BIRDS. 
primaries averaging intermediate ; 
length about 26.00, wing 15.15-18.30, 
culmen 1.90-2.20, depth of bill 
through angle .60-.80, tarsus 2.15- 
2.20, middle toe (without claw) 1.60- 
2.15. Hab. Southern Europe and 
central Asia, from the Mediterranean 
to Bering’s, China, and Japan Seas, ~~ 
and down the North American coast 
to California, in winter......... 52. L. 
vegze (PaALMiN). Pallas’s Gull. 
#, Mantle delicate pearl-gray, decidedly 
paler than in Z. vege; eyelids (in 
life) yellow, and feet pale flesh-color. 
Young: Brownish gray, nearly uni- 
form on lower parts, the head and 
neck streaked, and the upper parts 
irregularly varied with pale grayish 
buff or dull whitish; quills, their 
coverts, and tail-feathers, dusky 
blackish ; bill blackish, paler basally. 
Downy young: Grayish white, the 
lower parts (except throat) immacu- 
tate; head marked with irregular 
spots of black ; back, wings, and rump 
clouded with dusky grayish. 
i}, White near end of outer quill usu- 
ally extending to extreme tip, 
without interruption by a sub- 
terminal black bar ; the latter, if 
present at all, usually very small 
and rarely continuous; length 
about 23.00, wing 15.75-17.90 
(16.38), culmen 1.85-2.20 (2.07), 
depth of bill through angle .72- 
.80 (.77), tarsus 2.30-2.72 (2.50), 
middle toe 1.90-2.25 (2.07). Eggs 
2.91 X 1.98. Hab. Europe, etc.; 
casual in eastern North America? 
51. L. argentatus Bruin. 
Herring Gull. 
*, White near end of outer quill always 
separated from the white tip by 
a distinct subterminal bar or 
spot of black, this rarely less 
