30 



SOUTH AMERICAN BIRDS. 



primaries averaging intermediate ; 

 length about 2G.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. 



vegae (Palm^n). Pallas's Gull. 

 Mantle delicate pearl-gray, dec'idedly 

 paler than in L. vegee ; eyelids (in 

 life) yellow, and feet pale flesh-color. 

 Young : Brownish gray, nearly uni- 

 form on lower parts, the head and 

 Deck 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- 

 late ; head marked with irregular 

 spots of black ; back, wings, anil rump 

 clouded with dusky graj'ish. 

 A". White near end of outer quill usu- 

 allj' extending to extreme tip, 

 without interruption by a sub- 

 terminal black bar ; the latter, if 

 present at all, usually verj' 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. Jfiih. Europe, etc.; 

 casual in eastern North America? 

 51. L. argentatus But'NN. 

 Herring Gull. 

 A''. White near end of outer (luill always 

 separated from the white tip by 

 a distinct subterminal bar or 

 spot of black, this rarely less 



