330 



KEY A^'B DESCRIPTION 



with pearl-gray, but there is a darker spot around the eye. 

 The young has the back of the neck and lesser wing coverts 

 black. The name is derived from the bird's cry, kitti-aa, kitti-aa. 



Length, 17; wing, 12i; tail, A\; tarsus, 1^; culmen, 1^. Arctic re- 

 gions, south in eastern America, in winter to the Great Lakes and the 

 Middle States. 



15. Glaucous Gull (42. L()n(s glaucus). — A very large, north- 

 ern, iiparly white gulL with yellow bill, a light pearl- 

 gray mantle, and 

 white tips ; no black 

 anywhere in any 

 lihiinage. Young 

 much mottled ashy 

 ;iii(l buffy. (Burgo- 

 master.) 



Length, 30 ; wing, 18 

 (l(U-18f) ; tail, 8 ; tar- 

 sus, 2J ; culmen, 21. 

 .Xrctic regions ; breed- 

 inn in America from 

 Labrador northward, 



Glaucou^i Gull 

 and south in winter to the Great Lakes and Long Island 



16. Iceland Gull (43. Ldnis leucdpterus). — A large, north- 

 ern, almost white gull, much like the last in coloring, but in its 

 movements and feeding more like the herring gull (Xo. 19). 

 The mantle is pale pearl-gray, and there are no dark tips to 

 the primaries. 



Length, 25; wing, \b\ (14|-16^) ; tail, 6J ; tai-sus, 2\; culmen, 1|. 

 Arctic regions ; south in winter to the Great Lakes and Long Island, 

 sometimes still farther. 



17. Kumlien's Gull (45. L(irus kumDeni). — Similar to the 

 last two, but witli the primaries distinctly marked with ashy- 

 gray. The first primary has a white tip with ashy-gray outer 

 web ; the second, with only a part of the outer web ashy-gray ; 

 the third and fourth have little gray on the outer webs, but 

 some on both webs near the tips. 



