GULLS. 



G9 



feathers, and sometimes the wing-coverts, with a black spot at their tips. L., 

 17-00 ; "VV., 13-26 ; T., 5-50 ; B., 1-35. 



Range. — "Arctic seas, south in winter on the Atlantic coast of North 

 America to Labrador and Newfoundland, casually to New Brunswick, and on 

 the Pacific side to Bering Sea " (A. 0. U.). 



Long Island, A. V., one record. 



Nest, of grass, moss, and feathers on rocky cliff's. Eygs, light yellowish 

 olive, marked with small blotches of brown and larger cloudings of lilac, 

 2-45 X 1-70 (Brewer). 



" The Ivory Gulls appear to spend most of the time amid the paok- 

 ice, often at a long distance from land" (Chamberlain). 



?:^r7^>^;^'^- -'^ -"^ 



Fig 60 -First primaries of adult Giills, seen from below: (a)^ Am. Herring 

 Gull ; (6) Eing-biUed Gull ; (c) Laughing Gull -, (d) Franklm's Gull ; (e) Bona- 

 parte's Gull. 



40. Rissa tridactyla (Linn.). Ktttiwake. Ad. in summer.— Head, 

 neck, tail, and under parts pure white; back and wings pearl-gray; outer 

 •web of first primary and 3-00 of the ends of first and second primaries black; 



