DESCRIPTION. 139 



7. Dovekie. 



Length about 8 inches. Upper parts black, 

 wing feathers tipped with white. Lower parts 

 white. 



8. Kittiwake. 



Length about 17 inches. Bill 1J inches long. 

 Upper parts white, mantle pearl-gray, wing fea- 

 thers black tipped with white. Lower parts white. 

 No hind toe. Young : With lower part of hind-neck 

 crossed by a black patch, tail tipped with black 

 band. 



9. Glaucous Gull. 



Length about 29 inches. Bill about 2J inches 

 long. Tail about 8 inches long. Upper parts 

 white, mantle grayish. Lower parts white. Young : 

 Upper parts mottled with brownish-gray, lower 

 parts grayish-white. 



10. Great Blavk-backed Gull. 



Length about 30 inches. Bill about 2J inches 

 long. Upper parts white, with dark slate mantle, 

 primaries mostly black tipped with white. Lower 

 parts pure white. Young . Dusky above, and lower 

 parts grayish-brown. 



11. American Herring Gull. 



Length about 24 inches. Bill about 2J inches 



