CHECK LIST OF NEW YORK BIRDS 205 



17 (40) Kittiwake 



Rissa tridactyla (Linn.) 



18 (42) Glaucous gull 



Larus glaucus Briinn. 



19 (43) Iceland gull 



Larus leucopterus Faber 



20 (47) Great black-backed gull 

 Larus marinus Linn. 



