86 



CHECK-LIST OF NORTH AMERICAN BIRDS. 



[B 65s, C 542, R 699, C 767.] 



Hab. Northern part of Northern Hemisphere, breeding in high 

 northern districts ; south in winter to the Gulf of Mexico. 



Family LARID-ffi. Gulls and Terns. 

 Subfamily LARINuE. Gulls. 



Genus GAVIA Boie. 



Gavia Boie, Isis, 1822, 563. Type, Larus eburneus Phipps = La- 

 rus albus Gunn. 



39. Gavia alba (Gunn.). 



Ivory Gull. 



Larus albus Gunn. in Leem's Beskr. Finm. Lapp. 1767, 285. 

 Gavia alba Stejn. Pr. U. S. Nat. Mas. V. 1882, 39. 



[B 676, 677, C 550, R 657, C 785.] 



HaB. 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's Sea. 



Genus RISSA Stephens. 



Rissa "Leach," Steph. Gen. Zool. XIII. 1825, 180. Type, Larus 

 iridactylus Linn. 



40. Rissa tridactyla (Linn.). 



Kittiwake. 



Larus iridactylus Linn. S. N. ed. 10, I. 1758, 136. 

 Rissa tridactyla Bonap. Comp. List, 1838, 62. 



[B 672, C 552, R 658, C 782.J 



Hab. Arctic regions, south in Eastern North America in winter to 

 the Great Lakes and the Middle States. 



40 a. Rissa tridactyla pollicaris Ridgw. 



Pacific Kittiwake. 



Rissa tridactyla pollicaris " Stejn. MS." Ridgw. Water B. N. Am. 

 II. 1884, 202. 



