46 CATALOGUE OF 



17. Ivory G-ull. {Gavia alba.) 



Not uncommon, but certainly does not breed within tlie 

 settled parts of the country. 



18. Kittivrake. (Rissa tridactyla.) 



A summer resident, common all over Greenland, and 

 breeding in great numbers, especially in the southern divi- 

 sion. Eggs were taken on June 3 and June 18. 



19. Grlaucous Gull. {Larus glaucus.) 



Very common ; breeds in all suitable localities. Many 

 remain over winter, especially young birds. Eggs were 

 taken from May 10 to June 14. 



20. Iceland GruU. {Larus leucoptents.) 



Breeds everywhere in Greenland, but most abundantly in 

 the southern part, where it is extremely numerous. A few, 

 chiefly young birds, remain in South Greenland over winter. 

 Eggs laid from May 14 to June 10. 



[Note. — As Kumlien's Gull (^Larus kumlieni) has been 

 found breeding on Cumberland Bay, it doubtless occurs on 

 the western coast of Greenland. — M. C] 



21. Great Black-backed Gull. (Larus marinus.) 



A resident, common, especially along the shores of Central 

 Greenland. Eggs laid from May 3 to June 15. 



22. Siberian Gull. (Larus affinis.) 

 A chance visitor. 



