46 CATALOGUE OF 



17. Ivory Gull. (Gavia alba.} 



Not uncommon, but certainly does not breed within tbc 

 settled parts of the country. 



18. Kittiwake. (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. Glaucous Gull. (Larus glaucm.) 



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 Gull. (Larus leucopterm.) 



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. 



