BIRDS OF ONTARIO. 



An occasional winter visitor to the great lakes. 



0. Parasitic Jaeger. 



(Stercorarius parasiticus.) 

 An occasional spring and autumn visitor to the firreat lakes. 



Family LARID^. Gulls and Terns. 



Genus PAGOPHILA. 



11. Ivory Gull. 



(Pagophila alba ) 

 A regular but not common winter visitor to the great lakes. 



Genus RISSA. 



12. Kittiwake 



(Rissa tridactyla.) 

 A regular but not common winter visitor to the great lakes. 



Genus LaRUS. 

 13 Glaucous Gull 



(Larus glaucus.) 

 A regular but not common winter visitor to the great lakes. 



14. Great Black-backed Gull. 



(Larus marinus.) 



A regular but not abundant winter visitor to the great lakes ; 

 more frequently observed than either of the preceding species. 



15. American Herring Gull. 



(Larus argentatus smithsonianus.) 



A very common resident, frequenting the great lakes at all sea- 

 sons, but most abundant in winter. 



16 Ring-billed Gull. 



(Larus delawarensis.) 



A common resident ; like the last, most abundant in winter. 



*17. Laughing Gull. 

 (Larus atricilla) 

 An accidental visitor in summer. 



18. Franklin's Gull. 



(Larus franklinii.) 



