BIRDS OF ONTARIO. (i 
An occasional winter visitor to the great lakes. 
10. Parasitic Jaeger. 
(Stercorarius parasiticus.) 
An oceasional spring and autumn visitor to the great lakes. 
Famity LARIDA. 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.) 
