NORTH AMERICAN GULLS AND THEIR ALLIES. 



43 



RING-BILLED GULL. Larus delawarensis Ord. 



Range. — North America from British Columbia, southern Macken- 

 zie, and central Quebec south to Florida and southern Mexico. 



Breeding range. — The ring-billed gull occupies in summer a rather 

 narrow belt stretching across North America with its northern side 

 beginning at Hamilton Inlet, Quebec (Macoun), and extending to 

 Fort George, on James Bay (eggs in U. S. National Museum) ; a little 

 north of Fort Churchill, Keewatin (Preble); and Great Slave Lake, 



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Fig. 22. — Ring-billed gull {Larus delawarensis). 



Mackenzie (Kennicott). The distribution on the Pacific slope is not 

 so far northward. The species is known to breed on Malheur Lake 

 and Lower Klamath Lake, in southern Oregon (Finley), and at Buffalo 

 Lake, near Red Deer, Alberta (Dippie). It was common at Shu- 

 swap Lake, British Columbia, in June, 1889 (Macoun). It breeds 

 south to Cape Whittle, in the Gulf of St. Lawrence (Frazar); the 

 islands in Georgian Bay (Fleming) ; formerly on the islands in Green 

 Bay, Wis., and in 1860 at Lake Koshkonong (Kumlien and Hollister); 

 in 1892 on Gull Island, near Vans Harbor, Mich. (Van Winkle) ; Heron 



