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BULLETIN 202, U. S. DEPARTMENT OP AGRICULTURE. 



eggs have been reported. It breeds south to the lakes on the upper 

 Pelly River in Yukon (Pike) and to Atlin in northern British Colum- 

 bia (Anderson) ; these five places seem to be the only sure records of 

 actual nesting. Although the species has been reported as nesting 

 at various places south to southern British Columbia, Alberta, Mani- 

 toba, southern Keewatin, and even to North Dakota, Minnesota, 

 Wisconsin, and Michigan, it is very suggestive that it is not known 



Fig. 2S. — Bonaparte's gull (Larus Philadelphia). 



to nest on any of the large lakes in southern Mackenzie, where it 

 would certainly breed if it did at these much more southern locali- 

 ties. The probabilities arc that Bonaparte's gull is an arctic- and sub- 

 arctic-breeding bird which finds its most congenial home on the Arctic 

 lakes and rivers at the farthest north it can find the evergreens on 

 which it places its nest. 



Daring summer, nonbreeding individuals of the species occur com- 

 monly on the coast of southeastern Alaska (Swarth) and not rarely 



