Vol. X"] Rhoads oh the Hudsom'an Chickadee and its Allies. 32 I 



1S93 J 



Cinclus. This zone reaches the limit of trees, beyond which, and 

 including the snow-capped summits, is the Arctic- Alpine zone 

 with Leucosticte as a representative bird. 



This group is a large one and includes among mammals the 

 jumping rats of the desert, ground squirrels of the mountains, and 

 the woodchuck and mountain sheep of the higher altitudes. 

 From a scientific standpoint it is doubtless the best single exhibit 

 in zoology shown at the Fair. 



It is quite probable that in this brief review more than one 

 collection of birds has been overlooked. Two hundred and nine 

 acres covered with exhibits proved as difficult 'collecting ground ' 

 as the mazes of a tropical forest, and afforded birds quite as 

 excellent opportunities for concealment. 



THE HUDSONIAN CHICKADEE AND ITS ALLIES, 

 WITH REMARKS ON THE GEOGRAPHIC DIS- 

 TRIBUTION OF BIRD RACES IN BOREAL 

 AMERICA. 



BY SAMUEL N. RHOADS. 



While examining the series of Pants lutdsonicus at the 

 Smithsonian Institution to determine the status of Parus hudson- 

 icus columbianus, Mr. Ridgway suggested to me the desira- 

 bility of a careful study of the affinities of the several members 

 of this group described by authors. A request for specimens 

 was made in my description of the British Columbian form of 

 hudsonicus in 'The Auk' for January, 1S93. No answers to 

 this appeal were received, and after a lapse of two months I 

 started a correspondence with several of the most prominent col- 

 lectors for the loan of skins. From five of these I received, in 

 all, twenty-five specimens, Mr. Brewster sending seventeen, 

 Prof. J. Macoun two, Mr. K. C. Mcllwraith four, Mr. A. G. 

 Kingston one, and the Natural History Society of Toronto one. 

 Several of my Canadian correspondents, from whom I had 



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