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KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 



FAMILY TROQLODYTID^E. 



Wrens and Thrashers. 



First primary, less than two thirds as long as third ; outer tail 

 feathers, decidedly shorter than middle ones, varying from one eighth 

 to one half inch or more shorter in different species. 



Group 1. Wing, less than 3.25 inches long. 



SUBFAMILY TROGLODYTIN/E. 

 Wrens. 



Small, brownish, plain colored birds. 



Part 1. The following species have the crown or back without white 

 streaks or dots : 



Thryotliorus bewickii. 



Outer tail feathers, tipped and marked 

 with grayish white; primaries, not 

 barred. Bewick's Wren. 



Thryothorns bewickii. 

 See No. 538. 



Underparts, grayish ; belly, grayish, not 

 speckled; outer tail feathers, not broadly 

 tipped with grayish white; tail, over 1.25 

 inches long ; primaries, showing narrow bars. 



House Wren. 



Troglodytes aedon, and races. 

 See No. 539, 



