KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 
FAMILY TROGLODYTID=. 
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 |. Wing, less than 3.25 inches long. 
SUBFAMILY TROGLODYTINAE. 
Wrens. 
Small, brownish, plain colored birds. 
Part |. 
The following species have the crown or back without white 
streaks or dots :— 
Outer tail feathers, tipped and marked 
with grayish white; primaries, not 
barred. Bewick’s Wren. 
Thryothorus bewichit. 
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 aédon, and races 
See No. 539, 
