266 



KEY TO THE BIRDS OF 1. ASTERN NORTH AMERICA. 





Tree Swallow. 



Entire underpants, white ; upper plumage, metallic steel blue; \ ouug bird< 

 have the upper plumage brownish gray, but the uuder plumage is pure white. 



White-bellied Swallow. 

 Tree Swallow. 

 Tachycineta bicoJur. 

 See No. 462. 



Upper throat and sides of the head, chestnut 

 brown; belly, whitish; forehead, whitish; 

 crown anil hack, dark Meel blue; upper tail 

 coverts, pale rufous brown. 



Cliff Swallow. 

 Petrochdidon lutiifmn*. 

 See No. 458. 



Throat, chestnut; belly, pale brown; entire 

 upper plumage, steel blue; tail, forked ; upper 

 -. tail coverts, steel blue. 



Barn Swallow. 



Cheliilnn rrythmrinstra, 

 See page 401. 



