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KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 



Tree Swallow. 



Entire underparts, white ; upper plumage, metallic steel blue ; yoimg birds 

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



White-bellied Swallow. 

 Tree Swallow. 



Tachycineta bicolor. 

 See No. 462. 



Upper throat and sides of the head, chestnut 

 brown; belly, whitish; forehead, whitish; 

 crown and back, dark steel blue; upper tail 

 coverts, pale rufous brown. 



Cliff Swallow. 

 Petrochelidon lunifronx. 

 See No. 458. 



Throat, chestnut; belly, pale brown; entire 

 upper plumage, steel blue ; tail, forked ; upper 

 tail coverts, steel blue. 



Barn Swallow. 



Chelidon erythrogastra. 

 See page 461. 



