KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 



Back, steel blue; underparts, cinnamon brown; tail, very deeply forked. 



Barn Swallow. 



Chelidon erythrogastra. 

 See No. 461. 



General plumage, sooty brown ; showing 

 a faint greenish tinge on the upper parts ; 

 throat, ashy white; tail feathers, with 

 sharp spines, or points formed by the 

 shafts of the feathers, extending beyond 

 the webs. The swifts belong to the 

 Family Micropodidse and are widely sepa- 

 rated generically from the swallows ; but 

 persons unfamiliar with birds might look 

 for them under the same family. 



Chimney Swift, 



Chcetura pelagica. 



See No. 340. 



