205 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 Micropodidze and are widely sepa- 
rated generically from the swallows; but 
persons unfamiliar with birds might look 
for them under the same family. 
Chimney Swift. 
Chetura pelagica. 
See No. 340. 
