FAMILY HIRUNDINID^E. SWALLOWS. 



2(57 



Group 2. Wing, 4.75 to 5.50 inches long. 



Male: General plumage (^including belly), bluish black, or dark steel blue. 

 Female: Back, like male; underparts, grayish brown, shading into dull 

 white on the belly. Immature birds have the upper plumage, brownish ; under- 

 parta, brownish on the breast ; dull white on the belly. 



Purple Martin. 

 Progne subis. 

 See No. 456. 



Back, steel blue; belly, white. 



Tree Swallow. 

 White-bellied Swallow. 



Tachycineta bicolor. 

 See No. 462. 



