FAMILY HIRUNDINIDiE. SWALLOWS. 



207 



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 iuto dull 

 white on the belly. Iram:itui-e birds have the upper pluman-c, brownish ; under- 

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



Purple Martin. 

 Froffne subis. 

 See No. 456. 



Back, steel blue; belly, white. 



Tree Swallow. 

 White=bellied Swallow. 



Tachycineta bicolor. 

 See J^'o. 462. 



