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FAMILY HIRUNDINIDZ. —SWALLOWS. 
Group 2. Wing, 4.75 to 5.50 inches long. 
Male: Generai plumage (including belly), bluish black, or dark steel blue, 
I'emale: Back, like male; underparts, grayish brown, shading into dull 
white on the belly. Immature birds have the upper plumage, brownish; under- 
parts, 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. 
