222 Field Museum of Natural History — Zoology, Vol. IX. 



Family HIRUNDINID.^:. Swallows. 



Bill, small and flattened, somewhat triangular in shape; gape, very 

 wide ; wings, long, usually extending beyond the tail. 



* GROUP 1. Wing, 3.25 to 4.75 inches long. 



At 



Bank Swallow. 



Throat and belly, white; a distinct band of grayish brown on the 

 ■breast; upper plumage, brownish gray. Riparia riparia. 



Bank Swallow. 

 See No. 287. 





Under parts, brownish gray, gradually 



shading into whitish on the belly; upper 



parts, grayish brown; no distinct breast 



band. Stelgidopteryx serripennis. 



Rough-winged Swallow. 



See No. 288. 



* For directions for measurement, see page 21. 



