222 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. IX. 



Family HIRUNDINID^E. 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. 



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. 



