37 



B. Not plain brown above. 



a. Forehead same color as crown. 

 Green above ; white beneath, 



White-bellied Swallow. 

 No green or white, Purple Martin. 



aa. Forehead not same color as crown. 



Tail deeply forked, Barn Swallow. 



Tail almost square cut, Eave Swallow. 



3. Bill not as above, but with tips of mandibles crossed. 



Two white bars on wing, White- winged Crossbill. 

 No bars on wings. Red Crossbill. 



4. Bill not as above, but with a distinct sharp lobe or tooth 



near middle of edge of upper mandible. 



Scarlet Tanager. 



5. Bill not as above, but much shorter than head and with 



corners of month sharply drawn down. 



A. Tail feathers sharply pointed ; length over 6^ inches. 



Bobolink. 



B. Tail feathers not sharply pointed if bird is over 6 



inches, 

 a. Bill black, 

 b. Crown rufous, reddish or yellowish. 



Length over 8 inches. Pine Grosbeak. 



Length under 6 inches. Chipping Sparrow. 



bb. Crown not rufous, reddish or yellowish. 



Belly white ; sides chestnut, Chewink. 



No white or chestnut, Cowbird. 



aa. Bill not wholly black, 

 b. Length over 7 inches, 

 c. Bill very large and light-colored. 



Breast rose-red ; or else under wing coverts saf- 

 fron-yellow, Eose-breasted Grosbeak. 

 Breast not rose-red ; under wing coverts not 

 saffron-yellow, Evening Grosbeak. 



