xlvi 



FIELD COLOE KEY 



T. Top of head same color as back. 

 8. Head and back bluish slate ; breast pinkish. 

 Outer tail feathers, only, showing grayish white 

 in flight . . . . p. 78. PASSENGER PIGEON. 



8'. Head and back brownish ; under parts whitish. 

 9. Lower half of bill yellow ; outer tail feathers 

 black, broadly tipped with 

 white ; wings largely ru- 

 fous ; ring around eye yellow. 



p. 160. YELLOW-BILLED CUCKOO. 



9'. Lower half of bill black ; outer tail feathers 

 brown, very narrowly =-, 

 tipped with white ; wings 

 without rufous ; ring 

 around eye red. p. 163. BLACK-BILLED CUCKOO. 



2'. No white patches on wings, tail, or 



rump. 



10. Form slender ; tail long ; upper 

 parts rich reddish brown ; under 

 parts white, heavily streaked 

 with black. Song long and 

 varied p. 177. BROWN THRASHER. 



10'. Form stout, hen-like ; tail not long ; body covered 

 with markings. 



11. Neck with conspicuous black 

 ruff ; end of tail barred, 

 p. 32. RUFFED GROUSE. 



11'. Neck with- 

 out ruff ; 

 end of tail 

 not barred. 



p. 37. BOB-WHITE ; QUAIL. 

 RUFFED GROUSE. 



