xxxvill FIELD COLOE KEY 



25'. Crown patch yellow ; sides 

 chestnut. Back streaked with 

 black ; throat white. 



p. 318. CHESTNUT-SIDED WARBLER. 



D. BLACK OR BLACK AND WHITE CON- 

 SPICUOUS IN PLUMAGE. 

 1. MAINLY OR WHOLLY BLACK OR BLACK- 

 ISH. 



2. Wholly black or blackish. 

 3. Head and neck naked. 



4. Skin of head and neck red. Tips 

 of wing feathers conspicuously 

 separated in flight. 



p. 263. TURKEY VULTURE. 



4'. Skin of head and neck black. 



p. 265. BLACK VULTURE. 



3'. Head and neck not naked. 



5. Large ; plumage always black, pp. 11, 16. CROWS. 



5'. Small ; plumage rusty in fall. 



p. 101. RUSTY BLACKBIRD. 



2'. Not wholly black or blackish. 

 6. Head and neck brown or purplish. 



7. Head and neck brown . . . . p. 98. COWBIRD. 



7'. Head and neck purplish. 



p. 93. CROW BLACKBIRDS. 

 6'. Head and neck not brown or purplish. 



8. Red patches on shoulders. 



p. 96. RED-WINGED BLACKBIRD. 



8'. No red patches on shoulders. 

 9. Back marked with white. 

 10. Under parts and top of head wholly 

 black ; back of neck with cream- 

 buff patch ; back largely whitish. 



p. 103. BOBOLINK. 



