ioo A FIELD GUIDE IN NATURE-STUDY 



OOOO Red on throat, bird tiny Ruby-throated Humming Bird 



OOOOO Red on crown, only showing when crown 



feathers are erected Ruby-crowned Kinglet 



A-9. Birds conspicuously marked with yellow 

 E Head aU yellow 



I Most of bird black Yellow-headed Blackbird 



II Most of bird yellow, possibly greenish yellow 



O Under parts streaked Yellow Warbler 



OO Under parts not streaked Prothonotary Warbler 



EE Head not all yellow 

 I Under parts yellow 



O Under parts unmarked with streaks or 

 blotches 

 X Whole head dark 



Y Head and back black; the yellow, 



orange-yellow Baltimore Oriole 



YY Head slate-colored 



a White eye ring Connecticut Warbler 



aa No eye ring, throat black Mourning Warbler 



XX Head not wholly dark 



Y Head marked with black 



a Throat black also Hooded Warbler 



aa Throat not black 



o Wings and tail black, marked 

 with white 

 x Crown black, no yellow 



over eye American Goldfinch 



xx Crown yellow, yellow line 



over eye Blackburnian Warbler, female 



oo Neither wings nor tail black 

 x Crown black 



y Crown only black spot Wilson's Warbler 

 yy Other black besides 

 crown 



z Black line down 

 side of neck; yel- 

 low line over eye Kentucky Warbler 

 zz No black on neck; 

 white line over eye 



Yellow-breasted Chat 

 xx Crown not black, cheeks 



black Maryland Yellowthroat 



YY Head not marked with black 

 a With two wing bars 



o Green-yellow patch middle 



of back Parula Warbler, female 



