Artificial Key 17 



36. Throat and breast yellow, color clear or slightly clouded. 



Go to 37. 



Throat and breast yellow, but marked with brown or 

 black. Go to 43. 



37. Tail with white spots. Go to 38. 

 Tail without white spots. Go to 40. 



38. Upper parts black, conspicuously marked with white. 



Blackburnian Warbler, Male. (p. 74.) 

 Upper parts black-brown, conspicuously marked with 



white. Blackburnian Warbler, Female, (p. 74.) 

 Upper parts olivaceous. Go to 39. 



39. Nearly as large as a sparrow. Pine Warbler, Either 



Sex. (p. 73.) 



Only about two-thirds as large as a sparrow. Parula 

 Warbler, Female, (p. 79.) 



40. Cheeks and forehead black. Maryland Yellow- 



throat, Male. (p. 66.) 



Cheeks and forehead colored like the rest of the head. 

 Go to 41. 



41. Wing with two white bars. Yellow-throated Vireo, 



Either Sex. (p. 84.) 

 Wing without white bars. Go to 42. 



42. Head ashy; remaining upper parts olivaceous. Nash- 



ville Warbler, Either Sex. (p. 80.) 

 Head olivaceous, of much the same color as back. Mary- 

 land Yellow-throat, Female, (p. 66.) 



43. Breast bright yellow with black markings. Go to 44. 

 Breast bright yellow crossed by a broad brown band. 



Parula Warbler, Either Sex. (p. 79.) 



