Family Vireonidce Warbling Vireo 85 



other vireos, does not restrict himself to morning 

 and evening hours, but may be heard even at noon- 

 day. He is the only vireo who sings on the wing; 

 and so in love is he with music that in the vicinity 

 of New York at least, he does not intermit his mel- 

 ody until early September, while even after this 

 time isolated songs may still be heard. 



LITERATURE: 



Nesting Habits of the Yellow-throated Vireo. Goss, "The Auk," 

 Vol. I. 



37. WARBLING VIREO ; WARBLING GREENLET 

 (Vireo gUvus.} 



Upper parts olive-green ; under parts grayish white with a tinge 

 of yellow ; a narrow white line above eye, which does not run 

 back behind it. Beak and feet dark. Bird distinctly smaller 

 than a sparrow. Sexes similar. 



THE warbling and red-eyed vireos are so similar 

 that it is almost impossible to distinguish them by 

 the eye when alive. The warbling vireo is, how- 

 ever, rather smaller than his brother, and is a far 

 more beautiful singer. He may be sought among 

 the higher branches of roadside trees, where he 

 would be easily overlooked were it not for his 

 music. He comes to us in early May, and leaves 

 again in early September. 



