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KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 



Qroup 2. Wing, 2.37 to 2.75 inches long. 



First primary, very short; lores and eye ring, whitish; throat, whitish: 

 breast and sides, faintly tinged with yellow ; no wing bars. 



Warbling Vireo. 



Vireo gilvus. 

 See No. 473. 



First primary, short, but longer than in V. 

 gilvus ; lores and eye ring, yellow ; back, 

 olive ; wing coverts, edged with white. 



White=eyed Vireo. 



Vireo noveboracensis, and races. 

 See No. 478. 



First primary, not short ; lores and eye ring, dull white ; underparts, washed 

 with very pale greenish yellow; no wing bars. 



Philadelphia Vireo. 



Vireo philadelphicus. 

 See No. 472. 



