WOOD WARBLERS 



401 



from six to twelve feet from the ground. The gray vireo's song 

 Mr. Henshaw considers the finest of all vireo songs, as it has not only 

 beauty and variety of note but mellowness of expression. 



FAMILY MNIOTILTIDJE : WOOD WARBLERS. 



KEY TO OENERA. 



1. Gape with conspicuous bristles. 



2. Under parts mainly clear yellow Wilsoilia, p. 427. 



2'. Under parts marked with red, orange, or yellow (except 

 young- Cardellina). 



3. Bill broad and much flattened at base 



o 

 i 



2 



Fig. 493. 



Setophaga, p. 429. 



3'. Bill narrow and deep at base. Face and throat red in 

 adults, brown in young- . . . Cardellina. p. 430. 



1 . Gape without conspicuous bristles. 



2. Tarsus about equal to middle toe and claw ; 

 upper parts conspicuously streaked with 

 black and white . . Mniotilta. p. 402. 



2'. Tarsus longer than middle toe with claw ; 

 upper parts not distinctly streaked with 

 black and white. 



Fig. 495. 



Fig. 496. 



Fig. 497. 



3. Bill deep, and strongly curved . . Icteria. p. 426. 



3'. Bill not deep, nor strongly curved. 

 4. Bill narrowly wedge-shaped. 



5. Rictal bristles obvious ; upper parts blue with 

 olive patch . . . Compsothlypis. p. 406. 



Fig. 499. 5'. Rictal bristles obsolete ; upper parts not blue 

 with olive patch . Helmiiithophila. p. 402. 



4'. Bill slenderly conical. 



5. Tail marked with white or yellow. Fig. 500. 



Dendroica, p. 407. 

 5'. Tail not marked with white or yellow. 



6. Tarsus less than one third as long as wing ; 

 under parts streaked . . Seiurus, p. 423. 

 t'> . Tarsus decidedly more than one third as long- 

 as wing ; under parts not streaked ; partly 

 yellow . . , . . Geothlypis. p. 424. 



