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 MNIOTILTIDiE: WOOD WARBLERS. 
KEY TO GENERA. 
1. Gape with conspicuous bristles. 
2. Under parts mainly clear yellow. Wilsonia, p. 427. 
2'. Under parts marked with red, orange, or yellow (except 
young Cardellina). 
Fig. 493. 
3. Bill broad and much flattened at base . . Setophaga, p. 429. 
3'. Bill narrow and deep at base, 
adults, brown in young 
1'. Gape without conspicuous bristles. 
Face and throat red in 
. Cardellina, p. 430. 
Fig. 494. 
Fig. 495. 
2, Tarsus about equal to middle toe and claw; 
upper parts conspicuously streaked with 
black and white . . Mniotilta, p. 402. 
Fig. 496. 
2\ Tarsus longer than middle toe with claw; 
upper parts not distinctly streaked with 
black and white. 
3. Bill deep, and strongly curved . . Icteria, p. 426. 
3'. Bill not deep, nor strongly curved. 
Fig. 498. 4. Bill narrowly wedge-shaped. 
Fig. 497. 
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 . Helminthophila, p. 402. 
4'. Bill slenderly conical. 
5. Tail marked with white or yellow. 600- 
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. 
6'. Tarsus decidedly more than one third as long 
as wing; under parts not streaked ; partly 
yellow. Geothlypis, p. 424. 
