FAM. VII. WOOD WARBLERS 75 



M. Two white wing bars ; ^ entire upper parts sky-blue {male) or dull 

 greenish, brightest on the head (female'), under parts white (tinged 



with pale yellow in the female) 18. Cerulean Warbler. 



M. Slightly yellowish-white wing bars ; sides with some chestnut mark- 

 ings 19. Chestnut-sided Warbler. 



M. No wing bars but a white blotch on the primaries near the base 

 (very small in female and young) ; upper parts grayish-blue (male) 



or olive-green (female) 14. Black-throated Blue Warbler. 



N. Crown with two black stripes separated by a broader one of buff ; 

 two other black stripes back of the eyes ; under parts buffy, un- 

 spotted 4. Worm-eating Warbler. 



N. Head brown, a whitish line over eye ; under parts white, grayer on 



sides and not definitely spotted 3. Swainson's Warbler. 



N. Not as above, and the tail f inch or more shorter than the wing. (P.) 

 N. Tail not over J inch shorter than the wing. (0.) 



0. Upper parts somewhat ashy with more or less of an orange-brown 

 patch on the crown (except in the young) ; under parts dull, some- 

 times with dusky streaks on the breast ; a yellowish or white ring 



around the eye 9. Orange-crowned Warbler. 



0. A small white patch on the base of the primaries, near and partly 

 hidden by the coverts ; upper parts olive-green, with a brownish 



tinge on the tail 14. Black-throated Blue Warbler. 



P. Upper parts yellowish-olive; under parts dull white more or less 

 tinged with yellowish but without definite spots ; a whitish line over 



the eye and white under tail coverts 10. Tennessee Warbler. 



P. Conspicuously spotted or streaked below, thrush-like; back brown, 

 brownish-olive, or dusky ; head striped, at least a distinct line over 

 the eye. (Q.) 



Q. Crown with an orange-brown stripe bordered with black lines 



29. Oven-bird. 



Q. No central stripe on crown, but a whitish to buffy line over the eye ; 

 under parts, including the throat, tinged with yellow and very fully 



streaked with black 30. Water Thrush. 



Q. Line over the eye conspicuously white ; under parts slightly buffy 

 tinted, and the black streaks do not extend over the throat or mid- 

 dle of the belly 31. Louisiana Water Thrush. 



R. Without bright yellow, but with more or less of flame color or dull 



yellow on wings and tail 40. American Redstart. 



R. Breast bright yellow. (S.) 



S. Under tail feathers with white blotches 37. Hooded Warbler. 



S. Under tail feathers without white blotches on the inner webs ; no 

 wing bars. (T.) 

 T. Above bright olive-green ; crown black without streaks (black cap 



sometimes lacking in female and young) 38. Wilson's Warbler. 



T. Above bluish-ash ; a necklace of black (male) or dusky (female) 

 spots across breast 39. Canadian Warbler. 



