b. Middle toe and claw considerably shorter than tarsus.
Bill very acute, its outlines nearly straight; notch not perceptible; bristles not apparent … Helminthophaga.
Bill very acute, its outlines nearly straight; notch just perceptible; bristles strong … Parula.
Sylvicoleæ. Bill distinctly notched; rictal bristles strong; outlines generally slightly curved.
Bill acute, gonys slightly concave … Perissoglossa.
Bill not acute, gonys convex … Dendroica.
GEOTHLYPINÆ.
3. Wings pointed, longer than the nearly even tail.
Seiureæ.
Above olive-brown; beneath white with dark streaks … Seiurus.