Sections and Genera.
SYLVICOLINÆ.
1. Middle toe, with claw, longer than tarsus.
Mniotilteæ. Bill much compressed for terminal half, the lateral outline decidedly concave; culmen and gonys decidedly convex; commissure moderately concave. Rictal bristles very inconspicuous; notch just perceptible … Mniotilta.
2. Middle toe, with claw, not longer than tarsus.
Vermivoreæ. Bill without a distinct notch, or lacking it entirely; rictal bristles wanting, or very minute; culmen and gonys nearly straight; bill only very moderately compressed.
a. Middle toe and claw about equal to tarsus.
Bill not acute; culmen and gonys decidedly convex; notch just perceptible; bristles apparent … Protonotaria.
Bill moderately acute, robust; no notch; culmen straight, its base elevated and slightly arched; bristles not apparent … Helinaia.
Bill moderately acute; robust; no notch; culmen convex, its base not elevated; bristles apparent … Helmitherus.