B. Lateral toes equal.
c. Length about 8 inches. Campylorhynchus.
d. Length less than 6 inches.
Bill abruptly decurved or hooked at the tip. Outstretched feet not reaching near to end of tail. Thryothorus.
Tail longer than the wing, the feathers black, variegated terminally with whitish … Subgenus Thryomanes.
Tail shorter than the wing, the feathers rusty, not variegated with whitish … Subgenus Thryothorus.
Bill only gently curved at the tip. Outstretched feet reaching nearly to or beyond the end of the tail.
Back without streaks. No distinct superciliary stripe. Troglodytes.
Bill curved, sub-conical. Tail as long as wing … Subgenus Troglodytes.
Bill straight, subulate. Tail much shorter than wing … Subgenus Anorthura.