Birds of America
By John James Audubon, F. R. SS. L. & E.
GENUS IV.--HELINAIA, Aud. SWAMP-WARBLERS.
Bill rather long, being nearly of the same length as the head, straight, or
slightly decurved, tapering to a very acute point, much compressed; the upper
mandible with the ridge distinct, the sides declinate and flat at the base, the
edges somewhat inflected beyond the middle, the notch obsolete; lower mandible
with the dorsal line straight, the edges involute, the tip extremely acute.
Nostrils oblong; exposed. Feet of moderate length; tarsus about equal to the
middle toe and claw, slender, much compressed, with the upper scutella blended;
toes slender; claws rather long, moderately arched, slender, much compressed,
laterally grooved, extremely acute; plumage soft and blended. Bristles
obsolete. Wings rather long, somewhat pointed, the outer three nearly equal,
the second longest. Tail of moderate length, nearly even.--Name from [`Elos], a
swamp, and [Naio], to inhabit.