Birds of America
By John James Audubon, F. R. SS. L. & E.
GENUS I.--VIREO, Vieill. GREENLET.
Bill rather short or of moderate length, rather strong, straight, broader
than high at the base, compressed toward the end; upper mandible with the dorsal
line slightly convex, the ridge narrow, the sides sloping and towards the end
somewhat convex, the edges straight, the notches distinct, the tip small,
decurved, acute; lower mandible with the angle of moderate length and rather
narrow, the dorsal line ascending and rather convex, the sides convex, the edges
inclinate, the tip acute and ascending. Nostrils basal, oblong. Head rather
large, ovate; neck short; body rather stout. Tarsus rather short, slender,
compressed, with seven scutella; toes small, first large, inner considerably
shorter than outer, which is adnate at the base. Plumage soft and blended;
bristles small. Wings rather long, with the second and third quills longest,
the first not much shorter. Tail of moderate length, nearly even.