_Thryothorus_, VIEILLOT, Analyse, 1816, 45. (Type, _Troglodytes
arundinaceus_, “_Troglodyte des Roseaux_,” VIEILL. Ois. Am. Sept.
II, 1807, 55 = _Sylvia ludoviciana_, LATH.)
[Line drawing: _Thryothorus ludovicianus_
7113]
GEN. CHAR. Bill compressed, rather slender; height about one fourth
the length above. Culmen and commissure gently curved throughout;
gonys straight; tip very obsoletely notched. Nostrils in the lower
edge of anterior extremity of the nasal groove, narrowly elliptical,
overhung by a stiff scale-like roof of the thickened membrane of the
upper part of the nasal groove, the crescentic edge rounded. The
septum of nostrils imperforate; the posterior part of the nasal cavity
with a short septum projecting into it parallel with the central, not
perpendicular as in _Microcerculus_. Wings and tail about equal, the
latter moderately rounded; the first primary more than half the
second, about half the longest. Tarsi rather short, scarcely exceeding
middle toe. Anterior scutellæ distinct, rest of each side of tarsi in
a continuous plate. Lateral toes equal.