HELEODYTES. 95 
does not form a bridge. Tail about two-thirds 
the wings . : c c < 5 - . Heterorhina. 
d. Nostrils broadly open, and exposed ; not overhung 
by a scale, and showing a lateral vertical septum 
extended forwards above; anterior half in the 
end of nasal groove. Bill distinctly notched. 
Tarsi longer than middle toe and claw. Tail 
about equal to the wings . 5 : : » Thryophilus. 
F. Bill not notched, slender, or very deep. Nostrils linear, 
on lower edge of nasal groove, and overhung, sometimes 
concealed, by an arched or vaulted thickened mem- 
brane with rounded edges. Lateral toes about equal. 
a. Bill very stout and deep, as long as the head; 
height about one-third the length above. Wings 
about equal to the tail : ; : s - Pheugopedius. 
b. Bill slender. Tail about equal to the wings, or, if 
shorter, only moderately graduated (outer at 
least four-fifths of central). Hind claw shorter 
than the rest of the toe. A lateral nasal septum, 
vertical and projecting into the posterior portion 
of the nasal cavity. 
1. Bill as long as the head. Tail feathers 
broad, about as long as the wings. 
Tail equal to the wings . : : . Thryothorus. 
Tail longer than the wings. . - Thryomanes. 
2. Bill shorter than the head. Tail feathers 
narrow. Colors plain. 
Tail equal to the wings . : : . Hylemathrous. 
Tail shorter than the wings . : - Troglodytes. 
ce. Bill slender. Tail shorter than the wings, very 
much graduated. Lateral feathers about two- 
thirds the central. Hind claw as long as rest of 
toe. 
1. Bill as long as the head. Hind claw longer 
than rest of toe . R 5 : ; . Telmatodytes. 
2. Bill shorter than the head. Hind claw 
equal to the rest of the toe . . : . Cistothorus. 
HELEODYTES, Caznanis. 
Heleodytes, Cas. Mus. Hein. I, 1850, 80. (Type Furnarius griseus, Sw.) 
Bill longer than head, without notch or rictal bristles. Nostrils broadly 
oval, in the anterior extremity of nasal groove, bordered behind by a naked 
membrane as in Donacobius. Commissure curved gently, not angulated; 
gonys straight. Wings about length of tail. First primary considerably 
more than half the longest ; second longer than secondaries. Tail moderately 
graduated ; outer feather about five-sixths the middle; outer web of exterior 
feather about one-third the inner. Tarsi scarcely longer than the middle toe. 
Colors plain, without dark spots or bars. 
