HELE0DYTE8. 95 



does not form a bridge. Tail about two-thirds 



the wings 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 . . . ' . . 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 ..... 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 .... Thryothorns. 

 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. 



c. 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 ...... Telmatodytes. 



2. Bill shorter than the head. Hind claw 



equal to the rest of the toe .... Cistothorus. 



HELEODYTES, Cabanis. 

 Eeleodytes, Cab. 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. 



