540 NORTH AMERICAN BIRDS. 



b\ "Wing less than 3.00. 



c 1 . Outer toe much longer than the inner. 



d 1 . Exposed culmen shorter than tarsus ; posterior lower parts whitish 



or pale cinnamon Salpinctes. (Page 547.) 



d 1 . Exposed culmen longer than tarsus; posterior lower parts deep 

 rusty or brownish, more or less speckled with dusky or whitish, 



or both Catherpes. (Page 548.) 



c 2 . Outer toe not distinctly longer than the inner. 



d l . Tail little, if any, shorter than tarsus and middle toe together. 

 e 1 . Nostril opening horizontally along lower edge of nasal fossse, 

 and overhung by a more or less projecting scale-like mem- 

 brane. 

 f 1 . Back without streaks ; tail graduated for less than one- 

 third its length, the lateral pair of feathers reaching 

 decidedly beyond tips of longest under coverts. 

 g 1 . Bill rather abruptly decurved at tip, stout (or else tail 

 decidedly longer than wing); a conspicuous, sharply 

 defined (usually whitish) superciliary stripe. 

 h 1 . Length of wing exceeding that of tail by less 

 than length of exposed culmen (tail some- 

 times equal to or even longer than wing). 



Thryothorus. (Page 549.) 

 h 1 . Length of wing exceeding that of tail by much 

 more than length of exposed culmen. 



Uropsila. 1 

 g\ Bill more slender, more gradually decurved at tip 

 (sometimes nearly straight throughout) ; super- 

 ciliary stripe not conspicuous (sometimes nearly 



obsolete) Troglodytes. (Page 552.) 



f*. Back streaked with black and white ; tail graduated for 

 about one-third its length, the lateral pair of feathers 

 reaching little, if any, beyond tips of longer under 



coverts Cistothorus. (Page 555.) 



e 2 . Nostril small and nearly circular, opening in the anterior por- 

 tion of the nasal fossas, and without overhanging scale or 

 membrane. (Otherwise, very much like Thryothorus.) 



Thryophilus. 3 



d 2 . Tail much shorter than tarsus and middle toe together. (Nostril 



as in Thryophilus.') Henicorhina. 3 



i Uropsila Scl. A Salv., Nom. Neotr. 1873, 155. Type, Troglodytes leueogaetra Gould. (Hab. Southern 



Mexico.) 



2 Thryophilus Baied, Review, i. August, 1864, 127. Type, Thryothorus rufalbus Lapb. (Six species in 

 Mexico and Guatemala, with others farther southward.) 



8 Senicorhina Scl. & Salv., P. Z. S. 1868, 170. Type, Cyphorhinus leucostictus Cab. {Hab. Southern 

 Mexico to northern South America.) 



