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.) 



(P. 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 1 . Tail little, if any, shorter than tarsus and middle toe together. 

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

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

 decidedly longer than wing) ; a conspicuous, sharply 

 defined (usually whitish) superciliary stripe. 

 A 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.) 



A 2 . Length of wing exceeding that of tail by much 

 more than length of exposed culmen. 



Uropsila* 



g*. Bill more slender, more gradually decurved at tip 

 (sometimes nearly straight throughout) ; super- 

 ciliary stripe not conspicuous (sometimes nearly 



obsolete) Troglodytes. (Page 552.) 



/ 2 . 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 fossae, and without overhanging scale or 

 membrane. (Otherwise, very much like Thryothorus.) 



Thryophilus.* 



d 1 . Tail much shorter than tarsus and middle toe together. (Nostril 

 as in Thryophilus.') Henicorhina? 



1 Uropsila SCL. & SALV., Norn. Neotr. 1873, 155. Type, Troglodytes leucogastra GOULD. (Hab. Southern 

 Mexico.) 



1 Thryophilus B.unn, Review, i. August, 1864, 127. Type, Thryothorus rufalbus LAFR. (Six species in 

 Mexico and Guatemala, with others farther southward.) 



8 Henicorhina SCL. A SALT., P. Z. S. 1868, 170. Type, Cyphorhinus leucostictus CAB. (Hal. Southern 

 Mexico to northern South America.) 



