540 NORTH AMERICAN BIRDS. 



h\ Wing less than 3.00. 



&. Outer toe much longer than the inner. 



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



or pale cinnamon Salpinctes. (Page 547.) 



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

 rusty or brownish, more or less speckled with dusky or w^hitish, 



or both Catherpes. (Page 548.) 



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



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

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

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

 bi'ane. 

 p. Back without streaks ; tail gi-aduated for less than one- 

 third its length, the lateral pair of feathers reaching 

 decidedly beyond tips of longest under coverts. 

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

 decidedly longer than wing); a conspicuous, sharply 

 defined (usually whitish) superciliary stripe. 

 h}. 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?. 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.) 



p. 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^ Nostril small and nearly circular, opening in the anterior por- 

 tion of the nasal fossse, and without overhanging scale or 

 membrane. (Otherwise, very much like Thryothorus.) 



Thryophilus.'^ 



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



as in Thryophilus.) Henicorhina.^ 



1 Uropsila ScL. & Salv., Norn. Neotr. 1873, 155. Type, Troglodytes leueogastra Gould. {Hub. Southern 

 Mexico.) 



2 Thryophilus Baird, Review, i. August, 1864, 127. Type, Thryothorus rnfulbus Lafr. (Six species in 

 Mexico and Guatemala, with others farther southward.) 



^ HenicorUna ScL. & Salv., P. Z. S. 1868, 170. Type, Cyphorhinus leucostictus Cab. {Hab. Southern 

 Mexico to northern South America.) 



