BIRDS OF NORTH AND MIDDLE AMERICA. 477 



r. Bill Htouter, its depth at frontal antia; equal to nearly half the distance from 

 nostril to tip of maxilla, the exposed culmen not more than one-fifth as lonj; 

 as wing; outer plate of planta tarsi very much wider than outer side of 

 acrotarsium; end of inner toe (without claw) reaching nearly to middle of 



subtcrminal phalanx of middle toe Cianycerthia (extraliniital ) " 



cc. Bill more slender, its depth at frontal antiic decidedly less than distance from 

 nostril to tip of maxilla, the exposed culmen more than one-fifth (usually 

 more than one-fourth) as long as wing; outer plate of i)lanta tarsi little, if 

 any, wider than outer side of acrotarsium; end of inner toe (without claw) 

 falling far short of nuddle of subterminal ])lialanx of middle toe. 

 d. ilaxillary toniium without trace of subterminal notch, or else nostril dis- 

 tinctly operculate; ^ nostril distinctly operculate, or else (in some species 

 of HcIeodi/tfK) the bill without trace of notch and tail nearly as long as 

 wing. ' 



e. Wing nearly, sometimes more than, three times as long as tarsus; back con- 

 spicuously streaked, banded, or otherwise variegated (at least beneath 

 surface of plumage), or else hi-ad, neck, and under parts plain white, c 

 /. Smaller (wing not more than 57, tail not more than 50.5, usually much 

 less), with l)ill and feet much weaker; inner toe more closely coher- 

 ent to base of hallux than to base of middle toe.'^ 

 g. Exposed culmen much shorter than middle toe (without claw ) ; bill 

 stouter, less decurved, its depth at latero-frontal antije equal to 

 nearly half (sometimes more than half) the distance from nostril 

 to tip of maxilla; tail graduated for more than one-third its length, 

 the rectrices narrower, especially at tip; pileum streaked.*:' 



Cistothorus (p. 480) 

 gg. Exposed culmen equal to or longer than middle toe (without claw); 

 bill more slender and decurved, its depth at latero-frontal antia' 

 less than one-third the distance from nostril to tip of maxilla; 

 tail graduated for much less than one-third its length, the rectrices 

 broader, especially at end; pileum not streaked. 



Telmatodytes (p. 4S6) 



ff. Larger (wing not less than 60, tail not less, usually much more, than 



50), with bill and feet much stouter; inner toe more closely coherent 



at base to middle toe than to hallux Heleodytes (p. 500) 



(i Cinnycerthia Lesson, L'Echo du Monde Savant, ann^e xi, 1844, col. 182 (type, 

 r. Mmco/or Lesson =I/mnorntsMnin(/aLafresnaye); C'innicerlhia (emendation) Sclater, 

 Proc. Zool. Soc. Lond., 1855, 143.— Pn'.s/>?/.s- Cabanis, Mus. Hein., i, 1850, 80 (type, 

 LimnorniK canifrotis Lafresnaye). (Mountains of Colombia, Ecuador, and Peru; 

 three or four species. ) 



^The only exception I have been able to find in this group to complete absence of 

 subterminal notch to the maxillary tomium is in some species of PluugopeilliiK, in 

 which it is sometimes more or less indicated, but never distinct as in all the forms of 

 the opposed group (dd), from which the very different nostrils constitute an easily 

 recognized character. 



'"Some of the extraliniital species of IleleodiffeH do not conform to these color cliar- 

 acters. but they agree resi>ecting relative length of wing and tarsus. 



''In this character the genera Clutolhorux and Trlmatodiilen d'lfivr from all other 

 Troglodytida', which have the outer toe more closely coherent at the base to the 

 middle toe than to the hallux. 



'^Except in young and in adults of !<ome South .Vmerican species. 



