478 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



ee. Wing not more than two and a half times as long as tarsus ; back uni-- 



colored; head and neck never white. 



/. Maxillary tomium without trace of notch, « or else nostril distinctly 



operculate; nostril distinctly operculate. 



g. Tail graduated for nearly one-third its length, or more; ninth primary 



much shorter than secondaries, the eighth not longer than third 



(usually not longer than second); nostril much narrower than the 



broad, more convex, more membraneous, and more deeumljent 



operculum; bill and feet stouter; rump without concealed white 



spots Pheugopedius (p. 527) 



gg. Tail graduated for much less than one-third its length (usually for 

 less than one-fourth); ninth primary not conspicuously shorter 

 than secondaries, or else exposed culmen longer than middle toe 

 (with claw) ; eighth primary equal to or longer than fifth; nostril 

 broader, nearly as wide as (sometimes wider than) the narrower, 

 straighter (sometimes more or less arched), more corneous and 

 excurrent, operculum; bill and feet weaker; rump with concealed 

 white spots, or else ninth primarj^ shorter than secondaries and 

 tail shorter than combined length of tarsus and middle toe (with 

 claw). 

 h. Rectrices 12; tail not less than two-thirds as long as wing; hallux 

 much shorter than middle toe (without claw). 

 i. Tail decidedly longer than combined length of tarsus and middle 

 toe (with claw), much more than two-thirds (usually more 

 than three-fourths) as long as wing, or else '^ bill stout-subulate, 

 the culmen decidedly decurved terminally, the ninth primary 

 shorter than secondaries, middle toe (without claw) not more 

 than two-thirds as long as tarsus, and rump without concealed 

 white spots. 

 j. Hallux (without claw) decidedly longer than outer toe (with- 

 out claw) Thryotliorus (p. 539) 



jj. Hallux (without claw) not longer than outer toe (without 

 claw ) . 

 k. Nostril narrower (not wider than its operculum), hnear; bill 

 lower at base and less tapering, its depth at latero-frontal 

 antije not greater than its width at same point and equal 

 to very little more (usually much less) than one-third the 

 distance from nostril to tip of maxilla; lateral rectrices 

 spotted terminally with pale gray or otherwise irregularly 



marked Thryomanes (p. 548 ) 



kk. Nostril broader (as wide as or wider than its operculum) , 

 more or less ovate, cuneate, or guttate; bill higher at base, 

 more tapering, its depth at latero-frontal anti?e equal to 

 at least one-third the distance from nostril to tip of 

 maxilla; lateral rectrices narrowly barred terminally. 



Troglodytes (p. 569) 



a The only exception to the absence of a subterminal notch to the maxillary tomium 

 in this group is in some species of the genus Pheugopedius, in which it is sometimes 

 more or less indicated, but is never so distinct as in all the forms of the opposed 

 group {ff), in which the nonoperculate nostrils in combination with the notch afford 

 an easily recognized distinctive character. 



^In Troglodytes, part (T. solstitialis and T. ochraceus). 



