570 BULLETIN 50, UNITED STATES NATIONAL MUSUEM. 



late, the plauta tarsi booted; outer toe (without claw) reaching to a 

 very little beyond second (subterminal) joint of middle toe, its claw 

 falling a little short of base of middle claw; inner toe (without claw) 

 reaching to but not beyond subterminal joint of middle toe; hallux 

 (without claw) as long as outer toe (without claw), its claw much 

 shorter than the digit; basal phalanx of middle toe adherent to outer 

 toe for nearlj^ its entire length, to inner toe for more than half (usually 

 much the greater part) of its length. 



Coloration. — Above brown, the remiges and rectrices (sometimes 

 back also) narrowly (sometimes indistinctly) barred with dusky; 

 superciliary stripe (more or less distinct) and under parts whitish or 

 cinnamomeous, the under tail-coverts usually (sometimes flanks also) 

 barred with black or dusk3\ 



Nldificatlon.—^Qst in cavities of stumps, logs, or trees, or about 

 buildings, composed largely of dead twigs; eggs white or pinkish, 

 profusel}^ sprinkled with reddish brown. 



Bange. — Whole of temperate and tropical America, except Greater 

 Antilles, Guadalupe, and Revillagigedo islands, and Galapagos Archi- 

 pelago. (Numerous species.) 



KEY TO THE SPECIES AND SUBSPECIES OF TROGLODYTES. 



a. Tail more than three-fourths as long as wing. 



h. Superciliary stripe indistinct, or at least not sharply defined; throat and chest 



not distinctly cinnamon or cinnamon-buff, or if approaching tlie latter color 



the flanks not distinctly barred. 



c. Larger (wing 56-60, tail 46-49, tarsus 20.5-22) ; under parts dull pinkish buff, 



the under tail-coverts very narrowly barred with dusky brown; rectrices 



and remiges obsoletely barred. (Clarion Island, northwestern Mexico.) 



Troglodytes tanneri (p. 573) 

 cc. Smaller (wing less than 56, tail usually much less than 46, tarsus usually less 

 than 20) ;« under parts not dull pinkish buff; under tail-coverts broadly 

 barred (except in some extralimital forms); rectrices and remiges dis- 

 tinctly barred. 

 d. Bill larger (exposed culmen 15.5-18); posterior upper ^mrts russet, dis- 

 tinctly different from grayish brown of pileum; median under parts pure 



white. (Cozumel Island, Yucatan. ) Troglodytes beani (p. 573) 



dd. Bill smaller, exposed culmen 11-15 (usually much less than 15) ; posterior 

 upper parts not russet, or else the color not conspicuously different from 

 brown of pileum; under parts not pure white medially. 

 e. Tail relatively shorter (less than five-sixths as long as wing, 31-40, averag- 

 ing less than 39); under tail-coverts with ground color mostly pale 

 cinnamon. 

 /. Under parts mostly white, nearly pure on throat and abdomen; upper 

 parts grayer; feet more slender (as in T. aedon); wing relatively 

 shorter, tail longer (averaging 50.5 and 38.2, respectively, in adult 

 male). (Coast of Yucatan.) Troglodytes peninsularis (p. 574) 



«The only form in which the tail reaches 46 and the tarsus more than 20.5 mm. is 

 T. beani, which differs in other characters opposed to those of T. tanneri. The tarsus 

 sometimes measures 21 in T. musculus inquielus. 



