THRYOTHORUS. 



121 



The characters of these two divisions will be found detailed in 

 the introductory remarks, and under their respective heads. Troglo- 

 dytes, with its two sections, is very closely related to Thryothorus, 

 as restricted, so much so that it is very difficult to draw the line. 

 The supposed differences referred to by many authors resulted from 

 the comparison of Troglodytes with Thryophilus, rather than with 

 true Thryothorus. 



In the following synopsis I present an artificial key to the species 

 of Tliryothorus, Pheugopedius, and Thryophilus, found in North 

 and Middle America, with their nearest South American allies, and 

 based entirely on color and markings. T. pleurostictus I know only 

 by description, and may not have worked it in properl}^. A more 

 natural arrangement, based upon the peculiarities of structure, fol- 

 lows the first. 



Synopsis of Species. 

 A. Head above and back of much the same color. 



a. Crissum barred transversely ; rest of under parts 

 spotted or banded conspicuously with black (ex- 

 cept in felix) . 



1. Outside of wings banded ; head like the 



back. 

 a. Throat white ; rest of under parts black, 



finely banded with white . . . fasciato-ventris. 

 0. Under parts pure white ; sides from 



neck to crissum banded with black . pleurostictus. 



2. Outside of wings plain ; head more rufous 



than the back. Sides of head and neck 

 white, conspicuously streaked with black ; 

 wings longer than tail, except in felix. 

 a. Beneath white, spotted with black from 



chin to belly. Flanks rusty . . maculipectus. ' 

 a. Chin and upper throat black, spotted 

 with white ; rest of under parts plain 



rufous rutilus. 



y. Beneath whitish, unspotted ; on sides 

 brown. Upper tail covert barred. Tail 

 longer than the wings .... felix. 

 h. Crissum barred transversely ; rest of under parts 

 plain. 



1. Upper tail coverts and exposed surface of 

 wings barred. 



a. Tail feathers reddish-brown, barred 

 with black. Greater wing coverts spot- 

 ted with whitish. 



1. Beneath rusty white . . , ludovicianus. 



2. Beneath rusty brown . . . berlandieri. 



