310 PROCEEDINGS OF THE ACADEMY OF [1899. 



rufous tail contrasting with the browner tint of the back and the 



strongly rufous under tail coverts and thighs, the former with the 



bars much reduced and sometimes nearly wanting. 



Many names have been proposed for the birds of this group, of 



which the following seem to be recognizable. 



1. Troglodytes musculus Naum. Vogel's Deutschland, 1823. 



T. furvus Wiedii Berl. 

 T. platensis Wied. 



Distribution, — Brazil, Ai'gentine and Uruguay (type loc, Bahia, 

 Brazil), 



This is the darkest form, with obscure bars of blackish on the 

 back always present. Under surface vinaceous, darker and inclin- 

 ing to rufous on the flanks and under tail coverts, but not nearly 

 so tawny as in the west-coast races. Under tail coverts barred or 

 distinctly spotted with black, in direct contrast to the nearly uni- 

 form rufous-coverts of the western races. 



This bird has been frequently called T. furvus Gm. , but I agree 

 with Sharpe and Allen in the impossibility of satisfactorily identi- 

 fying the " Brown Warbler " of Brown's Illustrations of Zoology, 

 upon which Gmelin based his name. Berlepsch seems to have 

 regarded the Guiana bird (rufulus) as true " furvtis," and renamed 

 this form T. f. Wiedii, claiming that although Wied' s description 

 of T. platensis is unquestionably this form, it is not Sylvia platensis 

 Lath., which he quotes, T. musculus Naum antedates Berlepsch' s 

 name, and must of course be adopted, 



2. Troglodytes musculus rufulus Cab. Schomb., Reis. Guian., iii, p. 672 (1848). 

 T. tobagensis Lawr. 



Distribution. — Guiana, Venezuela and N. E. Colombia (type 

 loc, Roraima, Guiana). 



This is a light-colored race banded on the back as in T. musculus, 

 but much paler and sometimes quite white below. 



3. Troglodytes musculus rex (Berl. andLeverk). 

 Distribution. — Eastern Bolivia (type loc, Samarpata), 

 A pale form of musndus. 



4. Troglodytes musculus hornensis (Less.). 

 T. rosaceus Less. 



T. pallida Lafr. and d'Orb. 

 T. magellanicus Gould. 



Distribution. — Chile and Patagonia, 



