1899.] NATURAL SCIENCES OF PHILADELPHIA. 311 



The Wrens of the Pacific coast of South America are paler than 

 true musculus, and are generally without bars on the back, and 

 with the under tail coverts nearly or quite uniform tawny, the 

 flanks and rump are also much more conspicuously tawny and the 

 whole plumage paler. The specimens I have examined from 

 Patagonia and Chile are darker than those from Callao, Peru, 

 which seem to be T. m. audax. If this determination is correct, 

 then T. m. audax is the lightest colored, most rufous of the genus, 

 and T. hornemU is intermediate between that and T. musculus. If 

 hornensis and audax are both based on pale-colored birds, then 

 they may have to be regarded as synonyms, and T. magellanicus 

 revived for the darker more southern birds, 



T. hornemis is usually described as very pale and rufous, in 

 which case I cannot separate it from T. audax of Callao. Sharpe 

 {Cat. Bds., vi, p. 207) seems to regard T. audax as not deter- 

 minable; if this vicAV is followed then probably hornensis and 

 magellanicus should be adopted as above. 



The darker Chilean birds which I here regard as T. hornensis 

 are lighter than musculus with more tawny tail, under tail coverts 

 with but few spots and back without bars. 



5. Troglodytes musculus audax (Tschudi). 



Distribution. — Coast of Peru (type loc, Peru). 



Palest of the group; rump, flank and tail very bright tawny, 

 and dark bars on the tail indistinct and suffused with the prevail- 

 ing tawny tint. No bars on the back. 



6. Troglodytes musculus tecellatus (Lafr. and d'Orb.). 

 (?) T. murinus Less. 



Distribution. — Peru (type loc, Tacna). 



This is a darker bird with distinct cross bars on the back differ- 

 ing in this respect from all the other trans- Andean forms. From 

 musculus it differs in being much more rufous both above and below. 

 The tail is very distinctly barred with black, presenting a very 

 different appearance from that of T. audax. Mr. Kidgway states 

 that the specimens in the Lafresnay collection labelled as the 

 types of this species are in reality T. brunneicollis of Mexico. 

 The labels must have been confused, however, as the description is 

 certainly not from that bird. 



