AVES TYRANNID/E. 797 



MusciSAXicoLA RUFiVERTEX d'Orbigny and Lafresnaye. 



Muscisaxicola rufivertex d'Orbigny and Lafresnaye, Syn. Av. p. 66 (1836) 

 (La Paz, Bolivia). 



Description. — Adult male, 51290, Acad. Nat. Sci. Phila., Mendoza, Ar- 

 gentina, February, 1871. Above clear light cinereous, with a large pale 

 chestnut spot covering the whole top of the head except the broad fore- 

 head, and narrower bands over the eyes; wing feathers, tail and upper tail 

 coverts blackish brown, a white superciliary line and whole under parts 

 white, tinged with cinereous; bill and feet black. Total length, 6.70 

 inches; wing, 4.02; culmen, .62; tail, 2.80; tarsus, 1.05. 



Geographical Range. — Bolivia and Peru to Chile and Argentina, and 

 western Patagonia (?). 



Muscisaxicola capistrata (Burmeister). 



Ptyonura capistrata Burmeister, J. F. O. i860, p. 248. 

 Muscisaxicola garretti Scott, Bull. Brit. Orn. Club, x. p. Ixv (1900) (Coy 

 Inlet, Patagonia). 



Description. — Adult male, P. U. O. C. 7643, near Coy Inlet, Patagonia, 

 October 21, 1896,}. B. Hatcher (type of M. garretti Scoii). Total length, 

 6.40 inches; wing, 4.35; culmen, .70; tail, 2.55; tarsus, 1.20. Above 

 ashy ("drab" of Ridgway), more buffy on the lower back; rump, upper 

 tail feathers and tail black, outer web of outermost buffy white with nar- 

 row edgings of the same on the next two ; wings ashy brown ; forehead 

 broadly black, whole of crown chestnut; lower parts pale ashy becoming 

 tawny on sides, flanks and under tail coverts ; bill and feet black. 



Geographical Range. — Western Bolivia, Chile, Argentina and Patagonia 

 throughout. 



The naturalists of the Princeton Expeditions secured this little known 

 bird on the sea coast near Coy Inlet in southeast Patagonia; a series of 

 four birds were collected at this point in October, 1896, and all of these 

 are adults in full breeding plumage. Other records of the species will be 

 found to extend its range over southern Argentina, Azul, Carhue and the 

 Rio Colorado. It has been recorded from the Rio Negro and the Chubut 

 Valley. Birds have also been collected in northeastern Tierra del Fuego. 



