AVES DENDROCOLAPTID/E. 777 



SiPTORNis PATAGONiCA (d'Orbigny). 



Synallaxis patagonica d'Orbigny, Voy. Amer. Merid. Ois. p. 249 (1835- 

 1844) (Rio Negro). 



Description. — Adult male, 284473 Biol. Survey Colin., U. S. Dept. of 

 Agriculture, General Roca, Rio Negro, Argentina, November 25, 1920, 

 Alexander Wetmore. Total length, 5.35 inches; wing, 2.20; culmen, 

 .42; tail, 2.68; tarsus, .82. Very similar in general appearance to S. 

 baeri, with the same heavy bill, but throat patch larger and black with 

 prominent white tips to the feathers, brown wash on the flanks more ex- 

 tensive and tail much more black, the tawny color being restricted to the 

 outer web of the outer pair of feathers and a very narrow edging to the 

 next two pairs. 



GeograpJiical Range. — Patagonia (Rio Negro to Chubut). 



Mr. Peters found it at San Antonio and states that it is an active spe- 

 cies, though rather secretive and quick to take alarm. 



Hudson says: "this bird resembles the last [flavigularis) in color and 

 size, but is distinguished by its short tail, which it carries elevated like 

 the wren. It hops with great rapidity over the bare ground, and feeds 

 much about the roots of dwarf bushes." (P. Z. S. 1872, p. 544.) 



SiPTORNis SULPHURIFERA (Burmcister). 



Synallaxis sulphurifera Burmeister, P. Z. S. 1868, p. 636 (Buenos Aires). 



Description. — Adult male, 284986 Biol. Survey Colin., U. S. Dept. 

 Agriculture, Rocha, Lazcano, Uruguay, February 5, 1921, Alexander 

 Wetmore. Total length, 5.02 inches; wing, 2.20; culmen, .50; tail, 2.32; 

 tarsus, .72. Above pale snuff brown, greater wing coverts edged with dull 

 tawny, and shoulders bright tawny; the outer edge of several primaries is 

 strongly buff; tail pale tawny, middle pair of feathers darker, superciliary 

 and lores white, and ear coverts streaked with white, below dull white, 

 breast obscurely spotted or streaked with dusky and a saffron yellow spot 

 on the throat; flanks and under tail coverts light brown, bill and feet 

 dusky, under mandible lighter at base. 



The sexes do not appear to differ. An immature female collected by Dr. 

 Wetmore is strongly suffused with tawny buff, above and below, and 

 lacks the bright tawny shoulders. 



Geographical Range. — Uruguay, Argentina and northern Patagonia 

 (Rio Negro). 



