BIRDS OF ARGENTINA, PARAGUAY, URUGUAY, AND CHILE 249 



In the Chaco the ovenbird, while it came regularly about the older 

 e«tancia houses and the small towns, was more of a bird of the 

 country than in the pampas. The birds ranged through tracts of 

 open groves near savannas, and did not penetrate far into the 

 denser forests. Open borders of lagoons were favorite feeding 

 places, and in such places horneros sometimes congregated until sev- 

 eral were feeding in a relatively small area. When thus engaged 

 they often suggested sandpipers, particularly when seen at a dis- 

 tance. In walking they frequently take several long steps, pause 

 with one foot raised for an instant, and then continue. Their gait 

 is easy and, when desired, as rapid as that of a blackbird. On 

 September 3, at I'uerto Pinasco, one Avas observed carrying food to 

 young in the nest. 



The Toba Indians called this species kwo ti ih. 



UPUCERTHIA DUMETARIA Is. Geoff. Saint-HUaire 



Upucerthia Dumctaria Is. Gbx)ff. Saint-Hilaibe, Nouv. Ann. Mas. Hist. 

 Nat. (Paris), vol. 1, 1832, p. 394. (Patagonia.) 



A male shot at General Roca, Rio Negro, November 23, 192l\ 

 and another taken April 28, 1921, at Concon, Chile, are difficult 

 to place subspecifically with the comparative material at present 

 available. The bird from Roca, in worn breeding plumage, is 

 slightly more rufescent than specimens that may represent true 

 dumetaria from farther south in Rio Negro. It thus shows ap- 

 proach to Vfucerthia duTiietaria darwini Scott,"'' according to the 

 original description. The specimen has the following measure- 

 ments: Wing, 105.2; tail. 76.2; culmen from base, 34; tarsus, 

 25.2 mm. 



The bird from Concon, Chile, is much darker in color throughout 

 and belongs to another form. It would appear that this is Upu- 

 certhia dumelaria saturatior Scott,^^ the type of which may have 

 come from the vicinity of Valparaiso. Upucerthia tamucoensh 

 Chubb ^- is doubtfully distinct from saturatior. The specimen from 

 Concon measures: Wing, 96.8; tail, 70.6; culmen from base, 31.5; 

 tarsus, 24 mm. It seems to possess the smaller measurements at- 

 tributed by Chubb to faTnucoensis. 



Near General Roca this species was found among the heaviest 

 growths of A triplex and other shrubs in the lowland flood plain of 

 the Rio Negro, where it was recorded on November 23, 24, and 27. 



^ Upucerthia dartoini Scott, Bull. Brit. Orn. Club, vol. 10, Apr. 30, 1900, p. Ixlii. 

 (Mendoza.) 



^ Uptwerthia saturatior Scott, Bull. Brit. Orn. Club, vol. 10, Apr. 30, 1900, p. Ixiil. 

 (Central Chile, "ex Berkeley James Coll.") 



^ (Upucerthia tamucoensis Chubb, Bull. Brit. Orn. Club, vol. 27, July 13, 1911, p. 101, 

 ("Tamueo" southern Chile.") 



