BIRDS OF ARGENTINA, PARAGUAY, URUGUAY, AND CHILE 267 



At Victorica, Pampa, at the end of December young were out of 

 the nest, and though fully grown were still fed by their parents. 

 Young birds, fully grown, were secured in Uruguay late in January, 

 and one was taken at Tapia in April, In the Chaco this species was 

 known as Alomo ca-a guepe. 



SIPTORNIS D'ORBIGNYII CRASSIROSTRIS (Landbeck) 



SynQ,llaxis crassirostris Landbeck, in Leybold, Anales Univ. Chile, vol. 26, 

 no. 6, June, 1865, p. 713. (Between Melocoton and the Rio Tunuyan, 

 Mendoza. ) 



A female Siptomis secured on the arid flats above the city of 

 Mendoza, on March 13, 1921, seems to agree with Hellmayr's ob- 

 servations regarding this form,^^ The specimen in question has 

 renewed the tail feathers and the wing feathers, save for the pri- 

 mary coverts, while feathers of the head are still in molt. The bird 

 has a distinct rufous throat patch, the outer rectrix is wholly cinna- 

 mon, the second one is cinnamon, save for the end of the shaft and 

 an elongate patch on the inner web near the tip which are blackish. 

 The third rectrix has nearly half of the web at the distal end 

 blackish, while the fourth rectrix is black, except for the basal half 

 of the outer web. The fifth has the cinnamon color still more re- 

 stricted, while on the sixth there is a mere wash of cinnamon near 

 the base of the outer web. The lower rump is cinnamon like the 

 upper tail coverts. The wings are distinctly washed with the 

 same color. 



From Siptomis steinhachi, which was found near Mendoza in 

 the same area, /S. d. crassirostris differs in paler brown lower mandi- 

 ble, rusty throat patch, whiter under surface, lighter dorsal region, 

 browner crown, and in differently marked rectrices as indicated 

 under steinbachi. 



As no typical specimens of cPorhignyii are at hand for comparison, 

 the individual from Mendoza is allocated subspecifically solely on its 

 agreement with Hellmayr's statement concerning crassirostris. A 

 skin presented to the United States National Museum by Mr. B. H. 

 Swales, collected by L. Dinelli near Colalao del Valle, Tucuman, 

 at an altitude of 2,500 meters, seems to stand intermediate between 

 d' orhignyii and crassirostris^ as the upper parts are more rufescent 

 than in the bird from Mendoza, though the tail is the same. 



These birds usually were found in pairs that ran or hopped about 

 on the ground beneath the scattered bushes or clambered swifty 

 through the branches. When excited they chattered and called, and 

 worked rapidly away through the brush. They are characterized 

 by large size and distinctly reddish-brown coloration. 



»Verh. Ornlth. Ges. Bayern, vol. 13, Feb. 25, 1917, p. 116. 



