362 BULLETIN 133, UNITED STATES NATIONAL MUSEUM 



2, female, October 25 ; Guamini, Buenos Aires, adult male, adult and 

 immature females March 7, 1921 ; Zapala, Neuquen, immature male 

 (Juvenal dress) December 8, 1920; Tunuyan, Mendoza, adult male, 

 March 28, 1921. The present species may be distinguished from A. 

 furcatus, with which it is often associated, by the nearly straight, 

 much elongated hind claw, longer bill, and more distinctly streaked 

 plumage. Streaks on the flanks are blackish and plainly marked, 

 instead of indistinct as in furcatus. 



Limits of subspecies in this pipit ^^ are difficult to draw. A skin 

 from Tunuyan, Mendoza, is clearly intermediate toward chilensis, 

 but seems best allotted to cori^endera. A bird in ju venal plumage 

 from Zapala, Neuquen, seems to belong to the typical form. 



These pipits were abundant on the eastern pampas near Dolores 

 and Lavalle, but were not noted in numbers elsewhere. During the 

 breeding season, in October and November, males rose constantly 

 to sing on the wing, circling with direct flight and rapidly flitting 

 wings, a flight distinct from their undulating movement at other 

 times. When tired the wings were set and the bird dropped slowly 

 into the grass to rise and continue its evolutions in a short time. On 

 October 21, near Dolores, a female flushed from a nest at my feet, 

 ran rapidly away, and after a short flight joined her mate. The nest, 

 placed in a mat of dead grass stems, was a cup composed of grass 

 stems sunk in a little hollow so that its margin was flush with the 

 surface. It was entirely concealed from above except for the open- 

 ing that led into the cavity. Bottom and sides were damp from 

 moisture that exuded from the soil so that the eggs were wet. The 

 three slightly incubated eggs have a dull white ground color and 

 are covered heavily with an irregular wash and spotting of natal and 

 bone brown. The shell was very delicate. They measure 21. T by 

 15.4; 21.6 by 14.9; and 21.1 by 14.9 mm. 



Apparently two broods may be reared, as though young were fully 

 grown at Zapala, Neuquen, on December 8 and 9, males were still 

 in song. On January 31 a breeding male (the only one of the species 

 seen in Uruguay) was taken on the open shore of the Laguna Cas- 

 tillos, near San Vicente. 



Near Guamini, Buenos Aires, the birds were common in grass, in 

 little scattered flocks, March 7 and 8, and adults and young taken 

 were in molt into fall plumage. The tongue in these individuals 

 was blackish, being almost jet black in juveniles and paler in adults. 

 One was shot in the act of eating a butterfly {C'olias leshia Fabricius) 

 that was captured where it had sought shelter from cold and wind 

 in the grass. Near Tunuyan, Mendoza, these pipits were noted at 

 times in weed-grown fields. 



6'' See Hellmayr, El Hornero, vol. 2, August, 1921, pp. 185-188. 



