296 BULKETIN 133, UNITED STATES NATIONAL. MUSEUM 



otherwise resemble adults. These birds are in molt from juvenal 

 to first winter plumage. 



Near Concon, Chile, the large Agriornis was common from April 

 24 to 28, 1921. The birds Avere found on open flats near the Rio 

 Aconcagua, or in pastures dotted with bushes on the hill slopes 

 above, where they rested quietl}^ on the top of some bush that offered 

 outlook. Occasionally one dropped down to the ground where, like 

 a robin, it ran rapidly along for a few steps and then paused ab- 

 ruptly with head thrown up and body erect. The long, heavy bill 

 marked them from other birds of similar size, even at a distance. 

 All were silent. 



In the adult male of this species the tenth primary is abruptly 

 narrowed at the tip for 10 to 16 mm., while the tip of the ninth is 

 narrowed for about half the amount of the tenth. In females the 

 primaries are normal. In the male taken at Concon the primaries 

 resemble those of the female. Apparently this sexual distinction 

 does not develop until the primaries have been molted once, so that 

 the wing of males in their first winter is like that of females. 



The male shot April 24 had the maxilla dull black ; mandible light 

 drab, shaded with deep quaker drab toward the tip; iris anny 

 brown; tarsus and toes, dull black. 



AGRIORNIS STRIATA STRIATA Gould 



Agriornis striaius Goulu, ZooI. Voy. Beagle, pt. 3, Birds, 1839, p. 56. 

 (Santa Cruz, Argentina.) 



Specimens of the present species secured number three, an adult 

 male from General Roca, Rio Negro, taken November 29, 1920, an 

 adult female from Zapala, Neuquen, shot December 7, and a male 

 from Tunuyan, Mendoza, collected March 27, 1921. The two sum- 

 mer birds are in somewhat worn breeding dress, while the fall skin 

 is in full winter plumage. The female has the two outermost pri- 

 maries very slightly sinuated on the outer margin. In adult males 

 the ninth and tenth primaries are narrowed distally, and are incised 

 deeply for 12 to 16 mm. at the tip, this incision being only slightly 

 less on the ninth than on the outermost primary. The form Agri- 

 ornis s. andecola^^ of which I have seen no specimens, is said by 

 Berlepsch ^* to differ from tlie typical bird in having fainter brown- 

 ish black throat stripes and a stronger buffy wash on the lower 

 surface. It ranges in the higher Andes of western Bolivia. 



Near General Roca, Rio Negro, these flycatchers were encountered 

 on November 29, 1920, and again on December 2, in a region of arid 

 gravel hills covered with an open growth of low brush. They often 



''^ Pepoaza andecola d'Orbigny, Voy. Amer. Merid., vol. 4, pt. 3, Oiscaux, 1835-1844, 

 p. 351. (5,000 meters above the sea, in Bolivia.) 



■^^Proc. Fourth Int. Ornith. Con<r., February, 10O7, p. 464. 



