BIRDS OF ARGENTINA, PARAGUAY, URUGUAY, AND CHILE 327 



taken September 25, 11>20, two from the Cerro Lorito on the east 

 bank of the Rio Paraguay opposite Puerto Pinasco, secured Sep- 

 tember 30, and one from Tapia, Tucuman, collected April 8, 1921, 

 are referred to the typical form, as they agree in color with three 

 seen from Taquara do Mundo Novo, Rio Grande do Sul, and have 

 the measurements assigned by Hellmayr ^^ to that form. The wing 

 in these birds, in the order cited, measures as follows : 53, 55.4, 55.8, 

 55.2, and 54.3 mm. As these represent the chord of the folded wing 

 taken with dividers, they are comparable with Doctor Hellmayr's 

 figures, in Avhich it is supposed that tlie wing was measured flat. 



Mr. Ridgway ^^ has removed OrnitJiion iner?ne, the type of Orni- 

 thion Hartlaub to the Pipridae, as it has a pycnaspidean tarsus, 

 leaving the species with exaspidean tarsi, that have been associated 

 with it, in the Tyrannidae under the name G cvm'pto stoma of Sclater. 



This small bird was of local occurrence and was seldom seen. At 

 Resistencia the one taken was shot from a little flock of three that 

 came flitting actively through some low trees in dense growth, occa- 

 sionally uttering a vireolike, scolding note. Near Laguna Wall, in 

 the Chaco, 200 kilometers west of Puerto Pinasco, the birds were 

 fairly common in the dense growths of thorny vinal that covered 

 large areas. On September 30, near the Rio Paraguay, I found a 

 number in heavy timber over a wet area where the forest was open. 

 The birds Avere seen high in the tops of the still leafless trees, 

 where they perched quietly except when they darted out to secure 

 passing insects. Their song was a rattling, laughing chee chee chee 

 chee chee that was almost swiftlike in its tones. In fall, near Tapia, 

 Tucuman. the species was encountered again in low scrub in company 

 with other small, brush-haunting birds. 



One taken July 8 had the tip of the mandible blackish; base of 

 culmen dull slate; rest of mandible pinkish white, becoming dull 

 orange at gape; inside of mouth, orange; iris, broAvn; tarsus, slate 

 black. 



ELAENIA ALBICEPS ALBICEPS (d'Orbigny and Lafresnaye) 



Muscipeta albiceps cFOrbigxy and Lafresnaye, Mag. Zool., 1837, cl. 2, p. 47. 

 (Yungas, Bolivia.) 



The present species seems to be one that ranges throughout Pata- 

 gonia, north at least to the Rio Negro, and that northward extends 

 through the foothills of the Andes in Chile and Argentina to south- 

 ern Peru. In Argentina it is reported from the isolated Sierra de 

 Cordoba. From examination of a considerable series it seems that 

 albiceps differs from E. parvirostris, which superficially appears 

 identical in narrower bill, browner, less greenish dorsal coloration, 



«Nov. Zool., vol. 15, June, 1908, p. 44. 



i» Proc. Biol. Soc. Washington, vol. 19, Jan. 29, 1906, p. 14. 



