AVES TYRANNIC^. 79 1 



ocular streak ; ear coverts silvery white streaked with black ; wings black, 

 primaries with a large part of the outer web tawny, tertials and coverts 

 brown with light ashy edgings, median coverts with black bases and 

 shafts ; tail black with outer web of outermost feathers white, and narrow 

 grayish edgings to the others ; under parts white, flanks and sides tawny 

 ochraceous, narrow black streaks on the breast and two narrow molar 

 stripes on each side of the throat, bill and feet black. 



Sexes alike. 



Geographical Range. — Argentina and northern Patagonia (Rio Negro). 



Peters found it locally common in western Rio Negro (Huanuluan 

 and Maquinchao). It does not extend into southern Patagonia and was 

 not seen by the Princeton party. 



Hudson "saw this pretty brown and white Tccnioptera in summer and 

 autumn ; but it is not a common bird. They go in small scattered flocks, 

 and frequent level plains abounding in low bushes. In notes, flight, and 

 manner of feeding they resemble most of the other species of Tcenioptera, 

 but are not so wild or active as the last." (P. Z. S. 1872, p. 541.) 



Genus PH^OTRICCUS. 

 Ph^otriccus hudsoni (Sclater). 



Cnipolegus hudsoni Sclater, P. Z. S. 1872, p. 541, pi. xxxi (Rio Negro, 

 Patagonia). 



Description. — Adult male, 284351, Biol. Survey Colin., U. S. Depart- 

 ment of Agriculture, Victorica, Pampa, Argentina, December 27, 1920, 

 Alexander Wetmore. Total length, 5.58 inches; wing, 2.75; culmen, 

 .51; tail, 2.68; tarsus, .80. Entire exposed plumage jet black, with a 

 slight bluish gloss with a concealed silky white patch on each side of the 

 rump, the basal part of rump feathers grayish ; there is also a white band 

 across the inner webs of the remiges, bill plumbeous, feet black. 



Geographical Range. — Patagonia (Rio Negro) and southern Argentina. 



Hudson writes: "This bird makes his appearance late in September in 

 the close thickets bordering on the Rio Negro; he is usually seen perched 

 on the topmost twig of a bush watching for insects, after which he darts 

 with great swiftness. He has one most remarkable habit: suddenly quit- 

 ting his perch he glides two or three times close round it, uttering at the 

 same time a peculiar sharp note. It also frequently utters a sharp, rapid 



