_Description._--Above sandy brown, lores and superciliaries white; wings black, greater coverts and outer secondaries edged with whitish, lesser coverts like the back; tail black, outer web of the outer tail-feathers and tips of others white; below white, with black striations on the sides of the throat and on the breast; flanks, under wing-coverts, and inner webs of the primaries deep rufous; two outer primaries acuminated: whole length 7·5 inches, wing 4·7, tail 3·2. _Female_ rather paler, throat and breast washed with ochraceous, and outer primaries not acuminated. _Hab._ Interior of Argentine Republic and Patagonia. I have met with this bird at all seasons of the year in Patagonia on the Rio Negro, and think it probable that it has no migration. It is seen in flocks of twenty or thirty individuals, and in its lively actions when on the wing, and in its habit of perching on a bush or elevation of some kind, from which it pounces down on an insect seen on the ground, it resembles other _Tæniopteræ_; but it runs about on the ground a great deal, and in this respect is more like a _Myiotheretes_ or _Muscisaxicola_. In its colour it also diverges widely from the typical _Tæniopteras_ in their black and white Dominican plumage. The whole upper parts are light chestnut, with a white mark on the side of the head; wings and tail dark, tipped with pale rufous; throat, breast, and belly whitish rufous, with dark lines on throat and bosom. The chestnut hue in the female is paler and mixed with grey. 118. OCHTHŒCA LEUCOPHRYS (d'Orb. et Lafr.). (WHITE-BROWED TYRANT.) +Ochthœca leucophrys+, _Scl. et Salv. Nomencl._ p. 42; _White, P. Z. S._ 1882, p. 603 (Catamarca). _Description._--Above dark cinereous, rump rufescent; wings black, cross-bands on wing-coverts and edges of outer secondaries rufous; tail blackish, outer web of external rectrix white; beneath pale cinereous; lower belly, crissum, and under wing-coverts white; bill and feet black: whole length 5·2 inches, wing 3·0, tail 2·7. _Hab._ Bolivia and Northern Argentina. A single specimen of this bird was obtained by White at Fuerte de Andalgala, Catamarca, in September 1880, during a snow-storm. 119. SAYORNIS CINERACEA (Lafr.). (ASHY TYRANT.) +Sayornis cineracea+, _Scl. et Salv. Nomencl._ p. 43. +Aulanax latirostris+, _Cab. J. f. O._ 1879, p. 335 (Tucuman). _Description._--Above dark cinereous; head sooty black; wings and tail blackish, outer margins of the wing-coverts and secondaries and outer web of the external tail-feather white; below sooty black, middle of belly and under wing-coverts white, flanks and crissum dark cinereous; bill and feet black: whole length 9·5 inches, wing 3·4, tail 3·1. _Female_ similar. _Hab._ Colombia, Venezuela, Ecuador, Peru, Bolivia, and N. Argentina.