_Description._--Above sandy brown, striated with black; head nearly black; lores and superciliaries white; wings and tail blackish with slight brownish edgings; below pale sandy buff, more brownish on the sides of the neck and flanks; bill and feet black: whole length 3·7 inches, wing 1·7; tail, ext. rectr. 1·3, med. 1·9. _Hab._ S.E. Brazil. An example of this species is stated by White to have been obtained by him at Itapua, Misiones, in July 1881, but there was possibly an error in its identification. 144. STIGMATURA BUDYTOIDES (d'Orb. et Lafr.). (WAGTAIL TYRANT.) +Stigmatura budytoides+, _Scl. et Salv. Nomencl._ p. 46; _Salvin, Ibis_, 1880, p. 357 (Tucuman, Salta). _Description._--Above greyish olive; lores and short superciliary streak yellowish; wings blackish brown, tips of wing-coverts and outer margins of secondaries white; tail blackish, all the lateral rectrices crossed by a broad, white, median and second terminal band; under surface pale yellow; bill and feet black: whole length 5·0 inches, wing 2·1, tail 2·5. _Hab._ Bolivia, Peru, Interior of Brazil, Northern La Plata. Examples of this species were obtained by Durnford in Tucuman and Salta. 145. STIGMATURA FLAVO-CINEREA (Burm.). (LONG-TAILED TYRANT.) +Phylloscartes flavo-cinereus+, _Burm. La-Plata Reise_, ii. 455 (Mendoza); _Döring, Exp. al Rio Negro, Zool._ p. 42 (R. Negro, R. Colorado). +Stigmatura flavo-cinerea+, _Hudson, P. Z. S._ 1872, p. 542 (Rio Negro); _Scl. et Salv. Nomencl._ p. 46; _White, P. Z. S._ 1882, p. 606 (Catamarca). _Description._--Above greyish olive, lores and superciliary stripe whitish; wings blackish, with whitish edgings to the coverts and outer secondaries; tail blackish; outer web of the external rectrix and broad tips of the four external pairs white; beneath pale yellow; bill and feet black: whole length 5·8 inches, wing 2·3, tail 3·0. _Female_ similar. _Hab._ Argentine Republic, including N. Patagonia. This little bird inhabits the Mendoza and Patagonian districts, and does not appear to be migratory, for on the Rio Negro I found it at all seasons. It is slender in form, with a long tail, its total length being six inches. The sexes are alike in colour; the upper parts are yellowish grey, breast and belly light yellow. They are found living in pairs, all the year round, in thorn bushes, and are scarcely ever seen to rest, but hop incessantly from twig to twig, in a delicate, leisurely manner, seeking on the leaves for the minute caterpillars and other insects on which they live. While thus engaged they utter a variety of little chirping and twittering notes, as if conversing together, and occasionally the two birds unite their voices in a shrill, impetuous song. 146. SERPOPHAGA SUBCRISTATA (Vieill.). (SMALL-CRESTED TYRANT.)