The Little Widow is a solitary bird, and not nearly so lively and playful in manner as _T. coronata_ and _T. dominicana_, its surpassing whiteness being its most interesting feature. Its nesting-habits are unlike those of other _Tæniopteræ_, for it breeds only in holes, usually in the bole or branch of a tree; but sometimes it takes possession of the oven of _Furnarius rufus_ to lay in. The nest is composed chiefly of feathers and contains four eggs, creamy white, with a few very minute red spots, irregularly distributed. Mr. Dalgleish says, "Some eggs have only two or three spots, none have more than eight or ten." Mr. Barrows says:--"The adults have several of the primaries remarkably attenuated. Young birds appear to acquire these attenuate primaries only after a complete moult. But I took one specimen which showed one or more primaries with tips of ordinary shape but with a line apparently _worn_ into the vane of the inner web, so as to mark out distinctly the attenuate tip, and it seemed as if a little more wearing would cut out a piece which would leave the primary as in the old bird." 116. TÆNIOPTERA MURINA (d'Orb. et Lafr.). (MOUSE-BROWN TYRANT.) +Tænioptera murina+, _Hudson, P. Z. S._ 1872, p. 541 (Rio Negro); _Scl. et Salv. Nomencl._ p. 42; _White, P. Z. S._ 1883, p. 38 (Cordova). +Pyrope murina+, _Cab. Journ. f. Orn._ 1878, p. 196 (Cordova). _Description._--Above sandy cinereous, whitish round the eyes; wings and tail blackish with whitish edgings; below much paler, throat whitish with slight black striations; belly and crissum tinged with ochraceous; under wing-coverts and flanks pale ochraceous; bill horn-colour; feet black; two outer primaries acuminated: whole length 7·0 inches, wing 4·0, tail 2·9. _Female_ similar, but outer primaries normal. _Hab._ Western Argentina and North Patagonia. This species inhabits the Mendoza district, and migrates south in spring. I met with it on the Rio Negro, in Patagonia, where it made its appearance in October. The sexes are alike. The entire upper plumage is dull grey with a pale rufous tinge; throat, breast, and belly pale buff tinged with grey. It is a solitary bird, restless in manner, has a swift flight, and sits on a stalk or other slight elevation, from which it darts down to seize any insect it spies on the ground. Its only language is a very low whistling note. 117. TÆNIOPTERA RUBETRA (Burm.). (CHAT-LIKE TYRANT.) [Plate VII.] [Illustration: TÆNIOPTERA RUBETRA.] +Tænioptera rubetra+, _Burm. La-Plata Reise_, ii. p. 461 (Mendoza); _Hudson, P. Z. S._ 1872, p. 541 (Rio Negro); _Scl. et Salv. Nomencl._ p. 42; _Durnford, Ibis_, 1877, p. 34, et 1878, p. 394 (Patagonia).