It is to some extent migratory, and usually goes in flocks of a dozen or twenty birds, and frequents open situations where there are bushes and trees, also plains covered with giant grasses. They are more social in their habits than _T. coronata_, but in other respects closely resemble it, and are exceedingly active lively birds, and when the flock is on the wing continually pursue each other in a playful manner. Mr. Barrows observed them in autumn on the Pigué (southern pampas) preparing for their migration. "Late in March," he says, "we found them in large scattered flocks, which collected in one place toward evening, and went through a series of aerial evolutions accompanied with vocal exercises of a varied and entertaining kind, lasting half an hour or more. "I presume this was in preparation for their northward (or westward?) migration, as we did not see them again after leaving this spot." 115. TÆNIOPTERA IRUPERO (Vieill.). (WIDOW TYRANT.) +Tænioptera irupero+, _Scl. et Salv. P. Z. S._ 1868, p. 141 (Buenos Ayres); _iid. Nomencl._ p. 42; _White, P. Z. S._ 1882, p. 603 (Catamarca, Misiones); _Döring, Exp. al Rio Negro, Zool._ p. 42 (R. Colorado); _Barrows, Bull. Nutt. Orn. Cl._ vol. viii. p. 139 (Entrerios). +Tænioptera mœsta+, _Burm. La-Plata Reise_, ii. p. 460. _Description._--Above and beneath pure white; wings with the primaries black except the innermost, which are white at their bases and tipped with black, and secondaries which have narrow black shafts; broad end of the tail black; bill and feet black; two outer primaries acuminated: whole length 7·0 inches, wing 4·3, tail 3·2. _Female_ similar. _Hab._ Paraguay, Uruguay, Argentine Republic, and Bolivia. This pretty species is found throughout the Argentine country, and is well known to the natives, and usually called _Viudita_ (Little Widow), on account of its mourning colours. It is also sometimes curiously named _Anjelito de las Animas_, from a superstitious notion due to the intense whiteness of its plumage and to its supposed habit of frequenting graveyards. In both sexes the entire plumage is snowy white, except the primaries and the tip of the tail, which are black. In habits it is more sedentary than other _Tæniopteræ_, and obtains its food chiefly by patiently watching the surface of the ground for its insect prey. Its marvellously white plumage, and the habit of sitting motionless on the summit of a bush or tree, make it a most conspicuous object, so that it is strange to find such a bird existing in districts which abound in raptorial species; for Hawks, I have frequently noticed, will always single out a white or conspicuously coloured bird for pursuit, and though the Little Widow, like the other members of its genus, is swift and strong of wing, the feeble and the young must often fall victims to their shining white plumage.