In its nidification the Bienteveo also departs widely from the, so to speak, traditional habits of its congeners; for whereas most Tyrants make small shallow nests, this species makes a very big elaborate domed structure, and sometimes takes five or six weeks to complete it. It is placed in a tree, without any attempt at concealment, and is about a foot deep and eight or nine inches broad, and composed of a variety of soft materials, chiefly wool. The entrance is placed near the top. Outside, the nest has a very disorderly appearance, as there are always long straws and sometimes rags hanging down; the cavity is deeply lined with feathers, and is the _hottest_ nest I know. The eggs are five, very long, pointed, cream-coloured, and spotted, chiefly at the large end, with chocolate and purple. 159. MYIODYNASTES SOLITARIUS (Vieill.). (SOLITARY TYRANT.) +Myiodynastes solitarius+, _Scl. et Salv. Nomencl._ p. 50; _Durnford, Ibis_, 1877, p. 178, et 1878, p. 60 (Buenos Ayres); _White, P. Z. S._ 1882, p. 607 (Salta); _Barrows, Bull. Nutt. Orn. Cl._ vol. viii. p. 201 (Entrerios). _Description._--Above grey, thickly covered with numerous black shaft-spots; concealed vertical crest yellow; lores and sides of the head black, superciliaries white; wings blackish, primaries slightly edged with rufous, coverts and secondaries margined externally with greyish white; tail blackish, with narrow external margins of ferruginous; below greyish white, with numerous black striations; belly and under wing-coverts tinged with yellowish and but slightly striated; bill brown, feet blackish: whole length 7·5 inches, wing 4·4, tail 3·4. _Hab._ Brazil, Paraguay, Buenos Ayres. Durnford tells us that this species is a summer visitor to the neighbourhood of Buenos Ayres, but not very common. White met with it in the forests of Campo Santo in November; and Barrows obtained specimens among the Paradise-trees in the Plaza at Concepcion, in the same month of the year. 160. HIRUNDINEA BELLICOSA (Vieill.). (WARLIKE TYRANT.) +Hirundinea bellicosa+, _Scl. et Salv. Nomencl._ p. 51; _White, P. Z. S._ 1882, p. 607 (Catamarca). +Hirundinea rupestris+, _Scl. Ibis_, 1869, p. 198, pl. v. fig. 8. _Description._--Above sooty brown; wings blackish, with a large ferruginous red blotch occupying the greater portion of the inner primaries and secondaries; rump and greater part of the tail-feathers ferruginous red; apical portion of tail-feathers blackish: beneath ferruginous red, throat greyish; under wing-coverts and inner webs of wing-feathers, except the tips, similar to the belly, but brighter; bill and feet black: whole length 7·0 inches, wing 4·3, tail 2·2. _Female_ similar. _Hab._ S.E. Brazil, Paraguay, and Northern Argentina.