Ptyonura rufivertex, Burm. La-Plata Reise, ii. p. 461 (Mendoza).
Description.—Above clear cinereous; lores and short superciliaries whitish; well-defined nape-patch bright rufous; wings brownish; upper tail-coverts and tail black, outer margin of outer rectrix white: below clear cinereous white, brighter on lower belly, crissum, and under wing-coverts; bill and feet black: whole length 6·5 inches, wing 4·0, tail 2·8. Female similar.
Hab. Peru, Bolivia, Chili, and Western Argentina.
[135.] MUSCISAXICOLA MACULIROSTRIS, d’Orb. et Lafr.
(SPOT-BILLED TYRANT.)
Muscisaxicola maculirostris, Scl. et Salv. Nomencl. p. 44; Durnford, Ibis, 1878, p. 395 (Centr. Patagonia). Ptyonura maculirostris, Burm. La-Plata Reise, ii. p. 462 (Mendoza).
Description.—Above greyish brown, lores and slight superciliaries whitish; tail-coverts and tail black, the outer web of the outer rectrix white; below pale greyish white, whiter on the belly and crissum; bill black, with the base of the lower mandible yellowish; feet black: whole length 5·5 inches, wing 3·4, tail 2·4. Female similar.
Hab. Chili, Patagonia, Bolivia, Peru, and Western Ecuador.
Prof. Burmeister met with this species near Mendoza, in the mouths of the large torrents above the city. Durnford found it near the river Sengalen in Central Patagonia in December 1877.