Remarkable size for a wren (20.5 cm.). Bill
somewhat long and slightly curved, bone color.
A clear eyebrow. Dark brown back slightly stained. Underparts whitish with
slight mottling on flanks. Tail comparatively longer than other wren. Undertail
barred. Powerful singing, usually duet. It is distributed by the east of Chaco,
Formosa and the north of Misiones. It inhabits palm groves and open areas.