Geographically variable antwren. Males are gray with a clean black throat patch and white wing spots; females are browner with cream wing spots and black-and-white mottling on the throat. In some populations, both sexes have a reddish patch on the back. Occupies dense viny habitats and forages in the under- and midstory; in areas with bamboo, often largely restricted to bamboo patches. Song is a quick descending series of high, sharp notes.