Small, long-tailed antwren. Males resemble many other antwrens, mostly gray with a black cap, a long white eyebrow, and a black eye-stripe. Females have a streaked crown and a buffy forehead and underparts. Inhabits the middle levels and canopy of coastal forest (restinga), where it forages singly or accompanying mixed-species flocks. Sings a series of 4-7 notes that accelerate gradually and then decelerate slightly at the end.