Small, strikingly-plumaged antbird with a long tail and a very restricted range. Inhabits the understory of low stature forests, forest edges, regenerating forests, and abandoned plantations where it is very active and occasionally joins mixed-species flocks. Two subspecies; serrana males are rufous-brown above and interposita subspecies are dark gray above, but both are black below with a bold white eyebrow and white wing spots. In both subspecies females are pale buff below.