Like other Rhegmatorhina, the White-breasted Antbird occupies a rather circumscribed range, in this case in central Amazonian Brazil between the Rio Madeira and the Rio Tapajós, and south as far as the state of Rondônia. It is a beautiful antbird; males have brown upperparts, a black crown and nape, a white face, throat, and breast, with grayish underparts, while females have pale brown underparts vermiculated with black, a brown crown, and brown and black vermiculated mantle and wing coverts. Both sexes possess an obvious greenish-yellow orbital skin. The White-breasted Antbird is like congenerics in feeding low above the ground on insects and other arthropods fleeing from army ant swarms. It is locally fairly common, but the species was formerly considered Near Threatened on the basis of its overall small range and perceived rarity.