The male Yellow-rumped Antwren has a grey head and breast, a black cap, and yellow underparts and rump. Females are duller and lack the black cap. The species forages in the canopy of humid Andean forests, often in mixed-species flocks.
Males have a grey head and breast, a conspicuous black cap, yellow underparts and rump, and black wing coverts with yellow bars. Females are duller, with yellow-olive wing coverts and no black cap.
It forages in the canopy of humid montane forest, usually as part of mixed-species flocks.
An extinction-risk assessment has not been added yet.