Small antwren found in the canopy of foothill forests of the eastern Andes in central Peru. Note the black cap, striped face, white wingbars, and lack of rufous in the wing. The slight yellowish tinge on the underparts for which the species is named is often hard to see in the field. Female has white spotting in the crown. While several other antwrens in Peru share similar plumage features, none of them occur in the range of this species. Song starts with a couple of peeping notes followed by a fast descending trill.