Rio de Janeiro Antbird

The Rio de Janeiro antbird is 13 to 14 cm (5.1 to 5.5 in) long. Adult males are mostly gray, with darker upperparts and paler underparts. They have a white patch between their scapulars, a hidden white patch under the scapulars, and white tips on their wing coverts. Their tail is blackish gray with narrow white tips on the feathers. Their wings have a brown tinge. Females have olive-brown upperparts with a whitish area around their eye, a minimal white interscapular patch, and a grayer rump. Their wings are darker than their back. Their tail is pale olivaceous brown. Voice: The male Rio de Janeiro antbird's song is "2–4 rapidly delivered, abrupt, barely audible notes followed by longer...harsh note". Females simultaneously sing irregularly repeated "notes sounding like 'cup' ". The species' calls include "a rapidly delivered series of short notes, first note more emphatic, and frequency-modulated versions of loudsong notes".