Formerly treated as Vulnerable under IUCN criteria, the Brazilian endemic Narrow-billed Antwren is currently categorized as Near Threatened, and is restricted to a comparatively small number of localities in the states of Bahia and Minas Gerais, although in at least some areas the species remains reasonably common. It typically inhabits tropical deciduous and semi-deciduous forest, especially the interior of mata-de-cipó with many vine tangles and patches of terrestrial bromeliads, where the species forages for invertebrates singly or in pairs, and sometimes with mixed-species flocks. The Narrow-billed Antwren is relatively long-tailed. Males are slate-gray, with two white wingbars and narrow white tips to the outer tail feathers, a large black bib, and silvery-white flanks. Females, in contrast, are olive-brown above with two indistinct, buff wingbars, and ochraceous underparts, with limited white on the flanks.