Found in the Andes from northern Venezuela south and west, sometimes discontinuously, to northwest Bolivia, like all Drymophila antbirds, the Long-tailed Antbird is a bamboo specialist. In this case, the Long-tailed Antbird prefers the understory and midstory of a variety of different bamboo species, including introduced species, within montane evergreen forest at 750–2700 m, but most typically at 1200–2500 m. It is also readily found in second growth and is usually fairly common. Four subspecies are recognized, although their plumage is generally rather similar. The Long-tailed Antbird’s plumage is typical of the genus, with the female being a duller version of the male, as always. Its foraging ecology is similar to that of the other members of the genus, and like most of its relatives the species’ breeding biology is practically unknown.