Tiny flycatcher with a slender tail not usually held cocked. Olive above and on the breast with a yellow throat and belly. The face is pale yellow with a broad dark crescent behind the eye and a yellow eyebrow. Found in the lower and middle levels of lowland humid forests and borders, where it forages very actively, usually in association with mixed-species flocks. Normally found at lower elevations than Oustalet's Tyrannulet. The song is a series of high-pitched frenetic whistles.