The Slate-throated Gnatcatcher is distributed from eastern Panama to northwest Ecuador, and is generally considered to be rather uncommon and local, although it is not considered threatened, in part due to its wide range. It is a generally dark gnatcatcher, over both the under- and upperparts, with pale lores and a black tail. The sexes are basically alike, which is typical of the Guianan Gnatcatcher (Polioptila guianensis) group of species, to which the Slate-throated Gnatcatcher is assumed to be sister. Found in the subcanopy or canopy of taller forests, mainly at elevations below 750 m, the Slate-throated Gnatcatcher is usually found alone or in pairs, and these regularly join mixed-species foraging flocks. Very little is known concerning its natural history, especially the species’ breeding behavior.