Habitat
Understorey and middle storey forest edges in "terra firme" forest (with no flooding), transitional forest and "várzea" (seasonally flooded forest), as well as some tall secondary woodland. From sea-level - 1,400 m.
Considered by some authors to be a subspecies of Guianan Warbling-Antbird (Hypocnemis cantator).
The following 2 subspecies are recognised:
collinsi Cherrie, 1916 - Southern Peru (south-eastern Ucayali, eastern Cuzco, Madre de Dios, Puno), extreme south-western Amazonian Brazil (Acre) and west-central Bolivia (Pando, La Paz, western Beni, Cochabamba).
subflava Cabanis, 1873 - Andean foothills in east-central Peru (Huánuco south to Cuzco). Considered by some authors to be a distinct species, Yellow-breasted Antwarbler (Hypocnemis subflava).