Yellow-breasted Flycatcher is split into two species. These two species differ vocally (Boesman 2016g); are moderately divergent genetically (Almeida 2017, Harvey et al. 2020); and there is evidence of parapatry or sympatry in the Madeira-Tapajos interfluvium in central Brazil (Almeida 2017). Therefore the polytypic group Yellow-breasted Flycatcher (Olive-faced) Tolmomyias flaviventris [viridiceps Group] becomes Olive-faced Flycatcher Tolmomyias viridiceps, with subspecies viridiceps, zimmeri, and subsimilis; and the polytypic group Yellow-breasted Flycatcher (Ochre-lored) Tolmomyias flaviventris [flaviventris Group] becomes Ochre-lored Flycatcher Tolmomyias flaviventris, with subspecies aurulentus, dissors, and flaviventris.