Smith, Brian Tilston, et al. "Species delimitation and biogeography of the gnatcatchers and gnatwrens (Aves: Polioptilidae)." Molecular Phylogenetics and Evolution 126 (2018): 45-57.

@camilojotage do you have any thoughts on this split? There don't appear to be any genetic samples from close to Medellín, so it's hard to say whether observations there should go to P. plumbea sensu stricto or to P. bilineata. The way the atlases are set up right now, they will go up to genus.