We examined variation among populations of the complex assemblage of hummingbirds presently considered to constitute Amazilia viridifreons (Elliott, 1871), of Guerrero, Oaxaca, and Chiapas. A previous author had correctly suggested recognition of most Oaxaca populations as a full species, A. wagneri Phillips, 1964. We found that the Chiapas populations are also recognizable as a distinct taxon
because no name had previously been applied to these populations, we name it as a new subspecies, A. viridifreons villadai. Populations recently described as A. viridifreons rowlei are actually referable to A. wagneri
moreover, that subspecies is not valid as an entity distinct freom the remainder of A.wagneri.