The amethyst woodstar ("Calliphlox amethystina") is a species of hummingbird.Tiny, short-billed hummingbird of forests, forest edges, and savanna woodlands. Both sexes are green on the back with a white band across the rump, but males have glossy pink throat and a deeply forked tail. Females have a white throat, a short tail, and cinnamon flanks and undertail.