The Sombre Hummingbird is a large, dull hummingbird of eastern Brazil. It has a rather heavy, slightly decurved black bill, rather broad wings, and a large tail, features which have justified placement in the genus Campylopterus (sabrewings) in the past. It is dull iridescent green above and dusky below, with a very small white postocular spot. It inhabits forest edge and understory, where it feeds on nectar and aerial arthropods. Its nest is a cup of plant material placed on a horizontal branch.