It means with a cup on the head (tuft or down). It is the name of a genus of hummingbirds that are characterized by having a cup, bun or plume on the head. They belong to the Trochilidae family. They are only found in southern Brazil.
Cefalep : Genus of tenuirropstros birds of the trochilido family, whose males have on their heads a bow finished in tip with a single feather.