Coelioxys is an insect genus in the family Megachilidae. They're closely related to Leaf-Cutter (Megachile), Mason (Osmia spp.) and Digger Bees (Anthophora spp.); however, they adopt a different lifestyle to the latter genera. These bees are Kleptoparasites. Although they initially forage their resources in the first few days of emergence after development, they will lay their eggs in the nests of other bees; mainly the nests of Leafcutter Bees. Once hatched, their larvae deplete the nests of the eggs and larvae belonging to the nest owner. They'll also clear nests of the pollen and nectar stores.