 They are small flies, usually about in length.No true fossils are known, although there are some specimens in Colombian copal, of unknown (but likely relatively recent) age.Species of "Melaloncha" are parasitoids of bees, especially stingless bees (Meliponini), but also introduced European honey bees ("Apis mellifera"), bumblebees ("Bombus"), and halictid bees ("Megalopta").