The larvae, like those of other Asiloidea, have an entomophagous diet and they live as predators. They are generally found on dry, sandy soils and dry litter. Larvae also are located in other substrates such as decomposing organic matter and under the bark of trees. Among the prey are the larvae and pupae of Diptera, Coleoptera, and Lepidoptera. The observation of the behaviour of known forms highlights voracious feeding and agile movements. When exposed to light, the larvae of the Therevidae dig back into the substrate with rapid movements.