 Most adults are predatory on other small animals, though some may scavenge or act as kleptoparasites of spiders or other predators.An expanded concept of the family (Dolichopodidae "sensu lato") includes the subfamilies Parathalassiinae and Microphorinae.The latter of these was formerly placed in the Empididae, and was at one time considered a separate family (Microphoridae).