Asilus sericeus, commonly known as the silky robber fly, is a species of predatory insect belonging to the family Asilidae. It is characterized by its robust body, reaching a length of about 2 centimeters, and its striking metallic green or blue coloration. Silky robber flies are known for their strong flying abilities and predatory behavior, preying on a variety of insects including bees, wasps, and other flies.