Members of the Mydas fly family tend to be large (for true flies), and many species resemble wasps (although they are harmless). Many species are black, dark, or tan, with red, orange, or yellow bands. Like all true flies, they only have only one pair of wings. Unlike most flies, they have clubbed antennae (rather like the antennae of butterflies). Each foot has two pads, and there are distinct aspects to the wing venation as well.
Similar species: Robber flies (family Asilidae), a closely allied group, look similar (for they too are large bee and wasp mimics), but they lack the clubbed antennae, and there are differences in wing venation, as well.There are many different insects that mimic bees and wasps, and there are many different bees and wasps for them to mimic! Keep in mind that members of the fly family have only two wings (one pair), while other insects (including the bee and wasp family) have four wings (two pairs).