Sicus ferrugineus, is a member of the Canopidae, a sub family of the large order of insects known as Diptera or True Flies. Insects within this group are often referred to as Thick-headed flies because their heads are wider than their thorax. The adults feed on nectar from flowers and the females lay eggs in bees and wasps in which the larvae then feed, eventually causing death to their host.

No, never seen these strange looking flies. They have strange heads indeed.