Robber Fly

Medium-sized to large predatory flies, often perch in exposed location and make short flies after prey. Typical family characteristics:
top of head depressed between eyes, with three ocelli in the depression
body from very hairy to nearly bare
body typically elongated, with tapered abdomen
some are bee/wasp mimics
face usually "bearded", with prominent mystax
mouthparts modified to inject prey with saliva, similar in both sexes (unlike in blood-sucking flies, such as Tabanidae)
antennae three-segmented, third segment elongate and often with terminal style