Robber Fly

Description:

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

Habitat:

Perched on a rock on the side of the trail where the land rises on the side of the spillway.