OR ROBBER FLIES, described by Eaton & Kaufman(2006), being to other insects what falcons are to other birds. That is, swift predators on the wing. They can all generally be recognized by the usually "bearded face" and the concave top of their head between their eyes. Many act like flycatchers, perching on logs, leaves, twigs, or the ground, cocking their heads at insects passing overhead, and dashing out to apprehend a victim.
I found this guy on a low leaf while looking for Bumblebee Moths (H. diffinis).
I left.
It cocked its head at me.
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