Darting bee fly?

The hermitage was wonderfully invaded by a creature such as this. I originally googled the image since they are too quick and don’t stay in one place very long. I finally got this shot on some gargantuan onion tops. They hover in one place and then, in a nanosecond, they are hovering about two feet over, surveying for… nector I guess. I don’t think they sting. Fun to have around. They are a bit loud, and grab your attention if they fly right in front of  your face, hovering there, making a racket.