Different kinda fly?

From the front yard. I don't know what type of fly this is, but there were a bunch of them on a bush at the end of my driveway. When startled they would fly straight up and hover a few seconds and then land agian. I never could get a good picture in when they were in the air. Also some of them were black and white.

Clear skies,

Ernie

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I don't know their name either; we used to call them 'sweat bees' at football practice back in the day...