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Tiny black fly with a dark red thorax. Dark wings with slightly blue/purple iridescence. Males have larger heads than the females. The first picture is a female being swarmed by males (lower center of the photo). Most of them were males. No common name.
Cedar Creek County Park, NY. Feeding on Goldenrod.
I had thought they were a species of mosquito at first because of how small they are. They seem to have a habit of flying in your face for no apparent reason. Thank goodness they don't bite.