((harrison twp. mi usa) ) A blackish fly with blue markings that resembles a moth to me
This is a fly – a tiger bee fly to be more precise. This is a large bee fly with a distinctive wing pattern. They are typically found around open areas and meadows.
They are not sure what the flies eat, but the larvae feed on carpenter bees. So for most folks that means it is a good bug! Tho carpenter bees do help with pollination.