The last photo, taken through a microscope, shows several diagnostic features of this species according Skevington et al. (2019, Field Guide to the Flower Flies of Northeastern North America), including short & erect hairs on the mesonutum, orange spots on T2 & T3, golden hairs on T4, the presence of hairs on the alula, and the pollinose katepisternum.
BugGuide ID:
Genus Eumerus
http://bugguide.net/node/view/1394626/bgimage
Found on ninebark shrub in native landscape planting. https://bugguide.net/node/view/1818607
collected in Madison County, Illinois
Very pregnant mantis photo by Pomona. Sitting on a garlic chives that are very attractive to pollinators in bloom.