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Hello Bruce,

I think this is a species of Tropidia, maybe Tropidia quadrata but there are seven other species in North America. There are not many genera with such an apical flange on the hind femur. The (imported) European Merodon equestris has it, but mimic bumblebees.
Resembling Tropidia are some Cynorhinella, but these have a face that projects anteroventrally and the face itself is less swollen and has a very distinct median knob.