In a previous paper (O'Brien 1989) I listed a single record of G/enostielia pietjfrons (Smith) from Michigan. The female specimen was from the E.S. George Reserve in Livingston Co., and I stated that it was the only record from the George Reserve.
O'Brien, Mark F.
"A Further Note on Glenosticta Pictifrons (Hymenoptera: Sphecidae) in Michigan,"
The Great Lakes Entomologist, vol 23
Available at: https://scholar.valpo.edu/tgle/vol23/iss4/9