Mycterus youngi was described from Wisconsin and “L.S” (presumed to indicate along Lake Superior). All but one of the specimens in the type series were collected between 1947 and 1949. Herein, three females of M. youngi are reported from Michigan, between 1910 and 1940. A discussion of possible implications of the few, and largely old collection dates is provided.
Young, Daniel K.
"New state record and range extension for Mycterus youngi Pollock (Coleoptera: Mycteridae) – but is it really rare?,"
The Great Lakes Entomologist, vol 52
Available at: https://scholar.valpo.edu/tgle/vol52/iss2/13