A rotting American elm log containing adults of Valgus hemipterus (L.) was discovered on 6 May 1980, at the Rose Lake Wildlife Experiment Station, Shiawassee County, Michigan. This appears to be the first record of this European species in North America. Larvae were collected in the summer, and pupae and teneral adults in the early fall suggesting a univoltine life cycle with the adults overwintering.
Mahar, Joseph M. and Oemke, Mark P.
"A North American Record for Valgus Hemipterus (Coleoptera: Scarabaeidae) and Information on its Life Cycle,"
The Great Lakes Entomologist: Vol. 14
, Article 2.
Available at: https://scholar.valpo.edu/tgle/vol14/iss2/2