Two males of the Palaearctic Helophorus grandis were collected in northern Wisconsin, constituting a significant westward extension of its previous range in eastern Ontario, eastern New York, and areas farther east.
Hilsenhoff, William L.
"Occurrence of Helophorus Grandis (Coleoptera: Hydrophilidae) in North-Central Wisconsin,"
The Great Lakes Entomologist: Vol. 23
, Article 12.
Available at: http://scholar.valpo.edu/tgle/vol23/iss3/12