Appearance
The wingspan is about 65–100 mm. The forewings are gray to tan, crossed by irregular dark bands. Adults are on wing from June to August.Naming
Sthenopis argenteomaculatus Harris, 1841Hepialus argenteomaculatus Harris, 1841
Sthenopis argentata Packard, 1865
Cossus alni Kellicott, 1885
Hepialus los Strecker, 1893
Sthenopis perdita Dyar, 1893
Distribution
Canada: Labrador, Manitoba, New Brunswick, Nova Scotia, Ontario, Quebec, SaskatchewanUnited States: Indiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, New Hampshire, New York, Ohio, Pennsylvania, West Virginia, Wisconsin
Food
Food plants for this species include ''Alnus'', ''Betula'', and ''Salix''. They bore in roots of their host plant that are partially submerged in water. The life cycle takes two years.References:
Some text fragments are auto parsed from Wikipedia.
https://mothphotographersgroup.msstate.edu/large_map.php?hodges=18https://www.butterfliesandmoths.org/species/Sthenopis-argenteomaculatus