A female specimen of Perithous (Hybomischos) septemcinctorius (Thunberg) was collected from a spider web in a garage in Ann Arbor, Michigan, on May 4, 1972. The specimen was dead but intact and had evidently been trapped the previous fall, although late enough that it was not fed on by a resident spider.
Torgersen, Torolf B.
"A Perithous (Hymenoptera: Ichneumonidae) Introduced from Europe,"
The Great Lakes Entomologist: Vol. 5
, Article 9.
Available at: https://scholar.valpo.edu/tgle/vol5/iss3/9