Five species of Passaloecus used trap-nests in a study area in southern Michigan. Significant differences in trap-nest bore diameter selection were noted among P. annulatus, P. areolatus, P. cuspidatus, and P. monilicornis. P. annulatus and P. areolatus selected bore diameters 1.6 to 2.4 mm, P. cuspidatus used bore diameters of 2.0 to 6.4 mm, and P. monilicornis selected diameters of 1.6 to 3.6 mm.
Fricke, John M.
"Trap-Nest Bore Diameter Preferences Among Sympatric Passaloecus Spp. (Hymenoptera: Sphecidae),"
The Great Lakes Entomologist: Vol. 24
, Article 10.
Available at: http://scholar.valpo.edu/tgle/vol24/iss2/10