Habitat selection by Passaloecus spp. based upon tree species used as stations for artificial nesting sites were studied. Data suggest that Passaloecus areolatus preferred Juglans and that P. cuspidatus preferred Pinus.
Fricke, John M.
"Influence of Tree Species on Frequency of Trap-Nest Use by Passaloecus Species (Hymenoptera: Sphecidae),"
The Great Lakes Entomologist, vol 25
Available at: https://scholar.valpo.edu/tgle/vol25/iss1/8