". . . this species nests in virtually all kind of cavities, not only small holes in old walls.
In its European homeland, this is rather a late season species, most often encountered between mid-august and early october. Female hunts for virtually all kinds of small hairless caterpillars, even those of some butterflies, which is rare among Eumeninae (most other Ancistrocerus hunt for Gelechiid, Tortricid or Pyralid moths caterpillars)." Richard Vernier
Introduced from Europe before 1916.