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Ancistrocerus adiabatus
Bramble Mason Wasp
Ancistrocerus adiabatus is a small potter wasp in the subfamily Eumeninae, commonly known as the Bramble Mason Wasp. Adults reach approximately 11 mm in length. This species is notable as the first documented case of large-scale migration in eumenine wasps, with 44,000–68,000 individuals observed moving through a migration corridor in southwestern Ontario in less than an hour. It is multivoltine, producing multiple generations per year.