Bramble Mason Wasp

Ancistrocerus adiabatus · Order: Hymenoptera · Family: Vespidae

No source yet on danger. We have no source yet on whether it bites, stings or damages anything.
Bramble Mason Wasp
Photo: Laura Clark, CC BY

Adults reach about 11 mm in length (≈0.43 in). The species can have several generations per year and has been observed moving between areas.

Source: Wikipedia

Size

Adults grow up to roughly 11 mm long.

Source: Wikipedia

Life cycle

It produces multiple generations each year and has been seen migrating.

Source: Wikipedia

Where it is found in the US

Recorded in 46 of 51 states and DC. Most records: New York, Illinois, Massachusetts, Maryland, Virginia, Michigan, Pennsylvania, Minnesota.

Darker = more records. Counts are museum and citizen-science records, not population size.

Source: GBIF

Status: native in North America; native in Canada; native in United States. Source: iNaturalist

Months it is reported in the US

JFMAMJJASOND

Source: GBIF

More photos

Bramble Mason Wasp photo 3
Photo: wren-falcon, CC BY
Bramble Mason Wasp photo 4
Photo: Bernie Paquette, CC BY
Bramble Mason Wasp photo 5
Photo: Robert Webster, CC BY-SA
Bramble Mason Wasp photo 6
Photo: apocritev, CC BY

Same family (Vespidae)

European HornetEuropean HornetVespa crabroCan stingBald-faced HornetBald-faced HornetDolichovespula maculataCan stingGerman YellowjacketGerman YellowjacketVespula germanicaCan stingEastern YellowjacketEastern YellowjacketVespula maculifronsCan stingYellow-legged HornetYellow-legged HornetVespa velutinaCan stingWestern YellowjacketWestern YellowjacketVespula pensylvanicaCan sting

Sources

  • Wikipedia: https://en.wikipedia.org/wiki/Ancistrocerus_adiabatus

Look it up elsewhere: GBIF · iNaturalist · BugGuide · Wikipedia

Text written 2026-10-22 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-22.

How this page works

This is one bug's fact sheet. The colored box at the top says whether it is dangerous. Sections below cover how to recognize it, whether it is a pest, and how to deal with it. The US map shows which states have records; tap a state to see other bugs there.

Every fact on Bug FAQ comes from a named source (university extension sites, government agencies, GBIF, iNaturalist, Wikipedia). The source is linked next to each section. If we have no source for something, we leave it out.