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Ancistrocerus unifasciatus is a species of Hymenoptera in the family Vespidae. They visit flowers of wild parsnip, bishop's goutweed, eastern greenviolet, and common rue. They are diurnal. Individuals can grow to 10.5 mm.

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EOL has data for 15 attributes, including:

Known occurrences, collected specimens and observations of Ancistrocerus unifasciatus (de Saussure 1853). View this species on GBIF