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Prionyx atratus is a species of Hymenoptera in the family sphecid wasps. They visit flowers of Santa Cruz clover, Pendleton's eryngo, western goldentop, and gooseneck yellow loosestrife. They are diurnal.

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EOL has data for 11 attributes, including:

Known occurrences, collected specimens and observations of Prionyx atratus (Lepeletier de Saint Fargeau 1845). View this species on GBIF