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Ectemnius rufifemur is a species of Hymenoptera in the family crabronid wasps. They visit flowers of Pendleton's eryngo, Suisun Marsh aster, and Ruth's milkweed. They are diurnal.

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EOL has data for 11 attributes, including:

Known occurrences, collected specimens and observations of Ectemnius rufifemur (Packard 1866). View this species on GBIF