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Hylaeus mesillae is a species of bees & apoid Wasps in the family plasterer bees. They visit flowers of black medick, Virginia strawberry, Ruth's milkweed, and smooth baccharis.

EOL has data for 6 attributes, including:

Known occurrences, collected specimens and observations of Hylaeus mesillae (Cockerell 1896). View this species on GBIF