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Osmia nigrobarbata is a species of Hymenoptera in the family Megachilidae. They visit flowers of Penstemon lanceolatus, Ackerman's milkvetch, Guadalupe Island lupine, and Wassuk Range beardtongue.

EOL has data for 6 attributes, including:

Known occurrences, collected specimens and observations of Osmia nigrobarbata Cockerell 1916. View this species on GBIF