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Osmia atrocyanea is a species of Hymenoptera in the family Megachilidae. They visit flowers of rose clover, farewell to spring, Narrow-Leaf Fireweed, and Hairy Cat's-Ear.

EOL has data for 7 attributes, including:

Known occurrences, collected specimens and observations of Osmia atrocyanea Cockerell 1897. View this species on GBIF