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Lasius emarginatus is a species of Hymenoptera in the family ants. They visit flowers of swamp milkweed, butterfly milkweed, St. Anthony's turnip, and Taraxacum tenejapense. They are diurnal.

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EOL has data for 10 attributes, including:

Known occurrences, collected specimens and observations of Lasius emarginatus (Olivier 1792). View this species on GBIF