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Delia nigrescens is a species of flies in the family root-maggot flies. They visit flowers of Health Speedwell, Mouse-ear-hawkweed, Common Rock-rose, and common buttercup. They are diurnal.

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EOL has data for 8 attributes, including:

Known occurrences, collected specimens and observations of Delia nigrescens (Rondani 1877). View this species on GBIF