A new species of meniscus midge is reported from western Michigan. Adults of Dixella fraxina Taber appear in spring in tussock sedge, Carex stricta Lamarck, understory of black ash, Fraxinus nigra Marshall, swamp. No new species of this genus have been discovered in the United States in the last 40 years. Dark wing coloration suggests a close relationship to Dixella marginata (Loew) but characters in both sexes distinguish this fly from that species and from its other 18 congeners occurring in the United States, half of which occur in the western and southwestern states.