For terms see Morphology of Diptera Wing length 8·5-11·25 mm.

Males tergite 2 large yellow spotsreach the hind margin over their full width.

[2] See references for determination [3][4][5][6] Palearctic Fennoscandia South to North France.

Nearctic from Alaska to Nova Scotia and South to Utah.

[9] Flowers visited include white umbellifers, Calluna vulgaris, Cirsium, Convolvulus, Crataegus, Echium, Euphorbia, Limonium, Lycopus, Mentha aquatica, Menyanthes, Narthecium, Parnassia palustris, Plantago, Pulicaria, Rosa, Rubus, Salix repens, Salix, Senecio, Sorbus, Succisa, Taraxacum, Valeriana.