Allium ursinum
The habitat is woodland and forest clearings, agricultural land and forest clearings. Also montane and subalpine pasture. Flowers visited include white umbellifers, composites "Ajuga", "Allium ursinum", "Caltha", "Crataegus", "Matricaria", "Potentilla", "Prunus spinosa", "Ranunculus", "Sorbus", "Stellaria".The flight period is April to June, and into July at higher altitudes.