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Alan Stubbs' key to the British species separates luniger and corollae by the amount of yellow at the margins of the abdomen - in corollae the yellow lunules continue all the way to the lateral margins of the abdomen, with at least 50% of each segment edge yellow, in luniger the yellow lunules do not usually spread across to the edge (or if they do it is no more than 25% yellow), there is usually a narrow black strip all along the edge of the segments. But there are several other species in the genus as well, so you can't assume that all black-edged Eupeodes are luniger.

Martin