Eupeodes corollae is a very common European species of hoverfly.
It is very tiny.
Adults are 6–11 millimetres in body length.
Males and females have different marking on the abdomen; males have square commas on tergites 3 and 4, whereas females have narrow commas.

1st photo: A male. In my yard, Hilversum, The Netherlands, 1 July 2013
2nd & 3rd photo: A female. Boekel area, The Netherlands, 6 July 2018