Marmalade Hoverfly on flower
Marmalade Hoverfly (Episyrphus balteatus).
You can keep hoverflies apart from other flies by looking at the veins in their wings. Hoverflies have a floating vein which flies don't have. On this picture you can see in the middle of the left wing. There are two veins next to each other, the one which ends with a small end is the floating one.
(dutch source: http://www.gardensafari.net/dutch/zweefvliegen.htm)

"Episyrphus balteatus", sometimes called the marmalade hoverfly, is a relatively small hoverfly of the Syrphidae family, widespread throughout the Palaearctic region, which covers Europe, North Asia, and North Africa.
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