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Hello Juergen,
Well, in Syrphids it is like this: (by the way, you start counting from the thorax to the end of the abdomen) the first abdominal segment is always very small and hardly visible, so the first bigger segment you see is number 2!
So, in your picture with the arrow, the tergite you call 2 is in reality tergite 3! So you have to look one tergite beyond that one.
And then you have to look at the hairs at the side margin of that tergite. The color of the hairs is not that difficult, in L. lucorum it is very well visible as silvery white, whereas in L. inopinata they are really black!
Greetings,