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Hello Juergen,
I think I can help you! :-))
The first picture is the female of Parasyrphus punctulatus.
Normally the spots on the abdomen are quite characteristic, but in this picture they are more difficult too see. But I am quite sure it is this species.
The second is very nice! It is a male of the species that was formerly known as Megasyrphus annullipes or Megasyrphus erraticus.
Nowadays it belongs in the genus Eriozona, so this is a male of Eriozona erraticus!
Greetings,