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Hi Jan Willem,
The animals were tiny, I never thought they were bees when I first spotted them, that small! Can you see the hairs on the leaves?

The picture was taken yesterday in Rotterdam.

What details can help? I took more pictures because it is very hard to get both male and female in focus at the same time.

I cannot realy see any reddish parts of any significant size.

Here is another view:



and the wings: