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Hello Elck,
If I am not mistaken I have seen this picture before, and I thought (and still think! :-)) this is X. segnis.
It is based on the bigger bristles that are visible on the underside of it's femur 3. X. segnis is the only one with this feature. And I think the portion of yellow on tibia 3 is smaller than it would be in X sylvarum.
Greetings,