Sambucus nigra L.
[Viburnaceae]
Varese (Lombardia), 315m
Populus alba L.
[Salicaceae]
Varese (Lombardia), 290m
couldn't find any helpful keys, my guess is T. tergestinus, any other suggestions?
The darker stripe on the gaster doesn't extend to the under part and the propodeal spines are quite long. The antennae are completely yellow and the median sulcus isn't very deep.