The Red tailed bumblebee (Bombus lapidarius) is a frequent visitor of Trailing bellflower (Campanula poscharskyana), here a female forages for nectar.

References
1 Nederlands SoortenregisterThe Red tailed bumblebee (Bombus lapidarius) is a frequent visitor of Trailing bellflower (Campanula poscharskyana), here a female forages for nectar.
References
1 Nederlands Soortenregister