Forum Entomologi Italiani

Yes it is D. diocletianus.
All Dichromacalles lives in Asteraceae (and perhaps some others families of plants). It is easy to find it under the leaves on the plant in stress situation (around parking, near road, etc.). Better plants are Asteraceae with "milk" o latex (Cichoroideae) and Carduus and Co (some part of Asteroideae)

Species of this genera are easily to catch at night with some light on the plants

Nicolas