Rosalia alpina (Linnaeus, 1758)
Subfamilia: CERAMBYCINAE Tribus: ROSALIINI
Body length: 15 - 38 mm.
Life cycle: 2 - 3 years.
Adults in: June - August.
Host plant: polyphagous in deciduous trees, preferring beech (Fagus), but also in Ulmus, Carpinus, Tilia, Castanea etc.
Distribution: Europe, Caucasus, Transcaucasia, Near East.
Rosalia alpina develops in dead compact and relatively dry wood of mainly beech (Fagus) in Central Europe. However, in Greece (Naoussa, Vermio Grameni) we observed development in living tissue of field maple (Acer campestre).
This beetle i think is infrequent and i was lucky because my childrens found it.