I've now found the species in the photogallery, but it is under the genus Eurybatus. Which is correct (the name I gave was from a 2002 book)? I notice that the species name is also slightly altered to show the male genus (Eurybatus) as opposed to the female genus (Rosalia).
Eurybatus differs from Rosalia in several characters:
Both males and females do not have tuft of hairs but spines on the antennae.
Males do not have a tooth at the outer angles of the mandibles.
Male have 6 (rather than 5) abdominal segments.
The body is covered with a yellow-orange-red pubescence in Eurybatus and a white-grey-greenish-bluish in Rosalia.
These characters may be considered as generic or subgeneric. However, the species do not form a continuum (= intermediate forms do not exist); hence, the existence of two genera is better supported. P.s. Wonderful picture and beetle. I'd like to find it!