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Hi Henrik, you are right and cruciatus is different - though small stripes on the notum are sometimes visible. Remains - I think - B. quadrifarius. Unfortunately I have no detailled information about it except that it appears in Greece, too, and: "...has two longitudinal stripes formed by white hairs on the mesonotum and transverse bands...at the posterior margin of abdominal tergites. Wings...sexual dimorphic; females hyaline and males with basal infuscation." (The bee flies of Jordan, A. KATBEH-BADER & S. ARABYAT)