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I found these hoverflies in July 2021 on different Italian mountains (Lombardy region, Northern Italy), in particular:

A) Sasso Malascarpa (CO, altitude: 1200 m a.s.l.);
B) Corni di Canzo (LC, altitude: 1300 m a.s.l.);
C) Grigna Meridionale (LC, altitude: 1700 m a.s.l.);
D) Piani di Artavaggio (LC, altitude: 1600 m a.s.l.);
E) Monte Cavallo (BG, altitude: 2000 m a.s.l.).

Could they be Eupoedes luniger? Unfortunately, the pictures are not very good.
Thanks in advance for any help!