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I'm sorting out all my photographs from last year, and came across these. I labelled them Cyrtopogon meyerduerii, but I don't see now why it shouldn't ne Lasiopogon cinctus. Can anyone help me with the ID?

Location: Nufenen Pass, Switserland, ca 2400 m altitude. End july 2007. Steeply sloping alpine meadow with meting water, may large boulders. The flies were mostly resting at these stones, as in the photogrpahs. Medium sized robberfly.