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I'm just back from a holiday in Switzerland. Marvellous mountains, with many robberflies! I hope this forum can ID the ones I photographed :D

This one I only saw at ca 1900 altitude, in half open coniferous woodland. They may rest on the mountain paths but more often I saw them on tree trunks. Medium sized for a robberfly, say ca 15 mm. The yellow bands are especially conspicuous is the fly lands and holds its wings open.

Although I'm not sure, I guess these are male and female - though I don't know what is the male, so that information would be useful too!