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Hello
Its from Bernese Oberland CH 560-600mNN: M1 is a Melanostoma female and M2 is a Melanostoma male. But are they both M. mellinum?
Greeting Maja Beutler

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Hoi Maja,
Hmmm, a bit difficult but I think they are both Melanostoma scalare!
Greetings,

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Hello Gerard
Your answer makes it clear to me, that I'll never learn to know the difference between the two without killing some and looking at them exactly. I'll Try that.
Thank you! Maja