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Pamphilius betulae
Just spotted this guy sitting in the last rays of the sun on a nettle leaf..
I would not think of a stonefly due to the different anatomic structures. As I remember stoneflies have some kind of "tail". I just checked for some Blattwespen, but didn't find any match. I would once give-up with stoneflies and try other insect larvae, maybe in some wasp families??
It looks a bit like a Stonefly larva of perlesta decipiens, except the black back and wings...hm. This one riddles me for ages now...
May following links help you.
http://en.wikipedia.org/wiki/Plecoptera
http://tolweb.org/Plecoptera