Ivan, I only make a comment about the genus Leptophyes, so I am really not sure about the species name! If I would be convinced about the species I would have make a suggestion ;-)...
Please, re-check, there might be other Leptophyes sp. in your area:
PDF to download: http://www.google.ch/url?sa=t&rct=j&q=leptophyes%20of%20serbia&source=web&cd=1&ved=0CCwQFjAA&url=http%3A%2F%2Fhrcak.srce.hr%2Ffile%2F166444&ei=7yCEU_O2L6LU0QXk5YGICw&usg=AFQjCNGP512RfqVbYrEVXVpgqeYqE5rX4g&sig2=axOzWO2NlhV8xNYDE881Kg&bvm=bv.67720277,d.d2k&cad=rja
http://www.mapress.com/zootaxa/2010/f/zt02506p042.pdf
http://www.biologie.uni-ulm.de/cgi-bin/query_all/details.pl?id=29171&stufe=7&typ=ZOO&sid=T&lang=d
http://bibdigital.rjb.csic.es/Imagenes/P0011_07/P0011_07_464.pdf
http://www.landesmuseum.at/pdf_frei_remote/EntBer_31_0049-0055.pdf
http://de.inforapid.org/index.php?search=Boscis%20Zartschrecke
Yours looks still like being a nymph, so ID might be anyway not easy. It really could be Leptophyes punctatissima, I am just not sure.
There is also a little misspelling in the common name: Should be bush not buch...
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