Posted by Raphael Weniger on 13-03-2015 19:29
#2
In central europ I would think that it is a Chrysotoxum festivum. charackterised by the complet yellow femora, in difference to the black bases in C. vernale which is quite similar looking species. But I am not sure if there are other similar species further east. at least C. festivum is an palearctic species.