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Wow, nice things going on then! :D
I'm also looking forward to the publication of the paper! Dieter, is there also a paper coming on the presumed pedissequum complex?
In Holland we have done some research and until now most people are not really convinced there are more species, at least not in northern europe. I know in Germany one talks about dives, marginale and indeed stackelbergi, but are there official publications of those already?
Sorry Andy, I wanted to comment on your post but I couldn't resist in saying some more!:p
Your left picture is a male of Chrysotoxum festivum (or vernale), and your right picture is indeed a Xanthogramma, but in this case what we normally would call X. pedissequum! However, one never knows for sure these days......:D:D
Greetings,