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Chris, you must have missed the link I put in my first post showing Arp's pics of male genitalia of the species we have here, as well as other features to look for. He used to post on WAB but now he can be found on WATW.

http://www.wildab...photo/8541

I had a thread there in 2009 when I was trying to get to grips with these, I'm not sure if I saw P. cognata that year but I certainly did have it in 2010. I think it was later than the other species when I saw it, and got good pics to show the vital ID points. You might gain some tips from reading Arps input there, also in bonitin's thread.

http://www.wildab...emale.html

http://www.wildab...l#post8686

Nick, I didn't see any courtship behaviour other than the female munching on a fly as they were already mating when I found them! I have put pics on my site if you search for Panorpa there you should be able to find them all.