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Well, I think infojardin is a little bit confusing because it's difficult to track the threads and they don't allways answer.

It was the first time I really paid more attention to the courtship of tephritids. I thought it was very interesting the way the males pointed the pheromone sacs towards the females. The males allways pointed the sac that was on the female's side. As shown in the video, as soon as the female ran away the inflated sac deinflated:).

Valery I think that, by comparing photos on the net, the thistle belongs to the genus Cirsium.

One more photo: