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I think this one is Exoprosopa sp. Sorry about the head being back to front - bit disconcerting I know. I didn't realise until after we had done the photos that I had placed it wrongly (fell off when I removed it from the car grill - you get that:()

I witnessed this species, or a very similar one, engaging in some sort of display activity, where a pair would fly with the one in the rear slightly higher, but always keeping the same distance apart. This activity seemed to me to be fairly agressive, but I was not sure if it was two of the same sex or different.