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I've just found Collin's detailed description of trinotata (as maculata) and compared this with the gallery images of O. ornata. I am now fairly convinced that this is trinotata. It has much darker legs than oranata, also the dark mark on the post pedicel extends to the base of the segment, unlike ornata which has the dark marking confined to the anterior part of the post pedicel.

If the above seems good enough to be certain, I can upload the images to the gallery. Paul?