Longicorn Beetle - ? wasp mimic

This longicorn beetle was about 25 mm long and looked very much like a wasp. But unlike a wasp it was not flying around but clambering over the flowers. Its antennae were also a giveaway; they were long, slightly curved with elongated segments.
What was wasp like were the thin and fragile-looking hind wings which were exposed because of highly reduced elytra. The abdomen had white rings and legs were long and brown.