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I didn't found a way of identify this beautiful subject that I've found pollinating the flowers of Eryngium campestre in the Monegros region, NE Spain.
I think this is a digger wasp (Sphex). Your specimen looks almost exactly like Sphex pensylvanicus
except that there is no hint of red on the abdomen. On the other hand Sphex lucae females have red abdomens but sometimes the red is only a hint – see the bottom picture on this page.
Both of these are native to N. America which leaves me wondering if this is an illegal immigrant or an undocumented European wasp, because I can’t find anything like this except USA based.
There is a video of Sphex pensylvanicus pollinating flowers here
which may be reminiscent of the wasp you saw.
Thanks for your reply, Alan, but this wasp is a Pompilidae, as I stated in the title, and not a Sphecidae: the tegulae clearly are in touch with the pronotum.
Appart, it's smaller than a Sphex, or ar least that the common european ones. Comparing with the Eryngium flower I would say that it's about 15-20 mm long.