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HI, a Good sequence of pictures, these wasps are parasites, they introduce the eggs inside the spider. Maybe it was inoculated first with some poison to immobilize it. It the wasp was carrying it, surely was trying to introduce it in a den in the ground.
Thanks Leuba for your comment. It is less common than other members of this family (Dasypodidae). I found it the field at 120 km from Neuquén City.
In the following site you can see a map with the places this species has been seen.