Very nice - This is a spider wasp in the family Pompilidae.
https://en.wikipedia.org/wiki/Spider_wasp
They paralyse spiders, then drag them to a nest and lay an egg on them. When the egg hatches, the larvae develops by eating the spider. Sometimes they remove the legs from the spiders - as in your picture and the following.
https://commons.wikimedia.org/wiki/File:Pompilidae,_Cuenca,_Ecuador..JPG
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