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It is unprobable that Oxybelus is lucking for 'free lunch' for the babies, because the bembix female feeds (as the only sphecid genus) its larve continuus when growing, so any food will disapear withinin minutes. I think, both species needs the same place or nest entrance.
Species ID in Israel is not possible, but uniglumis is excluded. I also cannot recognize the sex, because gaster tip is not visible.

Regards, Christian