My father-in-law keeps pipe stored in racks, and some critter likes to stuff the pipes full of grass. He needed to use a piece while I was there, and we fished out this nest. It had lots of grass in it, 2 grubs, and maybe a dozen of these green lacewings. All of the lacewings that had not been eaten were paralyzed but still breathing. I realize grubs are indistinct; is there any way to get close to an id on this? I'm thinking some flavor of hunting wasp, and a big one at that--these grubs were huge.

If it helps, the nest was clearly plugged and long-abandoned. These grubs had been provisioned and left to mature. I'm guessing with the lateness of the year that they were meant to overwinter?