I saw this wasp fly from a tree carrying the katydid. It landed near a hole in the ground and dropped the katydid. The wasp then went into the hold and did a bit of excavating and then dragged the katydid into the hole.
These eggs were identified by Ken Walker as being those of Tettigoniidae spp. I did bring them inside a day or so after these photos were taken, but the only thing that hatched out of them then were two tiny wasps. I think that some had already hatched when I brought the leaf inside.