The closest match I can find is Paropsis lownei, but I'm never confident with identifying leaf beetles. A large leaf beetle, which appeared much darker in natural light compared to the photos. Three photos uploaded.
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.