That sound like a great idea. I would give it a shot. Thanks!Probably ordinary window screen, or some mosquito netting, there are even smaller flies that sometimes live in the substrate that can get through
just about anything short of a wall. When I've needed small mesh, and don't have any handy options, I will use a couple layers of window screen offset
just a bit, you'd need some sort of frame to make the lid. Just remember that depending on the beetle species, they may be able to push off a lid that's not
weighted or fastened down.