Install a Bug Door
A bug door at the Mercy School, Wexford.
These are great fun and so, so easy!
Make a door out of wood or metal, including a handle, and lay it flat on the grass. Soon the grass will disappear (or you could remove it to speed things up) and all the bugs who like dark, damp places will flock!
It's also a good idea to raise the door ever so slightly on some stones or wood so the bugs can squeeze through.
Whenever you want to examine some bugs just lift the door - it's an excellent resource. Simple!