I remember being down in CA couple of years ago where a friend of mines uses long grass stems where he made a loop/noose at one end to catch those little guys. I didn't believe it'll work but he actually caught bunch of them with that method.
If they're in your backyard maybe trap the fall trap method, did a hold large enough for a bucket and set a bucket in with maybe Vaseline smeared on the top to keep them from climbing out lol.