I am thinking these are what we call "meat bees." A helluva sting - or actually, I think it is more of a bite. And they bite instantly when they hit you - and never a stinger - just a little chunk of skin missing. As stated, they live underground. When I find one of their holes (not easy to do) I wait until the sun goes down so they have all returned and then use a gopher gasser. It seems to kill them all. Later, if you do that and then dig up the nest it is sort of like paper mache. Someone then told me it was illegal to kill them???
As for a trap with a meat or similar lure, I have read that that will draw more to the area as they can detect that sent for a very long distance. There are traps which work very well - some kind of attractant and water. We used to use those and would catch hundreds quite easily. But again, we may have been attracting more of them to the area.
Once you have been bitten by one you will always remember it.