I'm sure gitrdun is right on the name, we have always generically referred to them as moles though. Lots in the area.
I probably should have explained that better... LOL... the traps were $15 each and I lost 5. I just take a shovel and dig about a 12" diameter hole 8" - 10" into the mound and clear away the soil to expose the hole. I set the trap into the hole and cover the sides with soil so that the only light remaining is coming from the back of the trap. Cheers, Mike