They sell plastic domes with a base for each in our local hardware, even groceries stores, which hang from wherever you want to put them. There is a mix that you place in them which attracts them. IOnce they get in they cannot get out and die, then you can dispose of the whole thing according to your local landfill rules. I'll see if I can find the name of them.

IN the meantime, someone posted how to make your own trap: HERE and HERE with pictures!

But THIS ONE looks like the best of all with clear illustrations, etc.!