I myself am all about the worms. If southerns can be switched to worms, and prairies will take worms, then I've got no complaints with either. In the parks near where I live in Philadelphia, I find so many of the really huge nightcrawlers (all of which are exotic invasive species from Europe and China, by the way, so I have no problem collecting them from the wild) that I could feed hordes of worm-eating small snakes. My problem with the northerns is they really want the salamanders, and the same was true for a southern I caught nearbye and that I let go after trying to switch.
For what it's worth, I'm going to be exploring more in the Wildlife Management Areas in NE and Central PA - basically within a 1.5 hour radius of Philly.
Cheers,
Billy
Phillyherping