They are indeed in PA. My sister-in-law got bit on the cheek last summer by one at Calidonia State park near Chambersburg. In fact, they had several cases in Calidonia SP last year of brown recluse bites. Her cheek puffed way up and they had trouble getting it back to normal because they didn't want to lance it because lancing it would leave a scar on her cheek. They're definately here, and definately nasty.

Slice