I found the nymph crawling up my wall and brought it into an enclosure with pieces of bark for a substrate. It finally quite crawling and emerged--I'll post a sequence later. I liked the freaky effect in this photo.
This male Magicicada tredecim was emerging from its nymphal case about 10 p.m. on the wall of my house, along with several others. I caught a few shots of the process, and then kept it in an enclosure, perched on a stick, so I could observe the adult in the morning.