iPod no longer shows as device

My first visit to iTunes interface in about a year. (Tired of the songs living in my iPod; time to remove them and replace with a different batch from my purchased music). The iPod is plugged into my Mac, but it does not show as a device in the left-hand column. The last time I used the interface, it showed as a device. I simply dragged songs into it, or deleted songs from it. Is there a tutorial showing the new method? Thank you. iTunes 11.0.2(26). Mountain Lion.

- Robert