After several weeks of eating, I moved the larva to a jar with a couple inches of moist, compressed substrate. It burrowed down and dug out a pupal cell at the bottom. After a week or two inside the cell, it molted into a pupa, I think on November 12th. The back and sides of the pupa are covered in short, golden brown setae, it is quite soft and fuzzy, not what I was expecting!