I have some larvae at the moment but no experience with the actual beetles as of yet. They seem to have a long prepupal period - mine have made pupal cells against the container walls but are taking their time about it! The larvae have been curled up in there for weeks, just shifting around every so often to let me know they're still alive. Orin's book says to supply the larvae with finely ground decayed wood. (I think I gave mine more leaflitter than I should have, so maybe that's why mine are taking a while.) According to the book, the adults eat juniper but if you don't have that they will also eat pear or jellies. Hope that helps!