This was posted on Facebook, and after reading it, thought it might be beneficial to post it here as well. This talks about the different species, and requirements for humidity. I provide Admirals and Viceroys more humidity from experience--this article verifies this. I question leaving frass in raising containers for up to a week. Cleaning out the containers once a day or more often makes sense to me.

Another species that seems to require more humidity is the Spicebush Swallowtail, as their host plants wilt quickly. It seems to me that it's important to make sure the host plants are kept in an environment that keeps them from drying out.

So here's the link:

Here is a link that might be useful: Six steps to keeping caterpillars healthy