I found some D. lindo while visiting West Texas in '08. Dry soil with rocks / bark to hide underneath should work fine.
It rained a few times while we were out there, so an occasional misting shouldn't hurt (as long as you have plenty of ventilation).
If your emperor scorpion stops eating, don't panic.
Be nice -- you were a noob once, too
"Never ask an engineer to explain something, because he will."