I've caught and kept several related species. i fed lots of root veggies and a lil dog food and i would rarely give water since there from here, Mesa, AZ. just sprayed 'em when it rained. i have not gotten any larva, but i haven't tried that buried carrot thing, but i plan to now next time i grab some.
my reptile/bug room is @ 83F. kept them on sand from outside (freeze sand, wood, etc. in the freezer for a couple of days to kill any unwanted visitors like termites.) and gave a cactus skeleton for them to hide/climb.