As far as I can guess, the only way that would be even partially successful in keeping them would probably need an incredibly large foraging area and several hundred ant colonies in formicariums designed in a way where a part of it without the queen, but with lots of brood and workers, could be placed into the army ants' enclosure.
I'd be interested in trying to figure out how to find raids of any of the subterranean army ants...
I have no idea how I would ever find one unless I got really lucky. We've got several species here that I would love to watch another raid of.
Both the raids I've seen were just by sheer luck -- they happened to be attacking from beneath the Pheidole nests I found.
Edited by cpman, April 18 2015 - 7:07 PM.