I've read a few places that they are now "boa sigma" but haven't seen an official cite.
If housing space is at a premium then Tarahumaras are the way to go. My males never outgrew 32-qt tubs. It doesn't mean you can't give them more space and they'll stress out over it like ball pythons do either, if you want to go with display enclosures they'll be good in that sort of setup also.