Indeed, but I wasn't sure if they followed the splits in their signage (a docent certainly spoke as though they were one species). Also, I had seen the GlobalSpecies listing that Chlidonias mentioned (though those are obviously quite outdated) so wanted to make sure.
I think it's fair to say they have Heloderma (horridum) exasperatum.
a little bit of a separate issue from what specific Beaded Lizard the zoo has, but LAIR opened in 2012 and the Beaded Lizards were split into four species in 2013 so the signage in LAIR would pre-date the split.