greenterra - festae were never truely in Amphilophus, they were dumped there for a brief moment while the other genus were being sorted out. When Kullander restricted Cichlasoma to the port cichlids, all central americans then became Heros as it was the next available genus, and most centrals at some time resided in that genus. Then Kullander restricted Heros for sev's, and again pretty much all centrals were dumped into Herichthys which as we know was then restricted to the texas complex (and why pearsi and bocourti are still listed in this genus, I agree with nutty that they are deffinately not a texas group cichlid).
After the texas group was restricted, that's when most of the central genus were broken up as well. Right after the restriction, again all centrals were technically in Amphilophus for a brief moment until they were further divided up into the various older genus (and a few new ones) that they had been before Regan lumped them all into Cichlasoma.
Festae really shouldn't be listed as Amphilophus though, their mouth structure is a bit differant than the other midas cichlid group. But then it hasn't been that long scientificly yet. Heck, the blue acara group (blue acaras, green acara, gold acara, green terrors) was just formally described last december, and it's been orphaned for 20+ years now.
It's my belief festae will share a genus with ornatum and atromaculatum eventually as they share a similiar jaw configuration (based on photo's, I deffinately don't discect ... will leave that to the scientists).
OP - As for the lists, I use the CRC registery for those two families atm, but they are being worked on as well (as Nutty said). DNA is playing havoc with traditional diagnostic trends so there will probably be much more shifting over the next few years.
Thats my man!