You got the fertility off the majestic species. Well done!

Now for industrious...
It pays to check each species in the bee data bank after using it to mutate a new one. Does it have any further mutations? If not, and if it doesn't produce any resources you're interested in, throw away all the drones (built a gene pool yet?) and breed the princess with some other species until you've stamped that line out of your collection. If it DOES have further mutations, keep one princess and one drone (or one stack of drones, if you've got 'em stacking) - don't fall into the trap of trying to store everything. In this case both noble and majestic bees will be useful later, but not for quite some time.