For those of you wanting a challenge, here are two interesting social parasites.
1. Megalomyrmex adamsae
These parasitize trachymyrmex colonies, feeding off their fungus. These have been kept before, so there is some info out there.
2. Solenopsis phoretica
Only known from two specimins. Biology completely unknown. Queen rides piggyback on Pheidole dentata queens. ( Unlikely anyone will find one, but hey, try it.)