I know this response is a bit late but I'll post it here anyway, I've personally been thinking about this recently as well. I am very interested in defeating army ant raids with other species. rather than playing the level front line with different ants, however, I suggest adding a new optional...
In nature, some termites can produce a special caste that has the ability to shoot sticky mucilage at enemies. I have done some research on the exact species chosen, but nothing turned up. I would like to ask if anyone knows if macrotermes bellicosus can spit mucilage.