Basically this game is a variation on "urban legend" where you tell an urban legend and your friends need to guess if it's a real urban legend or just something you made up.
Only in this game you either describe a real ant species... or make one up. And (no google) the rest of the players need to guess if you are describing a real species of ant... or just pulling our leg.
You must give a scientific name, physical description, geographic region, size... then any information that makes them stand out behaviorally.
Now we know what game we could play if we ever had a formiculture party!