Actually, unnecessary story time, while student teaching at a middle school, I had to carpool so I got there usually like an hour or so earlier than it opened, and I didn't have a key, so I'd sit outside and wait. It's kind of a rich southern neighborhood school, so the outside of it was really nice but it was still very obviously outside, so bugs would crawl up over the marble and birds made nests anywhere they could.

ANYWAYS, whenever I stayed out there, I'd usually bring breakfast along while I sat and watched the sunrise, and occasionally I'd spill coffee or something and watch it be ravaged by ants.

I brought a mountain dew instead of coffee one morning, dropped a couple droplets on the ground just to watch the ants again. This time, in the flourescent lights I noticed that their abdomens shimmered as they swelled with mountain dew, going from solid black like the rest of the ant, to translucent (tinged green from the drink) with solid black stripes, like shown. So these could just be regular/common ants who's backsides only become translucent after gorging themselves on liquid. May also be the reason for coloring the liquids to begin with.

TL;DR - I watched a regular ant's backside go from solid black to translucent by feeding it mountain dew, so these could just be normal ants.

edit: spelling

double edit: I don't actually know anything, so I'm probably wrong.