Why are these bugs sporting wing tattoos? Is it ironic, like a hipster with a finger mustache? Did jumping spiders save their lives back in 'Nam? Was it some sort of ant initiation? Without an informant in one of the major ant gangs, we can't know for certain (and there is some doubt that the shapes are even intentional), but it's been proposed that the fruit flies are trying to scare off potential predators by making it appear as though they're already being eaten, are surrounded by dangerous creatures, or are the dangerous creature themselves. Any way you cut it, the lesson is simple: "I'm more trouble than the meal is worth, homey."
"The last two who tried wound up dead and nailed to my ass."
This kind of things isn't exactly novel. In fact, there are all kinds of different fruit flies with weird wing markings that they'll wave at spiders to trick them into backing down, thus earning the species their nickname "the frontin'est motherfuckers in nature."