@hingehead,
hingehead, I didn't like research when I was in college. I'm not thrilled now, but I feel compelled to oblige. (Sigh. Heavy lies the head that starts a thread.)
Here's some info about the doohickeys (scientific term) sticking out of these critters:
A first guess is that it’s a sexually-selected trait, but those are often limited to males, and these creatures (and the ones below) show the ornaments in both sexes. Kemp hypothesizes—and this seems quite reasonable—that “the hollow globes, like the remarkable excrescences exhibited by other treehoppers, probably deter predators.” It would be hard to grab, much less chow down on, a beast with all those spines and excrescences.
Note, though, that the ornament sports many bristles. If these are sensory bristles, and not just deterrents to predation or irritating spines, then the ornament may have an unknown tactile function.
Tokay gecko (definitely better looking than the reptile in the insurance commercials):