I saw these little planthoppers every day of my trip. They are a bit skittish though, and jump/fly away easily.
One of my references has a very similar looking Costa Rican planthopper identified as a Nogodina species. That at least makes me feel comfortable that I’ve gotten the right family here, Nogodinidae.
There doesn’t seem to be a lot known about this family. There’s not even a wikipedia page yet :). According to Marshall, it’s restricted to Central and South America.