Thorn treehoppers

Umbonia crassicornis is a common and widespread member of the family Membracidae, and one of numerous species colloquially referred to as thorn bugs... This is a variable species as to size, color and structure, particularly the pronotal horn of males (which is more angled posteriorly than the females’ and often somewhat expanded apically). This tall, essentially perpendicular thorn-like pronotum discourages birds and other predators from eating it, if only by mistakenly confusing it with a thorn... The range of this species is from Northern South America all the way to Mexico and Florida. 

Text and photo via Animals, Animals, Animals.