Asp

Known around these parts of Southeast Texas as an “asp”, the caterpillar of the Southern flannel moth (Megalopyge opercularis) hides poisonous spines within the pelt of hairs that cover it.  Labeled as the most venomous caterpillar in the US, this harmless looking caterpillar has a sting from that packs a wallop, which I have experienced personally. If I were to try and describe its severity- it's akin to placing the business end of a lit cigarette against your skin.  I’ve read that a good way to ease the pain is to remove any spines that were left behind in your skin with a piece of cellophane tape.