![Saddleback Caterpillar](http://upload.wikimedia.org/wikipedia/commons/thumb/b/b8/Acharia_stimulea_0795036.jpg/240px-Acharia_stimulea_0795036.jpg)
I got stung by one of this little guys brothers while hiking on the AT this weekend. Hurt like helland I still have a raised red area where he hit me.
The caterpillar will eventually turn into a moth and be non-poisonous, but in its caterpillar stage, it has the worst of the sitnging slug caterpillar venom.