Watch out for the saddleback caterpillar
I got stung by the caterpillar yesterday. It did not feel to good. I did not see them, they were on the underside of some lilly leaves. I did notice the black specks (poop, I guess) and I should have know that there was something close by. They were small caterpillars, must be young ones. They are active in August and September. BEWARE!!!!
I don't know how to add a link but if you google Saddleback caterpillar you will find a picture.