Insect and Spider Identification: CLOSED: Please help me identify this caterpillar! :), 1 by BlueCrab

BlueCrab wrote:
Help! My lemon balm is under siege! I found a bunch of these caterpillars munching on my lemon balm and I was curious to know what they are. The pictures are of the littles ones that I could find today but I have seen bigger of the same species over the weekend (and you know I didn't have my camera then!). It is black with faint white lines that run down its body. It's head seems to be larger than the rest of its body and is rusty colored. Any information would be greatly appreciated! Thanks for your help everyone!