Just writing to let you know... that is a Black Swallowtail larva! They are definitely that way when they are small. They get green with black stripes, and yellow dots after they are in 2nd or 3rd instar (shedding). Hope that helps, and it turns out what you were hoping for after all! :)
:) Glad you were able to get some! You'll probably find them on the parsley, too. They are very cool! My brother raised them for a couple years, about 7 or 8 years ago... hundreds of them. They're really fun!