Unknown caterpillars in the dill

I've been hoping to see some swallowtail caterpillars take up residence in the dill and parsley before it gets pulled up to make room for cucumbers and beans, but instead these guys came to visit. Anyone know what type this is? The dill seedheads support whole communities of insects. Bought some veggies at Shoal Creek Nursery: yellow pear tomato, ichiban eggplant, sugar baby watermelon, zucchini, pickling and lemon cucumbers. The last one is something I've wanted to grow for years, and I was really happy to see it in stock! Another day in the life of the iris, and, below, my garden muse watches over the yard.