We recently saw a black swallowtail laying eggs on our parsley and took them inside. The two caterpillars have just formed chrysalises. We raise a couple every year including some earlier this summer. However, this is later in the season than we normally raise them. Can we expect these two to eclose and fly away or will they remain chrysalises over winter. If the latter, how best to treat them. I am in central NJ. Thank you!!