Subject: Late season black swallowtail caterpillar
Location: Evergreen Park Illinois
November 9, 2015 5:26 am
First (Fall) black morph black swallowtail caterpillar that I have seen in my garden over the years. I always seem to end up with one or two of them in Fall, but usually they are the standard green color. I put a cold frame up to give it a better chance of pupating as we have had frosts here the last few nights.
This is a very dark Black Swallowtail Caterpillar, but BugGuide does have some images depicting this dark coloration.