I checked the Rue and Moon Carrot plants carefully and counted 22 newly hatched caterpillars/larvae.
Here's the life cycle in photos - some taken last year and some this year
Single eggs are deposited on a leaf
Indiviual eggs on leaves
Newly hatched larvae
A few days later, they have the same appearance but are larger
Then, they take on their characteristic bird droppings appearance.
The chrysalis photo is from the http://www.naturemuseum.org/online/thebutterflylab/fieldguide/native.html
This butterfly is the largest one. Its other common name is Orange Dog because they decimate citrus trees - not killing the trees but damaging crops. Northeast OK used to be just barely in their range but their range has grown significantly.