Tuesday, September 6, 2011
When ready to morph into a chrysalis the caterpillar will hang upside down for a while and form the letter J (see above). The green lines toward the head tell you they're going to morph, but if it's already getting dark out this isn't going to happen until bright and early the next morning.
10 to 14 days later they hatch. This also happens in the early morning, but they'll turn transparent the day before.