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The pupa is reddish brown, a little more than 1/2 inch long, and enclosed in a silken cocoon in the soil & leaf litter; In autumn, caterpillars drop to the ground and spin silken cocoons. They remain inside the cocoons during winter and transform into pupae in spring.
urban school yard, dug up at the bottom of a Sweet Gum tree
Don't know for sure that this is a correct identification but a good guess because we have seen the caterpillar on the tree where we dug up the pupa