Red-humped moth pupa

Description:

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.

Habitat:

urban school yard, dug up at the bottom of a Sweet Gum tree

Notes:

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