Hemileuca nuttalli

[MJS323]

In most, if not all, of Hemileuca nuttallii's range, it is on a two year life
cycle.  One summer as larvae after overwintering as eggs, and the next summer
as adults after overwintering as pupae.  Your nuttallii pupae should naturally
emerge next summer, probably late July to mid August in the field.  Most of the
Pseudohazis group of Hemileuca (eglanterina, hera, nuttallii) are two year
cycles in most of their range, except eglanterina does have one year cycles in
parts of coastal and inland California.

Mike Smith