Geographic location of the bug: Nevada City, Ca
Time: 10:31 PM EDT
Your letter to the bugman: Can you please tell us what this moth is?
How you want your letter signed: Nancy
This is a Ceanothus Silkmoth, and ironically, you have an image of the moth on a lilac. Adult Ceanothus Silkmoths do not feed, but the food plant of the caterpillar is the Ceanothus, commonly called a California lilac, which is not related to the blooming lilac in your image. The antennae on your individual leads us to believe it is a male.