According to various Web pages, Sabulodes aegrotata caterpillars are a major pest in avocado orchards. I'll try avocado leaves as forage tomorrow. We don't have an avocado tree, but enough of a neighbor's tree hangs over our back fence.

then the adult is plainer than what I expected Little FancyPants to turn into. Just brown with subtle markings.

Mine haven't shown themselves to be truly omnivorous. They eat buddleia and blackberry. They've ignored rose, loquat, and pelargonium although the first two of those are in Rosaceae, like blackberry, and I found eggshells resembling theirs on a loquat leaf. I tried pelargonium because other geometrid larvae are on it.

Could the presence/absence of the two spots on the head be sexual dimorphism? It's a puzzle.

They don't have names, but I think of them as distinct individuals, if only by location. I'm surprised that they behave differently, making their nests in various ways, one against glass, others between leaves and so on.