White, pupal cast skins of baccharis gall fly, Rhopalomyia californica, on a distorted, swollen, and discolored terminal of coyote brush that was galled by feeding during the midge's larval stage.

White, pupal cast skins of baccharis gall fly on a distorted, swollen, and discolored terminal of coyote brush that was galled by feeding during the midge
Credit: Joyce Gross