For the females, the wing color is the easiest feature to ID. Limbata females have a lemon-yellow hind wing. The S. californica females have brown hind wings with purplish highlights. The male S. californica has 4 dark bands on the upper surface of the abdomen. The male S. limbata lacks the bands. But the bands are really only easily seen on DEAD specimens. They seem to be the only ones that will sit still long enough to show the bands.