 A less reliable indicator is the row of black eyespots on the dorsal submarginal hindwing.In the American painted lady, those on the opposite ends of the row are often larger and have blue "pupils".In "V. annabella", this applies to the inner two spots, while in "V. cardui" some of the black eyespots may have tiny blue pupils in the summer morph, but usually have none at all, and the eyespots themselves are all roughly the same size.