Common in the foothills and to 7000', but only a rare stray in the Central Valley. Males are territorial perchers, often in paths or on rocks. Where Euphydryas chalcedona (q.v.) is strongly blackish, the females of the Northern Checkerspot are trimorphic - orange and male-like, black with yellow spots (an apparent mimic of E. chalcedona), and intermediate. Where E. chalcedona is mostly red, only the male-like female morph occurs (true also at Donner, where there are no chalcedona).