Appearance
The wingspan is 30–38 mm. The forewing underside basal orange colour is vestigial or absent. The hindwing upperside is pale orange or yellowish and the marginal band of the hindwing is black.Behavior
Adults are on wing from mid-March to June in one generation per year.Food
They feed on the nectar of various flowers, including Salvia columbariae, Asclepias cordifolia, Ribes aureum, Dichelostemma capitatum, Clarkia, Vicia, Cirsium and Stachys species.The larvae feed on Clarkia unguiculata.
References:
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https://en.wikipedia.org/wiki/Proserpinus_clarkiae