With or without tails. Female with yellowish tinge. Underside pale gray to white. Yellow to red spot at hindwing lower edge. Eggs are laid singly on stems of host plants where they hibernate until spring.
Caterpillars feed on leaves.
One flight from May-August. Nectar from flowers including milkweed and Indian hemp. Willow thickets, open woodlands, streams, oases. G4 - Apparently secure globally, though it might be quite rare in parts of its range, especially at the periphery. Butterflies of Baja California.