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Boisduval's Marble
Butterfly.--The figure gives a correct idea of the upper surface of the male. The female on the upper side is marked with light-black spots on the outer margin near the apex. On the under side in both sexes the apex of the primaries and the entire surface of the secondaries, except a small spot on the costa, are profusely sprinkled with small brown scales. The veins of the hind wing are brown. Expanse, 1.65-1.95 inch.
Early Stages.--The caterpillar, which feeds upon Turritis, is green, shaded on the sides with pale blue, striped laterally with white, and covered with transverse rows of minute black points, each bearing a short black bristle. We know nothing of the other stages.
The species ranges from northern California to Alaska.