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Western White
Butterfly.--Not unlike the preceding species on the upper side, but easily distinguished by the markings of the under side of the wings, which are not concentrated in blotches, but extend as broad longitudinal rays on either side of the veins from the base to the outer margin.
Early Stages.--These require further investigation. We do not, as yet, know much about them.
The species has a wide range in the mountain States of the West, where it replaces the Eastern P. protodice.