Clodius Parnassian (LEP17) Parnassius clodius
Parnassians occur in the western United States. Clodius flies lower in the mountains than Phoebus and differs by lacking any red spots on the forewing. It is scarlet appearing only in the central spots of the hindwings. Otherwise it is mainly milky white with black spots. Females are dusky and largely transparent, and have more red spots underneath. Caterpillars feed on bleeding hearts.