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A black-and-red spotted, white, tailless swallowitail. It's black-and-white ringed antennas separate it from the similar Clodius Parnassian.
Prefers rocky outcrops, but can be found in many habitats in open mountain areas.
May to Aug., less time at any particular locality.
Some people treat the Rocky Mountain and California Sierra populations as different species from the Old World populations that are also in Alaska. While this is certainly possible, there are almost no published data that support this treatment. Please see page 4 of the commentary section of the second edition of the NABA Checklist -- https://www.naba.org/ftp/check2com.pdf -- for a discussion.