Cyllopsis pyracmon, or Nabokov's satyr, is a species of alpine, arctic, nymph, or satyr in the family Nymphalidae.[1][2] It is found in North America.[2][3]
Pelham, Jonathan P. (2008). "A catalogue of the butterflies of the United States and Canada with a complete bibliography of the descriptive and systematic literature". Journal of Research on the Lepidoptera, vol. 40, xiv + 658.
Further reading
Arnett, Ross H. (2000). American Insects: A Handbook of the Insects of America North of Mexico. CRC Press.