Published online by Cambridge University Press: 31 May 2012
Papilio machaon var. aliaska Scud. In the proceedings of the U. S. National Museum, 1932, LXXXI, 1-15, Austin H. Clark discusses at some length the racial variability of Papilio machaon in North America, creating what he designates as two new subspecies.
* Since writing the above I have been enabled, through the courtesy of the Director of the Carnegie Museum, Pittsburgh, to study the type specimen of calais and find that my conclusions, as expressed in the above paragraphs, are correct.