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Alaskan Swallowtail
Butterfly.--This interesting form of the species, known to entomologists as Papilio machaon, Linnaeus, and to every English school-boy as "the Swallowtail," represents a colonization from the Asiatic mainland of this insect, which is the sole representative of the genus on English soil. It differs from the English butterfly by having more yellow on the upper side of the wings, and by having the tails of the secondaries much shorter.
Early Stages.--Undoubtedly these are very much like those of the forms found in Europe and Asia, and the caterpillar must be sought upon umbelliferous plants.
Thus far this insect has been received only from Alaska, and is still rare in collections.