Two aberrant forms of the tiger swallowtail butterfly. Papilio glaucus, are described. Both of these aberration types (one in a male, the other in females) are believed to be previously unreported and both are from the Great Lakes hybrid zone and plant transition zone (41 ° _44°N latitude). It is, therefore, possible that genetic introgression from the northern tiger swallowtail P. glaucus canadensis may have been involved in some way with these abnormalities.
Scriber, J, Mark
"Two New Aberrant Forms of Tiger Swallowtail Butterfly From the Great Lakes Hybrid/Transition Zone (Lepidoptera: Papilionidae),"
The Great Lakes Entomologist, vol 23
Available at: https://scholar.valpo.edu/tgle/vol23/iss3/1