Callosamia promethea is common on wild black cherry, Prunus serafina, at the University of Michigan Biological Station in northern lower Michigan. In this area the early emerging morph is preponderant, while to the south in northern Indiana, the late emerging morph is preponderant.
Waldbauer, G. P. and Sternburg, J. G.
"Adult Emergence in Two Univoltine Callosamia Promethea Populations: Preponderance of the Early Emerging Morph in the North and of the Late Emerging Morph in the South (Lepidoptera: Saturniidae),"
The Great Lakes Entomologist: Vol. 18
, Article 2.
Available at: http://scholar.valpo.edu/tgle/vol18/iss4/2