During the summer of 1983 seven melanistic male promethea moths appeared among several hundred males that emerged from cocoons we were holding in the laboratory.
Waldbauer, G. P. and Sternburg, J. G.
"Melanistic Males of Callosamia Promethea (Lepidoptera: Saturniidae),"
The Great Lakes Entomologist, vol 18
Available at: https://scholar.valpo.edu/tgle/vol18/iss4/3