Origin of melanism
Examples from the Web for melanistic
One melanistic individual was taken one mile northeast of Whitehorse on July 11.Mammals taken Along the Alaska Highway|Rollin H. Baker
Melanistic red squirrels, Tamiasciurus hudsonicus, are everywhere rare and in any case appear as individuals and not populations.
Melanistic specimens are rarer still, and I have seen but one, which was caught in Lodi Township in 1875.The Mammals of Washtenaw County, Michigan|Norman Wood
This is not strange because melanistic specimens could not be identified anyway.
Abnormal white-spotting dorsally occurs as does yellow and melanistic coat color.North American Jumping Mice (Genus Zapus)|Philip H. Krutzsch