Platysamia columbia Sm. has not been recorded from southern Ontario nor from Quebec since the beginning of this century. At that time it was recorded as extending from Maine to western Ontario and south to southern Michigan. In 1937, Sweadner (Ann. Carn. Mus., XXV, 167-232) limited the distribution of columbia to include the region east of Winnipeg, Man., the northern shore of Lake Superior, the area around North Bay, Ont., and a small colony in Michigan and a similar one in Maine.