Hemileuca grotei diana
Packard, 1874

H. g. diana male, Perry Park Rd., Douglas Co., Colorado,
44mm, September 24, 1994, courtesy/copyright Charles Bordelon and Ed Knudson.

H. g. diana variation, 5 S of Wolfsburg, Douglas Co., Colorado,
50mm, October 8, 1987, courtesy/copyright Charles Bordelon and Ed Knudson.