The range of Ophiogomphus howei is primarily in the zones depicted as shaded areas in this map, which include river systems where O. howei has been found, but not all states within shaded areas have records of O. howei. Symbols represent: Diamond = single Ontario, Canada, record; triangle = single Mississippi River record in Minnesota; star = population newly discovered in Michigan; plus sign = new historical record also recently uncovered. (Image originally published in Craves et al 2020, Journal of Insect Science)