More spotty than D. transversa in its distribution, associated primarily with larger rivers, which more than likely accounts for its lower altitudinal distribution. In the Champlain Valley, found only on the Poultney, Missisquoi and Lamoille rivers, but likely occurs on other rivers throughout the biophysical region. Larval records indicate it may be more widely distributed in the Northern and Southern Piedmont regions than formerly thought. Though normally seen cruising low, up and down the middle of rivers, it will occasionally be found flying low over roads as well.