A species of lower order streams and rivers, common in the Taconic Mountains and throughout the spine of the Green Mountains. Also found in streams of the Northern Piedmont and Northeast Highlands. As adults, small and easily overlooked. As larvae, relatively easy to find but almost impossible to tell from Southern Pygmy Clubtail (Lanthus vernalis). As a result, it is difficult to pinpoint differences in the habitats of these two species. Flight seasons for both species are compact and almost identical.
May 31 – July 16