More common in Vermont than once believed. Scattered distribution includes rivers or streams with sandy substrates (occasionally silty substrates) at all but high elevations. Hunt et al. found this species in the Connecticut River, but declining in abundance from north to south. Adults seen flying at two sites where a stream had flooded or been diverted to flow along a nearby sandy road. May be more nutrient tolerant than other members of its genus. Adults can be obvious at certain sites, but the most effective method of detection is searching for larvae or exuviae on streamside vegetation and rocks. This species may be a potential candidate for removal from the list of SGCN.
Conservation Status
State: S3S4, Species of Greatest Conservation Need
Global: G4
Flight Period
July 4 – September 1
