Arcynopteryx dichroa

Arcynopteryx dichroa (McLachlan, 1872) Notes Arcrynopteryx dichroa is commonly known as the Holarctic Springfly (Stark et al. 2012). This is a circumpolar, northern Holarctic species that was previously referred to in North America as A. compacta (McLachlan, 1872) (Kondratieff 2004, Teslenko 2012, Numanović et al. 2024). In North America, the distribution of this species extends from the central Rocky Mountains north to a broad belt from Alaska east to Nunavut, with isolated records from Lake Superior in Michigan, New York, New Hampshire, and Maine (DeWalt et al. 2024). Stewart (1990) reported a univoltine life cycle for this species in Alaska. Larvae of A. dichroa typically inhabit rocky streams and rocky, wave-swept lake shorelines. This species, however, has not been collected in New York since August 1905 (Fig. 38) at 530 m asl (Fig. 39). This sole report is from Old Forge in Level IV Ecoregion Acid Sensitive Adirondacks (58 aa) (Fig. 40 a) under the old name Perlodes lineata (Smith, 1917) (Needham and Claassen 1925). The New York specimen has also been referred to as. A. minor Klapalek, 1912 (Hanson 1942). Further surveys targeting suitable high elevation habitats in the Adirondacks are needed to determine its status in the state.