Suwallia marginata

Suwallia marginata (Banks, 1897) Notes Suwallia marginata is commonly known as the York Sallfly (Stark et al. 2012). This species has been reported in Canada from New Brunswick and mainland Labrador west to Ontario and in the USA from Maine south to Georgia (Alexander and Stewart 1999, Surdick 2004, DeWalt et al. 2024). Surdick (2004) reported adult collections of this species from June to September. Our records from New York indicate a flight period extending from early June to late August (Fig. 26). This species has been recorded from streams ranging from 125-570 m asl (Fig. 27) from Level IV Ecoregions Catskill High Peaks (58 y), Northern and Western Adirondack Foothills (58 ab), Finger Lakes Uplands and Gorges (60 d), and Cattaraugus Hills (60 f) (Fig. 29 e). This species is likely more common in the state than current collections indicate.