Isogenoides frontalis

Isogenoides frontalis (Newman, 1838) Notes Isogenoides frontalis is commonly referred to as the Hudsonian Springfly (Stark et al. 2012). This species is very broadly distributed in Canada from Newfoundland-Labrador and the Atlantic Maritime Provinces west to Saskatchewan and parallel in the USA from Maine west to Minnesota (Kondratieff 2004, Sandberg and Stewart 2005, DeWalt et al. 2024). Hilsenhoff and Billmyer (1973) reported I. frontalis from small, high gradient streams in Wisconsin streams and suggested a univoltine life cycle. The limited, scattered reports of adults of this species in New York are available from mid- to late June (Fig. 38) at elevations ranging from 115-231 m asl (Fig. 39) from Level IV Ecoregions Eastern Adirondack Foothills (58 ac), Ontario Lowlands (83 c), and Mohawk Valley (83 f) (Fig. 40 e).