Ostrocerca truncata

Ostrocerca truncata (Claassen, 1923) Notes Ostrocerca truncata is commonly referred to as the Truncate Forestfly (Stark et al. 2012). The distribution of this species extends from Maine west to Ontario and south along the Appalachian Mountains to Alabama, with a westward extension to Kentucky and Indiana (DeWalt et al. 2024, Grubbs and Baumann 2023). Harper et al. (1991 b) and Grubbs et al. (2005) both reported a fast univoltine life cycle with a summer egg diapause for O. truncata. In New York, adults of this species have been collected from late March through mid-May (Fig. 18). This species occupies a wide range of elevations (26-570 m asl; Fig. 19) and occurs in smaller streams and springs in Level III Ecoregions Northeast Highlands (58), Northern Allegheny Plateau (60), and Eastern Great Lakes Lowlands (83) (Fig. 20 c).