Strophopteryx fasciata

Strophopteryx fasciata (Burmeister, 1839) Notes This species is commonly referred to as the Mottled Willowfly (Stark et al. 2012). Strophopteryx fasciata is a widespread and common late winter to late spring emerging species (Stewart 2000, DeWalt et al. 2024). The North American distribution of this species spans from Manitoba and North Dakota to the eastern coast, south to the Ouachita Mountains of Arkansas and east to Georgia (DeWalt et al. 2024, Stewart 2000, Verdone et al. 2017). Harper and Hynes (1971 c) reported S. fasciata from large streams and rivers in southern Quebec and Ontario. Previous studies of this species have indicated a fast univoltine life cycle with larvae undergoing a summer autumn diapause similar to Oemopteryx (Harper and Hynes 1972, Harper et al. 1991 a). In New York, adults of this species have been collected from mid-March through late May (Fig. 22), from elevations ranging from 33-464 m asl (Fig. 23) and are widely distributed across the state (Fig. 24 c).