Paracapnia opis

Paracapnia opis (Newman, 1839) Notes Paracapnia opis is commonly known as the Northeast Snowfly (Stark et al. 2012). This species is distributed from Quebec and Newfoundand-Labrador south to an isolated locality in West Virginia and west to Minnesota (Stark and Baumann 2004, DeWalt et al. 2024). This species appears to be more common north of New York (Stark and Baumann 2004). Delucchi and Peckarsky (1989) supposedly studied the life history of P. opis in an intermittent stream in Tompkins County and found that larvae survive the dry season by migrating to the hyporheic zone or riffles that remain wet throughout the season. However, because the only available records for New York are from Level IV Ecoregions Acid Sensitive Adirondacks (58 aa), Central Adirondacks (58 ad), and Champlain Lowlands (83 b) (Fig. 12 f), it is likely that their study pertains to the more common P. angulata. In New York, adults have been reported from late March to late May (Fig. 7) from cold streams and rivers at 214-548 m asl (Fig. 9).