2 spp. total, both in our area(1)
e. NA; both spp. widespread, but N. fasciata
is absent from the upper Midwest and Canada(1)
Streams and nearby vegetation. N. fasciata
tends to inhabit small streams with very good water quality(1)
in NC, May at lower elevations, May-July at higher elevations(2)
Emergence of adults may be synchronized. Adults are diurnal (seen flying near streams) and also nocturnal, so come to lights. Eggs are laid on the underside of vegetation overhanging a stream. Larvae are aquatic, predatory. Perhaps take three years to mature in more temperate areas, such as West Virginia. Pupation occurs in earthen cells on the edge of streams.