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Genus Nigronia - Dark Fishflies

Dark Fishflies Mating? - Nigronia serricornis - male black and white alien bug!  - Nigronia serricornis Nigronia serricornis Aquatic Larvae - Nigronia SCREECH - Nigronia serricornis Corydalidae ? - Nigronia fasciata - male Dark Fishfly - Nigronia fasciata ID Please - Nigronia serricornis
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Megaloptera (Alderflies, Dobsonflies, and Fishflies)
Family Corydalidae (Dobsonflies and Fishflies)
Subfamily Chauliodinae (Fishflies)
Genus Nigronia (Dark Fishflies)
Explanation of Names
Nigronia Banks 1908
Numbers
2 spp. total, both in our area(1)
Size
20-30 mm
Identification
key to spp. in(1) (both larvae and adults)
The easiest way to distinguish Nigronia fasciata from serricornis:
fasciata has a speckling of brown spots mostly on the base half of the white stripe on the forewing; lacking on serricornis.

Nigronia serricornis has a variable white band on the forewing, ranging from just a few white crossveins to a broad rectangular shape, there may be brown spots in the white costal area of the forewing but there typically will not be any brown spots in the rest of the white band, and the band will be opaque. The hindwing will have a strong to weak white band toward the apex and may have a weak white band toward the middle, and the rest of the hindwing will be a dark brown color. Will always have serrate antennae, deeper in males, shallower in females.

Nigronia fasciata has a consistent band on the forewing, it will always be broad and somewhat rectangular, it will typically have brown spots on the edge of the band closer to the base of the wing, and the band will be more translucent. The base of the hindwing will always be white, there will always be a strong white band toward the middle of the hindwing and there will usually be some white crossveins toward the apex of the hindwing. Females will have serrate antennae, males will have modified pectinate antennae. (Grant Schiermeyer's note here.
Range
e. NA; both spp. widespread, but N. fasciata is absent from the upper Midwest and Canada(1)
Habitat
Streams and nearby vegetation. N. fasciata tends to inhabit small streams with very good water quality(1)
Season
in NC, May at lower elevations, May-July at higher elevations(2)
Life Cycle
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.
Works Cited
1.A guide to the Megaloptera and aquatic Neuroptera of Florida
Rasmussen A.K., Pescador M.L. 2002. Florida Dept of Environmental Protection, Div. Water Resource Management. Tallahassee. iii+45 pp.
2.Insects of North Carolina
C.S. Brimley. 1938. North Carolina Department of Agriculture.