Meg-aloptera
Guides
Sialis
Holarctic Alderflies
Sialis is a genus of alderflies in the family Sialidae, characterized by small, brown, heavy-bodied insects with forewings 10–20 mm long. The genus is distinguished from other Megaloptera by having fewer than fifteen square cells along the upper edge of the front wings. Adults are diurnal and active in late spring. Larvae are aquatic predators that develop over two years before pupating in shoreline soil.