Bridge-dwelling
Guides
Atherix
ibis flies
Atherix is a genus of 'ibis flies' in the family Athericidae, a small family closely related to Rhagionidae (snipe flies). Species occur across most of Europe and the Nearctic realm. Adults are medium-sized flies; larvae are aquatic predators. Females of some species exhibit distinctive clustering behavior, forming dense aggregations on bridge undersides where eggs are deposited.