Cnesia is a genus of 4 species of black flies. They are distributed in Argentina and Chile. Species C. dissimilis (Edwards, 1931) C. gynandrum (Edwards, 1931) C. ornata Wygodzinsky & Coscarón, 1973 C. pusilla Wygodzinsky & Coscarón, 1973 Literature cited Simuliidae Culicomorpha genera Fauna of Chile Fauna of Argentina Insects of South America