Gauromydas heros can reach a length of and a wingspan of about . It is the largest fly known. The wing membrane is whitish, brown or orange, with a hyaline apex and a posterior margin. ==Biology==
Biology
Adult males are flower visitors, while females do not feed at all. Larvae live in the nest of ants (Atta species), feeding on immature insects. Mature larva dig a pupation chamber in the soil, then the imago emerges. ==See also==