Mydidae
Diagnostic description:
Medium to very large flies, 9-60 mm long, usually sparsely pilose, and without bristles except on legs. Second flagellomere of antenna clubbed. Abdomen long, cylindrical, and slightly tapered apically in male, but usually widest at segment 4 in female. Hindleg much longer and stronger than midleg and foreleg; hind femur usually swollen, with ventral spines; hind tibia with apical spur or bristles. Wing long, narrow to wide; most veins ending in upper margin before apex. (Wilcox 1981)