Diamesa leona subgroup

Adult males of this subgroup have large and heavily chitinized, often bent over the dorsal side hypopygium; tergite IX with delicate pubescence of microtrichia directed anteriorly, with long and wedge-shaped or short anal point, angled downwards and covered in basal part with numerous microtrichia forward and laterally directed. Gonocoxite long, broad, with numerous short, anteriorly-directed setae and with slight broad ridge antero-dorsally; inferior volsella with rare exceptions absent; superior volsella in form of angular tubercle or collar. Gonostylus slightly curved, with numerous, proximally directed strong setae, in apical part with 1 megaseta and sometimes 1 tooth. Transverse sternapodeme triangular, with a spire-shaped apex.