Subgenus Topomyia Leicester, 1908

Subgenus Topomyia is currently defined solely by characters of the forelegs and genitalia of males (Thurman, 1959). As noted by Lee et al. (1988), the Australasian species of Topomyia cannot be placed with certainty in either subgenus Suaymyia or Topomyia based on these characters. Consequently, the following diagnosis may not apply to all species currently included in subgenus Topomyia, which may not be a monophyletic group.

DIAGNOSIS – Foretarsomere 2 as long as or shorter than foretarsomere 3 (unique); ungues equal and simple in both sexes (distinction from males of subgenus Miyagiella); tergum IX broad, with setae (unique); sternum IX with scales (distinction from subgenus Miyagiella) and setae; gonocoxite with conspicuous scales (distinction from subgenus Miyagiella), gonostylus usually attached apically (distinction from subgenus Miyagiella), attached subapically in To. gracilis, To. hardini, To. minor, To. pilosa and To. winter; gonostylar claw present (distinction from subgenus Miyagiella); claspette with dorsal lobe (unique); aedeagus elongate (distinction from subgenus Miyagiella); tergum X not evident (distinction from subgenus Miyagiella); paraproct developed as an independent elongate sclerite with pointed apex (unique); cercal setae present (distinction from subgenus Miyagiella and some species of subgenus Suaymyia). See genus Topomyia.