Subgenus Grimshawomyia Hardy, 1965

22. Last segment of vein M sinuate; wing infuscated along all veins, but centers of all cells hyaline except for r1 and apical third of r2+3. Hawai‘i ............................................ S. (Grimshawomyia) undulata (Grimshaw)

- Last segment of vein M not sinuate; veins lacking infuscation on basal half of wing; cell r2+3 almost completely infuscated beyond r–m crossvein and cell r4+5 infuscated directly anterior of dm–cu crossvein..23

23. Clypeus and lower margin of face yellow; wing with distinct pattern, apex lightly infuscated; two reclinate orbital setae present on frons; coxae predominantly yellow; foretarsi brown to black; third costal section shorter, roughly 2.5 times longer than fourth; each pleuron with a broad, transverse yellow vitta, lower 1/2 of katepisternum yellow, surstyli longer than wide, each with a row of fine teeth on venter. Hawai‘i ..................................................................................... S. (Grimshawomyia) perkinsi (Grimshaw)

- Clypeus pale brown; lower margin of the face predominantly brown, with a thin band of yellow; wing pattern similar to above, but with hyaline area at apex; three distinct reclinate orbital setae present on frons; coxae brown; foretarsi yellow; third costal section longer, about 3.5 times longer than fourth; pleura almost entirely brown, lacking distinct vittae; surstyli plainly visible, evenly rounded on ventral surface, lacking conspicuous teeth. O‘ahu, Maui ............................................. S. (Grimshawomyia) palata (Hardy)