Key to Micropezidae of Mauritius

1. Katepisternum with vertical row of at least 10 setae along posterior margin (Fig. 1H). Surstylus absent. Wing membrane either dark with circular clear maculae over crossveins or mostly hyaline with transverse discal band........................ 2

- Katepisternum with 2–3 large posterodorsal setae and a few lower setae in loose cluster, not forming a row. Surstylus present (Fig. 1D). Wing membrane almost entirely dark except for narrow transverse clear discal band (sometimes reduced or broken) (Fig. 1C)......................................................... Paraeurybata taeniata (Macquart), n. comb.

2. Wing membrane dark with circular, clear maculae over crossveins (Fig. 3A).................................................. Courtoisia apicalis (Macquart) (rare, possibly extinct; known from Réunion and one specimen from Mauritius)

- Wing membrane mostly clear with transverse discal band (Fig. 1G)............................................................................ Mimegralla splendens (Wiedemann) (coastal Mauritius, probably introduced from India)