Key to genera of Mythicomyiinae of the world

(modified from Evenhuis 2002a)

1 Antenna with one flagellomere (Fig. 14). Stylus distal, tiny, inconspicuous (visible only in higher magnification); postcranium produced, subequal to eye length (Figs 12, 13).......................................... Tamanduamyia, gen. nov.

- Antenna with two flagellomeres and stylus placed apically (Fig. 2) or subapically on the second flagellomere (Fig. 21); postcranium not produced (Fig. 1)....................................................................... 2

2 Antenna with stylus placed apically on second flagellomere.................................................. 3

- Antenna with stylus placed subapically on second flagellomere (Fig. 21).......................................... 4

3 Vein A 1 complete, reaching wing margin (Fig. 22); costal vein incomplete, ending between R 4+5 and M 1 veins......................................................................................... Mythenteles Hall & Evenhuis

- Vein A 1 short, incomplete, reaching alular incision level; costal vein circumambient (Fig. 3)........... Mitinha, gen. nov.

4 Costal vein circumambient; cell dm fairly short, closed apically (Fig. 23)...................... Reissa Evenhuis & Baéz

- Costal vein incomplete, ending just beyond end of vein R 4+5. Cell dm much longer than wide (Figs 24, 25) or open apically. 5

5 Wing with well-developed keel-shaped anal lobe; vein separating basal cells not evident (Fig. 25); males holoptic................................................................................................ Mythicomyia ... 6

- Wing with anal lobe normal, not keel-shaped; vein separating basal cells distinct, often well sclerotized (Fig. 24); males dichoptic........................................................................................... 7

6 Males with secondary sexual character modifications on the legs (modified shapes of and notches in mid and/or hind legs and presence of pegs and large setae).......................................... Mythicomyia (Mythicomyia) Coquillett

- Males without secondary sexual character modifications of legs..................... Mythicomyia (Heterhybos) Brèthes

7 Wing with cell dm open, distal veins faint or effaced; head as wide as or wider than thorax......... Nexus Hall & Evenhuis

- Wing with cell dm complete (Fig. 22); distal veins not faint; head usually narrower than thorax........... Pieza Evenhuis