Key to species of the M. bolivar species-group

1 Male with cercus and surstylus in lateral view not widely separated in lateral view (Bonatto & Marinoni, fig. 11); base of cercus not enlarged, without dense comb of setae (as in Fig. 37); ST5 of typical shape (Bonatto & Marinoni 2005: fig. 13)....... 2

- Male with cercus and surstylus widely separated in lateral view (Figs. 31, 33); base of cercus enlarged, with dense comb of setae posteriorly (Figs 31–34); ST5 of unusual shape (Figs 247–248)................................................. 3

2 Legs mostly brown, except femora orange with apical 1/4 reddish-brown; spiracles orange; wing infuscated along anterior edge of costa up to R 2+3; surstylus and cercus broader (Bonatto & Marinoni 2005: figs 13–14)...................... M. bolivar

- Legs, including femora dark brown; anterior spiracle yellow-orange, posterior spiracle dark brown; wing hyaline; cells near base of wing darkened, veins with faint darkening; epandrium with surstylus and cercus narrower (Wolff et al. 2017: figs 10–11)..................................................................................... M. carvalhoi

3 Tip of T5 orange in both sexes, larger in male. Male: epandrium orange (Fig. 492); terminalia as in Figs 31–32; female terminalia as in Fig. 291............................................................. M . epandrioaurantia sp. nov.

- Tip of T5 and epandrium shining blue, concolorous with rest of abdomen (Fig. 461); epandrium, cerci and surstyli as in Figs 33–34; [female unknown].............................................................. M. woodorum sp. nov.