Key to all known species of the genus Megaodynerus

1. Clypeus slightly wider than long (about 1.1 times) with basal half yellow (Fig. 78); T1, excluding yellow area, coarsely punctate and strongly reticulate (Fig. 83); T2 with two large lateral spots connecting apical band (Fig. 83)......................................................................................... M. bimaculus Bai, Chen & Li, sp. nov.

- Clypeus much wider than long (1.4 times), wholly black (fig. 8 in Gusenleitner, 2012); basal half of T1 coarsely punctate and somewhat reticulate (fig. 9 in Gusenleitner, 2012); T2 without lateral spots................ M. maximus Gusenleitner, 2012