Key to established species of Megabruchidius

(Figure 12)

1 Hind tibia with a long apical spur or mucro extending slightly beyond the middle of the first tarsal segment; pronotum subconical, very faintly sinuate laterally; females with narrower pygidial pits; pygidium of female narrower, longer than wide at the base; integument brown; pronotum with less pronounced gibbosity (Figs. 12 A–D)............. Megabruchidius tonkineus

- Hind tibia with a shorter spur or mucro, slightly longer than the coronal denticle but not exceeding the basal third of the first tarsal segment; pronotum campaniform, clearly sinuate laterally; females with wider pygidial pits; pygidium of female wider, as long as wide at the base; pronotum with more pronounced gibbosity (Figs. 12 E–H)........... Megabruchidius dorsalis