Key to species of Dinomachus from Laos, Thailand and adjoining countries

1 Basal half of corium grey or brown....................................................................... 2

- Basal half of corium white or subhyaline................................................................... 3

2 Labium attaining mesocoxae, apex of segment III attaining midpoint between procoxae and mesocoxae; lateral margin of anterior lobe of pronotum almost straight; pale spot on apical part of scutellum obscured........................ D. rhacinus

- Labium attaining sternite V, apex of segment III attaining metacoxae; lateral margin of anterior lobe of pronotum weakly convex; pale spot on apical part of scutellum distinct................................................. D. sikhimensis

3 Body covered with long erect setae; posterior pronotal width as wide as width between apex of corium........... D. indicus

- Body covered with short decumbent setae; posterior pronotal width 1.5 times wider than width between apex of corium.... 4

4 Body length less than 8.0 mm................................................................. D. bengalensis

- Body length more than 8.0 mm.................................................................. D. superbus