Key to the species of the genus Tropiorhynchus

1. Pronotum rugose, posterior angles acute; surface of pronotal disc densely setose (Fig. 10); outer claw of protarsus split apically (Fig. 34); outer claw of mesotarsus and metatarsus simple (Figs. 37, 41); all trochanters without teeth (Figs. 22–24); mesosternum produced; ventral plate of aedeagus with a raised lamina in middle (Fig. 49)............. T. orientis (Newman, 1838)

- Pronotum punctate, posterior angles blunt; surface of pronotal disc sparsely setose with a group of setae present near anterior portion of pronotum (Figs. 11–13); outer claw of protarsus and mesotarsus split apically (Figs. 35–36, 38–40), outer claw of metatarsus simple (Figs. 42–44); trochanters with or without tooth (Figs. 25–33); mesosternum not produced; ventral plate of aedeagus without raised lamina in middle (Figs. 50–52)....................................................... 2

2. Elytra black without longitudinal markings, sometimes with two yellow spots in middle (Figs. 15, 54); pronotal disc densely punctate, punctures large, edges of punctures near anterior portion of pronotum overlapping (Fig. 11); apex of parameres blunt at apex (in frontal view) (Fig. 46), ventral plate strongly curved in lateral view (Fig. 50).. T. podagricus (Burmeister, 1844)

- Elytra yellow with brownish-black markings (Figs. 16–17); pronotal disc finely punctate, punctures small, edges of punctures near anterior portion of pronotum not overlapping (Figs. 12–13); apex of parameres either pointed or blunt (in frontal view) (Figs. 47–48); ventral plate in lateral view relatively straight (Figs. 51–52)........................................ 3

3. Punctures on pronotal disc comparatively close (Fig. 12); pygidium dark brown, finely punctate in middle, rugose at sides (Fig. 20), setae tan; ventral plate of aedeagus filamentous, slightly curved apically with a strong beak-shaped, hooked process (Fig. 51); paramere tips pointed (in frontal view) (Fig. 47)................................ T. umbrinus Machatschke, 1954

- Punctures on pronotal disc fine, well separated (Fig. 13); pygidium black, smooth in middle, rugose at sides (Fig. 21), setae white; ventral plate of aedeagus nearly straight, apex without hooked process (Fig. 52); paramere tips weakly pointed (in frontal view) (Fig. 48).............................................. T. annandalei Gupta and Chandra, new species