Key to the species of Odontacrossus (based on DELLACASA et al. 2014)

1 Clypeal margin trapezoidal, laterally distinctly outwardly curved before reaching the genal sutures. Head and pronotum blackish, sides of pronotum shadily brownish, elytra more or less dark-brown. Claws as in Fig. 8. Length 5.5–6.8 mm. China (Xizang, Yunnan), Myanmar (Kachin) ......................... O. pseudoobenbergeri (ČERVENKA, 1995)

- Clypeal margin nearly semicircular, gradually arcuate before reaching the genal sutures ....................................................................................................................................... 2

2 Head relatively narrow; pronotum moderately transverse, dually, rather closely punctured; elytral interstriae almost flat. Head and pronotum piceous, the latter extensively yellowish laterally towards anterior angles; elytra entirely brownish or yellowish with juxtasutural interstria and lateral margin brownish. Claws as in Fig. 9. Length 4.5–5.5 mm. Nepal, India (Arunachal Pradesh, West Bengal) ............................. ...................................................................................... O. trisuliensis (SEBNICKA, 1986)

- Head relatively large; pronotum strongly transverse, dually, not closely punctured; elytral interstriae slightly but distinctly convex. Head and pronotum blackish; elytra entirely piceous-black or with the apex rather broadly dark reddish brown ................... 3

3 Head with epistoma feebly convex at middle. Head and pronotum more strongly and more densely punctured; aedeagus short, as long as metatibia. Claws as in Fig. 7. Length 5.0– 6.5 mm. China (Gansu, Sichuan)....................... O. obenbergeri (BALTHASAR, 1932)

- Head with epistoma nearly flat at middle. Head and pronotum more finely and more sparsely punctured. Aedeagus long, about 1.4 times as long as metatibia. Claws as in Fig. 6. Length 6.8–7.3 mm. Myanmar (Kachin), China (Yunnan) ................ O. esseri nov.sp.