Key to the Kohnometopus species

1. Dorsum with clearly deep and large punctures, embolium distinctly broad, distributed in Taiwan ................ K. yangi

-. Dorsum with tiny punctures, embolium narrow.............................................................. 2

2. Scutellum with large dark marking, evaporatory area broad and not triangular, femur entirely yellowish-brown, distributed in Malaysia ............................................................................ K. yasunagai sp. nov.

-. Scutellum with clear V-shaped marking, evaporatory area distinctly triangular, femur partly pale and brown with dark annulations, distributed in Japan (Ryukyu Arc.)............................................................ K. fraxini