Two new species of the genus Macrocheilus from Cambodia (Coleoptera: Carabidae, helluonini)

Two new species of Macrocheilus hope, 1838 from Cambodia (M. cambodianus sp. nov. and M. walterrossii sp. nov.), similar in external morphology to Macrocheilus chaudoiri Andrewes, 1919, are described. Moreover, the holotype of M. ruficollis heller, 1923 (= M. chaudoiri) is illustrated. A key to the species of Macrocheilus from the Oriental region with reddish pronotum and two pale spots on each elytron is also provided.