Two new yellow-legged species of the genus Hybos from Vietnam (Diptera: Empidoidea: Hybotinae)

The genus Hybos (Hybotinae) is recorded from Vietnam for the first time with four species. Two species, Hybos medialis sp. nov. and H. vietnamensis sp. nov., are described as new to science while two species, H. hainanensis Yang, 2008 and H. serratus Yang et Yang, 1992, previously only known from China are recorded from Vietnam. These four species are all yellow-legged species. A key to the known species of Hybos from Vietnam is presented.