Melanacrosathe, gen. nov. is described to include M. burmensis, sp. nov. fr
om northeastern Myanmar and M. siamensis, sp. nov. from northern Thailand.
The genus is postulated to be the sister-group to Acrosathe Irwin & Lynebor
g, 1981 which has a Holarctic distribution with at least 20 species and one
species in Taiwan. The peculiar aedeagal structure is described and illust
rated.