Following the recent discovery of a new genus from Thailand, a new species of Leleja Gorochov 2016 was discovered from Sakaerat Environmental Research Station in the same province: Leleja khao sp. n. Despite their close proximity between their known distributions, Leleja khao sp. n. differs from the type species by the male genitalia and also their natural habitat. The female for the genus is also described here for the first time.