We review the taxonomy of the gryllacrids from a small genus Monseremus Ingrisch, 2018. Monseremus bellus (Tan & Wahab, 2018) comb. nov., previously described from Brunei Darussalam before the erection of Monseremus, is now added as a second known species in this genus. From a recent field trip, we also added new locality record for the type species Monseremus appendiculatus Ingrisch, 2018. First described from Mount Kinabalu in western Sabah, this species has now been reported also in Mount Silam in eastern Sabah. Males of the type species were also collected for the first time and are described here. Lastly, we provide a dichotomous key to separate these two species.