Simulium (G.) bakalalanense, is described based on male, pupa and larvae collected in Mount Murud, Sarawak, Malaysia. S. (G.) bakalalanense sp. nov. is placed in the S. batoense species-group and is distinguished from most of known species of the group by the pupal gill with an inflated basal fenestra, shoe-shaped cocoon, and lack of grapnel-shaped hooklets on the pupal abdominal segment 9. Three known species, S. (G.) terengganuense Takaoka, Sofian-Azirun & Ya’cob from Peninsular Malaysia, S. (Simulium) alberti Takaoka from Sabah, and S. (S.) beludense Takaoka from Sabah, are newly recorded from Sarawak.