Two New and Three Newly Recorded Species of Black Flies (Diptera: Simuliidae) from Sabah, Malaysia.

Two new black-fly species, Simulium (Gomphostilbia) guniki sp. nov. and S. (Nevermannnia) borneoense sp. nov., are described from adult flies emerged from pupae, collected from Sabah in Malaysia. S. guniki is assigned in the ceylonicum species-group, and is characterized by the darkened legs in the adults of both sexes, eight pupal gill filaments almost sessile, and the small postgenal cleft of the larva. S. borneoense, which is assigned to the feuerborni species-group, is most distinctive by having the four pupal gill filaments per side (in place of usual six filaments). In addition, three species of Simulium (Gomphostilbia) , i.e., S. dentistylum, S. parahiyangum, and S. sheilae, are newly recorded from Sabah.