The following new species from Borneo are described: Amarygmus aequalis n. sp., A. concolor n. sp., A. muscivorum n. sp., and Derosphaerus borneensis n. sp. For additional 27 species of the genus Amarygmus of which up to now no faunistic data were available for Borneo or only a few type specimens were known, relevant data are given, sometimes with supplementary morphological notes.