During his stay in Java Mr. Edward Jacobson collected from 1909 to 1911 a small number of terrestrial Amphipoda which he has been good enough to hand over to me for identification. They all prove to belong to Orchestia parvispinosa, a species described from Java by Max Weber in 1892; Weber however had only female specimens and the male has remained unknown all these years. Mr. Jacobson’s collection consists nearly all of females, as is usually the case with collections of terrestrial Amphipoda, but fortunately it contains one male which, though apparently not fully mature, is sufficiently developed to give a general idea of its chief characteristics. I therefore give a brief description of its gnathopoda and add one or two items of additional information about the species and its relationship to allied species.