Deroceras johannae n.sp. and D. korthionensis n.sp. are described from the Isle of Andros, Greece. Distributional data of Limax aff. conemenosi Boettger, Tandonia sowerbyi Férussac, as well as of an unidentified milacid are provided. Attention is drawn to a peculiarity in the genital anatomy of L. aff. conemenosi, in comparison with specimens attributed to this species from outside Greece. The material has been deposited in ZMA.