Anopheles (Anopheles) cucphuongensis, a new species, is described and illustrated in the adult, pupal and larval stages. Comparisons are made between this species and An. (Anopheles) alongensis. Based on those comparisons, the Anopheles alongensis group is proposed, consisting of two species: An. alongensis and An. cucphuongensis. The differences between this group and the An. culiciformis group are described.