The adults of both sexes, pupa, and fourth-instar larva of Aedes (Aedimorphus) gandarai, a new species of the Tarsalis Group, are described and illustrated. The systematics of Ae. gandarai is discussed, as well as its affinities with the other species of the Tarsalis Group. Keys to all described females, male genitalia, larvae, and pupae of the Tarsalis Group are given.