Abstract: A new ant species, Cataglyphis tartessica sp.n., is described based on the morphological traits of its workers, queens, and males. The species is endemic to Spain and phylogenetically closely related to Cataglyphis floricola Tinaut, 1993, of which C. tartessica sp.n. was previously considered to be a bicoloured morph. The more relevant aspects of the new species' natural history are also described.