Tomareshairstreaks comprise about 10 species distributed from Europe and North Africa to Central Asia. The taxonomy of the genus is hampered by the absence of diagnostic characters by which specimens can be unambiguously assigned to species. Our investigation of morphology and DNA barcode variations within and betweenTomaresspecies shows that while well-defined species (T. ballus,T. mauritanicus,T. callimachus,T. desinensandT. fedtschenkoi) diverge, poorly characterized taxa (T. nogelii,T. nesimachus,T. dobrogensis,T. romanoviandT. telemachus) show very little to no differentiation in mtDNA. We reinstateTomares callimachusspp.hafis(Kollar, 1849) as a valid subspecies (stat. rev.) and propose taxatelemachusZhdanko, 2000 anduighuricaKoçak, Seven & Kemal, 2000 as synonyms ofT. romanoviandT. nogelii nogeliirespectively (syn. nov). We relegatePolyommatus epiphaniaBoisduval, 1848, recently revived as a valid subspecies ofT. callimachus, back to synonymy under the latter, and reconsider the status ofT. nogelii dobrogensis(Caradja, 1895) in the light of new molecular data. We use a nuclear gene (EF-1α) in addition to COI barcodes to reconstruct the phylogeny of the group.