Taxonomy of the mediseorsa species group of the genus Nemophora Hoffmannsegg 1798 (Lepidoptera: Adelidae) Author Sun, Hao College of Life Sciences, Nankai University, Tianjin 300071, China Author Li, Houhun College of Life Sciences, Nankai University, Tianjin 300071, China & Key Laboratory of Biological Resources and Ecology of Pamirs Plateau in Xinjiang, Kashi 844000, China; College of Life and Geographic Sciences, Kashi University, Kashi 844000, China text Zootaxa 2023 2023-03-30 5258 4 485 494 http://dx.doi.org/10.11646/zootaxa.5258.4.9 journal article 10.11646/zootaxa.5258.4.9 1175-5326 7784653 ACF94546-2069-4AFB-B5CB-9417D9BB891C Key to species of the mediseorsa group of the genus Nemophora Hoffmannsegg 1. Forewing without basal black speckle, outer fascia narrowed medially ( Fig. 1 ).................. N. mediangusa sp. nov. - Forewing with basal black speckle, outer fascia separated medially............................................. 2 2. Digitate process arising from middle between base of costa and transtilla; phallus with banded process arising from distal 1/3 ( Fig. 8 )............................................................................. N. longiuga sp. nov. - No process present between base of costa and transtilla; phallus without process................................... 3 3. Uncus with papillary process posteromedially; vinculum 4.3 × length of valva ( Fig. 9 )............. N. longissima sp. nov. - Uncus without papillary process posteromedially; vinculum 2.5 × length of valva ( Fig. 10 )........ N. mediseorsa sp. nov.