Broadly sympatric occurrence of two thief ant species Solenopsis fugax (Latreille, 1798) and S. juliae (Arakelian, 1991) in the East European Pontic-Caspian region (Hymenoptera, Formicidae) is disclosed Author Csosz, Sandor https://orcid.org/0000-0002-5422-5120 HUN-REN-ELTE-MTM Integrative Ecology Research Group, Pazmany Peter ave 1 / C, Budapest 1117, Hungary & Department of Systematic Zoology and Ecology, Institute of Biology, ELTE-Eoetvoes Lorand University, Pazmany Peter ave 1 / C, Budapest 1117, Hungary sandorcsosz2@gmail.com Author Seifert, Bernhard https://orcid.org/0000-0003-3850-8048 Department of Entomology, Senckenberg Museum of Natural History Goerlitz, Am Museum 1, 02826 Goerlitz, Germany Author Laszlo, Mark Department of Systematic Zoology and Ecology, Institute of Biology, ELTE-Eoetvoes Lorand University, Pazmany Peter ave 1 / C, Budapest 1117, Hungary Author Yusupov, Zalimkhan M. https://orcid.org/0000-0002-5149-9679 Tembotov Institute of Ecology of Mountain Territories of RAS, Nalchik, 360051, Russia Author Herczeg, Gabor https://orcid.org/0000-0003-0441-342X HUN-REN-ELTE-MTM Integrative Ecology Research Group, Pazmany Peter ave 1 / C, Budapest 1117, Hungary & Department of Systematic Zoology and Ecology, Institute of Biology, ELTE-Eoetvoes Lorand University, Pazmany Peter ave 1 / C, Budapest 1117, Hungary text ZooKeys 2023 2023-12-21 1187 189 222 http://dx.doi.org/10.3897/zookeys.1187.105866 journal article http://dx.doi.org/10.3897/zookeys.1187.105866 1313-2970-1187-189 78E4BBFE8A354A1D980E5D2EE913F6A8 1B034EECE7C6508598324DFB53B6E3AB Solenopsis (Diplorhoptrum) fugax var. scytica Santschi, 1934 [type investigation] Notes. This taxon was described from the Great Caucasus. Two syntype workers were investigated labelled " Solenopsis fugax . Latr. v. Solenopsis scythica Sant", "Alages Caucase, Mejunoff.", "ANTWEB CASENT 0913886"; depository NHM Basel. The placement of the worker type specimens within the S. fugax cluster has been shown in the analyses above.