EN
Monomorium perplexum sp. n. from Transcaucasus and Islands of Aegean Sea is described. M. dentigerim (Roger) and M. evansi Donisthorpe are redescribed; females and males of M. criniceps, Mayr. are described first. M. perplexum differs from species of scabriceps group (except M. muticum Emery from Burma) by the absence of the long acute denticles on the anterior clypeal margin; it differs from M. muticum by smooth dorsum and sides of promesonotum. M. dentigerim and M. evansi are excluded from scabriceps group and are united to the dentigerim group. Key of species of the two groups is compiled.