New and little-known bees of the genus Colletes Latreille, 1802 (Hymenoptera, Colletidae) from the Nakhchivan Autonomous Republic of Azerbaijan, with descriptions of two new species

Data on 14 species of the genus <i>Colletes</i> Latreille, 1802 collected in the Nakhchivan Autonomous Republic of Azerbaijan in 2018-2025 are provided. Among them, <i>Colletes perplexus</i> <b>sp. nov</b>. is described as new to science. <i>Colletes caskanus</i> (Strand, 1919), <i>C. glaber</i> Warncke, 1978 and <i>C. idoneus</i> Cockerell, 1922 are newly recorded from Azerbaijan and ten species are newly recorded from the Nakhchivan Autonomous Republic. Now 43 species of <i>Colletes</i> are known from Azerbaijan. As a result of its first discovery in Azerbaijan, the intraspecific variation of the variable <i>C. glaber</i> was examined through its range and the new species <i>C. quadratus</i> Kuhlmann, <b>sp. nov</b>. from southeastern Turkey is described.