@article{Andersson_Norén_Gelland Boström_2020, title={Träkägelbi Coelioxys alatus Förster, 1853 (Hymenoptera: Megachilidae) för första gången påträffad i Sverige}, volume={141}, url={https://et-online.nu/index.php/contents/article/view/35}, abstractNote={<p>During an insect inventory in the summer of 2019, a female <em>Coelioxys alatus</em> Förster, 1853 was caught in a pan trap close to Råstasjön in Solna. This is the first record of the species in Sweden. <em>C. alatus</em> is distributed across large parts of Europe and Asia but has always been considered as a rare species. The closest occurrences from a Swedish perspective are from Finland and Estonia, where the species seem to have increased in numbers during recent decades and possibly also expanded the distribution area westwards. <em>C. alatus</em> is a cleptoparasite on <em>Megachile ligniseca</em> (Kirby, 1802), which preferably nests in cavities in dead wood. A large share of the European records of <em>C. alatus</em> have been made at localities close to wetlands such as marshlands, ponds and rivers. Whether the Swedish record of <em>C. alatus</em> is the result of a westward expansion of the former distribution area or if it has arrived in Sweden with imported timber is currently unknown. It is, however, possible that <em>C. alatus</em> occurs at more sites, such as the eastern parts of Svealand.</p>}, number={3}, journal={Entomologisk Tidskrift}, author={Andersson, Petter and Norén, Lars and Gelland Boström, Veronica}, year={2020}, month={sep.}, pages={89–94} }