A taxonomic revision of the Palaearctic members of the subgenus Lasius s. str. (Hymenoptera, Formicidae) Author Seifert, Bernhard text Soil Organisms 2020 2020-05-26 92 1 15 86 http://dx.doi.org/10.25674/so92iss1pp15 journal article 10.25674/so92iss1pp15 2509-9523 10832216 Lasius brunneus species complex Mean number of mandibular dents low (MaDe 900 7.0– 7.3). Dorsum and slope of propodeum in lateral view linear and forming a distinct, obtuse angle. Petiole scale in lateral view thin and forming an acute tip; its dorsal crest in anterior view straight, slightly concave or slightly emarginate. Pubescence on scape and tibiae and many other body parts very smooth, appressed. Mean length of pubescence hairs on frons very low (PLF 900 23.2–25.1 µm). Setae numbers on all body parts low (nOcc 900 + nGu 900 + nSt 900 <10). All species show affinities to habitats with trees. Five species: Lasius brunneus (Latreille 1798) , Lasius lasioides (Emery 1869) , Lasius himalayanus Bingham 1903 , Lasius silvaticus sp. nov. , and Lasius excavatus sp. nov.