Phylogenetic position of genera Acrostilicus Hubbard and Pachystilicus Casey (Staphylinidae, Paederinae) and their redescription Author Żyła, Dagmara 0A7FEB0F-308C-4FDF-AD0D-8074BC69F0B3 Museum and Institute of Zoology, Polish Academy of Sciences, Wilcza 64, 00 - 679 Warsaw, Poland. Department of Invertebrate Zoology and Parasitology, University of Gdańsk, 80 - 308, Gdańsk, Poland. Department of Ecology, Evolution and Organismal Biology, Iowa State University, Ames, IA 50011, USA. zyladagmara@gmail.com Author Tokareva, Alexandra F2DB3539-310F-4453-81FA-A6BC0D5C885D Museum and Institute of Zoology, Polish Academy of Sciences, Wilcza 64, 00 - 679 Warsaw, Poland. Department of Invertebrate Zoology and Parasitology, University of Gdańsk, 80 - 308, Gdańsk, Poland. Department of Ecology, Evolution and Organismal Biology, Iowa State University, Ames, IA 50011, USA. alexan4tok@gmail.com Author Koszela, Katarzyna 06C16202-4569-4156-9FB1-EA4DEE14AE88 Museum and Institute of Zoology, Polish Academy of Sciences, Wilcza 64, 00 - 679 Warsaw, Poland. Department of Invertebrate Zoology and Parasitology, University of Gdańsk, 80 - 308, Gdańsk, Poland. Department of Ecology, Evolution and Organismal Biology, Iowa State University, Ames, IA 50011, USA. kat.koszela@gmail.com text European Journal of Taxonomy 2022 2022-05-09 819 1 1 22 http://dx.doi.org/10.5852/ejt.2022.819.1773 journal article 55622 10.5852/ejt.2022.819.1773 ad96f711-d952-4f41-8241-5646ea1751aa 2118-9773 6533014 6A5B371D-2A28-43C1-A6C3-12C8E7016515 Pachystilicus quadriceps ( LeConte, 1880 ) Fig. 3 Stilicus quadriceps LeConte, 1880: 178 (original description, key, notes). Pachystilicus quadriceps – Casey 1905: 227 (redescription). — Leng 1920: 104 . — Lucas 1920: 475 (genotype fixed). — Blackwelder 1952: 285 (notes). — Moore & Legner 1979: 112 . — Poole & Gentili 1996: 370 . — Newton et al. 2001: 387 (comment on taxonomic status). — Bousquet et al. 2013 : DwC-A database. Diagnosis Differs from P. hanhami by longer and denser setae covering body, longitudinal carina of basisternum more elevated. Additionally, median emargination of posterior margin of sternite VIII is deeper and broader than in P. hanhami , depth of emargination of ca ¼ of sternite length. Type material Lectotype (designated here) USA • ♂ ; “ Cal. / ♂ / Type 6584 / S. quadriceps Lec. / J.L. LeConte Collection ”; MCZ . Additional studied material CANADA – British Columbia • 1 spec. ; “ Mts. Between Hope and Okanagan B. C. Sept. 90 / F C Bowditch Coll. / Stilicus quadriceps Lec ”; MCZ . USA – California • 1 spec. ; “Cala / Coll Hubbard and Schwarz / quadriceps Lec ”; NMNH . – Massachusetts • 1 spec. ; “ Brookline Mass 4-14-88 / F. C. Bowditch Coll ”; MCZ . Redescription MEASUREMENTS. Body length: 5 mm ; forebody length: 2.75–2.90 mm . COLOURATION. Dark brown to reddish brown; head darker, legs and antennae reddish brown ( Fig. 3A ). HEAD. As in generic description (HL: 0.95–1.00 mm; HW: 1.0– 1.1 mm ), with antennomere 1 elongate, widest at tip; antennomeres 2–4 elongate; antennomere 5 weakly elongate; antennomeres 6–10 gradually becoming transverse; antennomere 11 elongate, 1.5 × as long as antennomere 10. THORAX. As in generic description (pronotal size: PL: 0.8–0.9 mm ; PW: 0.8–0.9 mm ; elytra size: EL: 1 mm ; EW: 1.1–1.2 mm ). ABDOMEN. As in generic description; sternite VII with apical margin straight. Distribution The species has previously been recorded from the following US states: California , Massachusetts , and Missouri ( Newton 2018 ). We newly report this species from the Canadian province of British Columbia.