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A remarkable new apterous genus of Xanthopygina beetles is described here as Ikaros gen. nov. The new genus includes three new species, I. apteros gen. et sp. nov. from Colombia, I. paramo gen. et sp. nov. from Colombia and I. polygonos gen. et sp. nov. from Venezuela. Phylogenetic analyses using molecular and morphological data were performed to assess the phylogenetic position of Ikaros gen. nov. and whether the three new taxa formed a monophyletic group. All analyses, including those with aptery-associated characters removed, strongly supported the monophyly of Ikaros gen. nov. The genus could not be confidently resolved as a member of any of the existing genus-group lineages, likely due to a lack of morphological signal in the backbone of the tree. Further analyses, ideally with molecular data, are needed to determine the position of Ikaros gen. nov.
A new cryptic species, Aleochara (Xenochara) castaneimarmotae Klimaszewski, Webster, and Brunke, new species (Coleoptera: Staphylinidae: Aleocharinae), associated with Marmota monax (Linnaeus) burrows and caves in eastern North America, is described and illustrated. A key to Canadian species of subgenus Xenochara Mulsant and Rey and revised distributions of the taxonomically difficult fumata species group are provided. Aleochara quadrata Sharp is recorded from Washington and Oregon for the first time.
A taxonomic review was conducted of the type material of Quedius rove beetles (including Indoquedius, previously a subgenus) described by Otto Scheerpeltz from the 1934 Swedish expedition by René Malaise to Kambaiti, Myanmar. The specimens were mistakenly thought to be lost or compromised during the Second World War, and so the corresponding available names were not considered in the extensive taxonomic study of Quedius from the Himalayan Region and mainland China that has followed. This has resulted in the following synonyms: Indoquedius nonparallelus Zhao & Zhou, 2010 syn. nov. = I. malaisei (Scheerpeltz, 1965); I. baliyo Smetana, 1988 syn. nov. = I. micantiventris (Scheerpeltz, 1965); I. sanguinipennis (Scheerpeltz, 1965) syn. nov., I. bicoloris Smetana, 2014 syn. nov. = I. parallelicollis (Scheerpeltz, 1965); Quedius cornutus Cai et al., 2015 syn. nov. = Q. rutilipennis Scheerpeltz, 1965; Q. sundar Smetana, 1988 syn. nov., Q. hecato Smetana, 2012 syn. nov. = Q. semilaeviventris Scheerpeltz, 1965; Q. kambaitiensis Scheerpeltz, 1965 syn. nov. = Q. muscicola Cameron, 1932. The species collected by Malaise were treated within the most recent phylogenetic context, resulting in Malaisdius gen. nov., M. ruficeps (Scheerpeltz) comb. nov., and new or revised morphological concepts for the Apicicornis and Masasatoi species groups of Quedius (Microsaurus), and the Muscicola group of Quedius (Raphirus). Malaisdius smetanai gen. et sp. nov. is described from Nepal.