Anthobiomorphus, a new genus of Anthophagini Thomson, 1859 (Coleoptera: Staphylinidae: Omaliinae), with description of two new species from China, India and Nepal.

A new omaliine genus assigned to the Anthobium group of genera of the tribe Anthophagini Thomson, 1859, Anthobiomorphus Shavrin Smetana, gen.n. is described. Two new species, A. rougemonti Shavrin Smetana, sp.n. (China, Yunnan) and A. makranczyi Shavrin Smetana, sp.n. (India: West Bengal and eastern Nepal) are described and illustrated. The main morphological features of the new genus and its taxonomic relationships with other related genera are briefly discussed. All available bionomic and distributional data and a key are presented.

A replacement name for Antobium crenulatum Shavrin amp; Smetana, 2019 (Coleoptera: Staphylinidae: Omaliinae).

Anthobium crenulatum Shavrin Smetana, 2019 was recently described based on the holotype deposited in the collection of M. Schülke, Museum für Naturkunde (Berlin, Germany), collected by him in Diancang Shan range in Yunnan, China (Shavrin Smetana, 2019). This species was included to the crassum-group erected by Shavrin Smetana (2019), together with other three species from China. Some time later after the description, A. Newton (Chicago) sent to us a letter (e-mail: 15.11.2019) where he noted that "…in your recent Anthobium paper you established a new homonym: A. crenulatum Shavrin Smetana 2019: 463 (preoccupied, junior primary homonym of Anthobium crenulatum Hatch 1957: 66)...". It is worth noting here that Anthobium crenulatum was described by Hatch (1957) from Oregon, USA. Therefore, a new replacement name is proposed under the Article 34.2 of ICZN.

The genera Agelosus Sharp, 1889 and Apecholinus Bernhauer, 1933 in Taiwan (Coleoptera: Staphylinidae: Staphylinini: Staphylinina).

The genera Agelosus Sharp, 1889 and Apecholinus Bernhauer, 1933 from Taiwan are treated. Agelosus auricomus sp. nov., the only representative of the genus in Taiwan, is described as new. Two species, Apecholinus imitator sp. nov. and Apecholinus canifer sp. nov., are described as new and the presence of Apecholinus fraternus (Fairmaire, 1891) in Taiwan is confirmed by additional records. A key to genera and species is presented.

A revision of Eastern Palaearctic Anthobium Leach, 1819 (Coleoptera: Staphylinidae: Omaliinae: Anthophagini). III. Consanguineum, crassum and reflexum groups, and an additional species of the fusculum group.

Three new species-group are established for eastern Palaearctic species of the genus Anthobium Leach, 1819: the consanguineum-group containing A. consanguineum Shavrin Smetana, sp.n. (China: Yunnan: Gaoligong Shan, Diancang Shan) and A. jaegeri Shavrin Smetana, sp.n. (Central Nepal: Kali Gandaki Valley); the crassum-group containing A. crassum Shavrin Smetana, sp.n. (China: Yunnan: Xue Shan, Haba Shan), A. crenulatum Shavrin Smetana, sp.n. (China: Yunnan: Diancang Shan), A. explanatum Shavrin Smetana, sp.n. (China: Sichuan: Gongga Shan), and A. farkaci Shavrin Smetana, sp.n. (China: Sichuan, Sabde); the reflexum-group containing A. reflexum (Reitter, 1891) (Middle Asia), A.deplanatum Shavrin Smetana, sp.n. (China: Sichuan: Erlang Shan), A. gaoligongshanense Shavrin Smetana, sp.n. (China: Yunnan: Gaoligong Shan), and A. kashmiricum (Cameron, 1941) (India: Kashmir). The species groups are defined, briefly discussed, and a key to the species included in each group is given. A lectotype is designated for Lathrimaeum reflexum Reitter, 1891. The subgenus Prionothorax Luze, 1905 is synonymized with the nominal subgenus of Anthobium. An additional species of the fusculum group is described: A. transversale Shavrin Smetana, sp.n. (China: Sichuan: Gongga Shan). The species of each species-group are (re-)described, illustrated, and their geographical distributions are mapped. Anthobium reflexum is recorded from Kyrgyzstan for the first time.

Prosoglypta, a new remarkable genus from Vietnam (Coleoptera: Staphylinidae: Omaliinae: Omaliini).

A new omaliine genus and species from northern Vietnam, Prosoglypta alesenkae Shavrin Smetana gen. et sp. nov., is described and illustrated. The main morphological features of the new genus and its taxonomic relations with other genera of the tribe Omaliini MacLeay, 1825 are briefly discussed.

A revision of Eastern Palaearctic Anthobium Leach, 1819 (Coleoptera: Staphylinidae: Omaliinae: Anthophagini). II. fusculum group, and two additional species of the nigrum group.

The fusculum-group of the genus Anthobium Leach, 1819 is defined and briefly discussed. It contains western-palaearctic A. fusculum (Erichson, 1839), with a new synonym Lathrimaeum mesasiaticum Kirschenblat, 1961 syn.n., and fourteen species from the eastern Palaearctic Region, nine of which are described as new: A. besucheti Shavrin Smetana, sp.n. (central and eastern Nepal), A. capitale Shavrin Smetana, sp.n. (China: Yunnan, Meili-Xue Shan), A. confucii Shavrin Smetana, sp.n. (China: Sichuan, Gongga Shan and Erlang Shan; Hubei, Daba Shan), A. cuccodoroi Shavrin Smetana, sp.n. (India: Uttar Pradesh), A.denticulatum Shavrin Smetana, sp.n. (central Nepal), A. laozii Shavrin Smetana, sp.n. (China: Yunnan, Diancang Shan, Yanmen), A. latissimum Shavrin Smetana, sp.n. (China: Yunnan, Gaoligong Shan), A. liliputense sp.n. (China: Sichuan, Emei Shan) and A. splendidulum Shavrin Smetana, sp.n. (China: Gaoligong Shan, Meili Xue Shan and Baima Shan). A key to the species of the fusculum group is given. Lectotypes are designated for Lathrimaeum cavicrus Champion, 1925 and L. monticola Cameron, 1924. Additionally, two Himalayan species of the nigrum group defined by Shavrin Smetana (2017) are presented: A. alticola Coiffait, 1977 comb.nov. (from Deliphrum) and A. flaveolum Shavrin Smetana, sp.n. (eastern Nepal). The key for the nigrum group was modified. All species are described/redescribed, illustrated and their geographical distribution is mapped. Several members of Anthobium are recorded for the first time from certain area: A. fusculum from Pakistan, A. altivagans (Cameron, 1941), A. cavicrus (Champion, 1925) and A. sociale (Cameron, 1941) from Nepal, and A. monticola (Cameron, 1924) from Pakistan and Nepal.

New species of the genus Amphichroum Kraatz, 1857 (Coleoptera: Staphylinidae: Omaliinae: Anthophagini) from China.

Eleven new species of the genus Amphichroum Kraatz, 1857 (Coleoptera: Staphylinidae: Omaliinae: Anthophagini) from China are described and illustrated: A. angustilobatum Shavrin Smetana, sp.n. (Yunnan: Meili Xue Shan), A. assingi Shavrin Smetana, sp.n. (Yunnan: Hengduan Mountains), A. longilobatum Shavrin Smetana, sp.n. (Sichuan: Erlang Shan), A. maculosum Shavrin Smetana, sp.n. (Yunnan: Diancang Shan), A. propinquum Shavrin Smetana, sp.n. (Sichuan: Gongga Shan), A. schuelkei Shavrin Smetana, sp.n. (Yunnan: Gaoligong Shan), A. rotundatum Shavrin Smetana, sp.n. and A. squamosum Shavrin Smetana, sp.n. (Sichuan: Daxue Shan, Gongga Shan), A. subaequale Shavrin Smetana, sp.n. (Shaanxi: Qing Ling Shan), A. subelongatum Shavrin Smetana, sp.n. (Sichuan: Erlang Shan, Daxue Shan), and A.tibetanum Shavrin Smetana, sp.n. (Tibet: Chola Mountains). A key to species known from China and distributional maps of all species are provided.

Review of the genera Agelosus Sharp, 1889, Apostenolinus Bernhauer, 1934 and Apecholinus Bernhauer, 1933 (Coleoptera: Staphylinidae: Staphylinini: Staphylinina).

A taxonomic review of the genera Agelosus Sharp, 1889, Apostenolinus Bernhauer, 1934 and Apecholinus Bernhauer, 1933 is presented, including taxonomic history of the genera, their descriptions and keys to the species where applicable. Each species is described and illustrated, and all available bionomic and distributional data are presented. Agelosus caerulescens sp.n. (Yunnan), A. distigma sp.n. (China: Zhejiang), A. haeckeli sp.n. (Nepal), A. longicornis sp.n. (Japan: Shikoku), A. nigricollis sp.n. (China: Beijing Municipality, Hubei, Sichuan; North Korea), and A. schillhammeri sp.n. (China: Hubei) are described as new.Xanthocypus J. Müller, 1925 is removed from synonymy with Ocypus Leach, 1819 and moved as a resurrected synonym to Agelosus Sharp, 1889 (stat.res.)Ocypus fraternus Fairmaire, 1891, Agelosus ohkurai Hayashi, 1973, Ocypus aglaosemanticus He Zhou, 2017, Ocypus liui He Zhou, 2017 and Ocypus pterosemanticus He Zhou, 2017 are transferred from Agelosus to Apecholinus Bernhauer, 1933 (comb.nov.), and Agelosus ohkurai and Agelosus pterosematicus are placed in synonymy with Apecholinus fraternus (syn.nov.).Staphylinus auroguttatus Cameron, 1932, Staphylinus bimaculatus Cameron, 1932 and Ocypus cameroni Smetana Davies, 2000 (replacement name for bimaculatus Cameron, 1932) are transferred from Ocypus to Agelosus (comb.nov.) and placed in synonymy with Agelosus sikkimensis Bernhauer, 1920 (syn.nov.).Agelosus brevipennis Naomi, 1983, described as subspecies of Agelosus carinatus (Sharp, 1874), is placed in synonymy with Agelosus carinatus (syn.nov.).Agelosus chinensis J. Li, 1992 is transferred from Agelosus to Apecholinus Bernhauer, 1933 (comb.nov.) and placed in synonymy with Apecholinus fraternus (syn.nov.).Agelosus fushunicus J. Li, 2015 is placed in synonymy with Ocypus coreanus J. Müller, 1925 (syn.nov.).Agelosus unicolor masaoi Hyashi, 1991 is elevated to species rank (stat.nov,).Lectotype is designated for Ocypus weisei Harold, 1877.

A revision of Eastern Palaearctic Anthobium Leach, 1819 (Coleoptera: Staphylinidae: Omaliinae: Anthophagini). I. Gracilipalpe, morchella and nigrum groups.

Three new species-groups are established for eastern Palaearctic species of the genus Anthobium Leach, 1819: Gracilipalpe-group containing A. gracilipalpe (Champion, 1920) (Uttaranchal, Nepal), A. daliense sp.n. (China: Yunnan, Diancang Shan) and A. nivale sp.n. (China: Yunnan, Gaoligong Shan). Morchella-group containing A. morchella sp.n. (China: Yunnan, Baima Shan), A. hydraenoides sp.n. (China: Yunnan, Meili Xue Shan) and A. puetzi sp.n. (China: Sichuan, Daxue Shan, Qionglai Shan). Nigrum-Group containing A. nigrum (Cameron, 1924) (Himalaya), A. anishchenkoi sp.n. (China: Gansu, Dalijia Shan), A. conjunctum sp.n. (China: Yunnan, Diancang Shan), A. densepunctatum sp.n. (China: Yunnan, Meili Xue Shan) and A. ivani sp.n. (Nepal: Bagmati; Bhutan). The species groups are defined, briefly discussed and a key to the species included in each group is given. Lectotypes are designated for Eudeliphrum gracilipalpe Champion, 1920 and Lathrimaeum nigrum Cameron, 1924. Species in each species-group are described/redescribed, illustrated and their geographical distribution is mapped. Members of the genus Anthobium are recorded for the first time from China and Bhutan, and Anthobium gracilipalpe is recorded for the first time from Nepal.

Revision of Hemiquedius Casey (Staphylinidae, Staphylininae) and a review of beetles dependent on beavers and muskrats in North America.

Based on newly discovered characters on the male genitalia, external morphology and an accumulation of ecological data, we revise the single member of the genus Hemiquedius. Two new species, H. infinitus Brunke & Smetana, sp. n. and H. castoris Brunke & Smetana, sp. n., from eastern North America are described, and H. ferox (LeConte), restricted to peninsular Florida, is re-described. Hemiquedius castoris is strongly associated with the microhabitats provided by nest materials of the North American beaver and muskrat. A key to the three species of Hemiquedius is provided and diagnostic characters are illustrated. We also review the beetles known to be obligate associates of beavers and muskrats, and discuss the potential role of these keystone vertebrates in beetle evolution and distribution. Based on nest-associated beetles and their closest living relatives, beaver and muskrat lodges may extend distributions northward by moderating winters, promote sympatric speciation and act as refugia against extinction of lineages on a broader timescale. Further research into these potential impacts by ecologists and evolutionary biologists is encouraged.

Nine new species of the genus Deinopteroloma Jansson, 1946 (Coleoptera: Staphylinidae: Omaliinae: Anthophagini) from China and Vietnam.

Nine new species of the genus Deinopteroloma Jansson, 1946 are described and illustrated: D. bisbisinuatum sp.n. and D. draco sp.n. from China, Sichuan (Gongga Shan), D. emeicola sp.n., D. minor sp.n., D. ruzickai sp.n., D. sextuberculatum sp.n. and D. yinyang sp.n. from China, Sichuan (Emei Shan), D. rougemonti sp.n. from China, Yunnan (Dehong Dai and Jingpo Autonomous Prefecture) and D. vesiculosum sp.n. from North Vietnam. Three species groups within the genus are identified and characterized and closely relationships among them are briefly discussed. A check-list and key to the species of Deinopteroloma are provided. The distribution of all described and recorded species is mapped. Additional records of D. spectabile Smetana, 1996 from Nepal are given.

New species and records of the genus Geodromicus Redtenbacher, 1857 (Coleoptera: Staphylinidae: Omaliinae) from Taiwan.

Two new species of the genus Geodromicus Redtenbacher, 1857 from Taiwan are described and illustrated: G. philydroides sp. n. (Nantou Hsien) and G. taiwanensis sp. n. (Kaohsiung Hsien, Hualien Hsien). Additional material and a new synonymy for G. ohkurai (Hayashi, 1992) = G. ohkurai yushanensis (Hayashi, 1992), syn. nov. are proposed. A key to species known from Taiwan is given.

The Taiwanese species of the genus Paraphloeostiba Steel, 1960 (Coleoptera: Staphylinidae: Omaliinae: Omaliini).

Paraphloeostiba formosana sp. n. from Taiwan is described. Paraphloeostiba sonani (Bernhauer, 1943) is redescribed, the lectotype of Phloeonomus sonani Bernhauer, 1943 is designated. Both species are illustrated. A key to the species of Paraphloeostiba Steel, 1960 of Taiwan is given.

DNA barcoding and regional diversity of understudied Micropeplinae (Coleoptera: Staphylinidae) in Southwest China: phylogenetic implications and a new Micropeplus from Mount Emei.

Extensive litter sampling at eight forested localities in Yunnan and Sichuan detected 381 specimens of Micropeplinae rove beetles. DNA barcoding data from 85 representative specimens were analysed to delimit species and infer their relationships. Statistical methods were implemented to assess regional species diversity of understudied Micropeplinae. The total number of sampled Micropeplinae species varied between 14 and 17, depending on a splitting versus lumping approach for allopatric populations. A single Micropeplinae species was sampled in six of eight studied localities, three species were found on Mount Gongga, while ten species were discovered on hyperdiverse Mount Emei in Sichuan. All Micropeplinae specimens from our samples belong either to the genus Cerapeplus, or to three other inclusive groups temporarily retained inside Micropeplus sensu lato. Each of the three groups potentially represents a separate genus: tesserula group, sculptus group and Micropeplus sensu stricto. A new species Micropeplus jason sp. n. from Mount Emei in Sichuan is described. Numerous illustrations introduce regional fauna and clarify the discussed morphological characters.

Oxybleptes davisi (Notman, 1924) in Minnesota (Coleoptera, Staphylinidae, Staphylininae, Xantholinini).

The occurrence of numerous male specimens of Oxybleptes davisi (Notman, 1924) near Duluth in northern Minnesota is reported, including the special collecting circumstances. This is the first record of Oxybleptes davisi in Minnesota, which extends the distributional range of the species considerably toward the west.

New Staphylinidae (Coleoptera) records with new collection data from New Brunswick and an addition to the fauna of Quebec: Staphylininae.

Forty-four species of Staphylininae are newly reported from New Brunswick, bringing the total number of species known from the province to 126. Quedius criddlei (Casey) is reported for the first time from Quebec. Bisnius cephalotes (Gravenhorst) is removed from the faunal list of New Brunswick due to a lack of supporting voucher specimens. Additional locality data are presented for seven species either recently recorded from the province or with few previous records and little habitat data. We provide the first documented records of Atrecus americanus (Casey), Quedius erythrogaster Mannerheim, Quedius labradorensis labradorensis Smetana, Quedius plagiatus (Mannerheim), and Neobisnius terminalis (LeConte) from New Brunswick. Collection and habitat data are presented and discussed for all species.

A new species of the genus Quedius Stephens, 1829, subgenus Microsaurus Dejean, 1833, from northeastern North America (Coleoptera, Staphylinidae, Staphylinini, Quediina).

The paper contains a description of a new species of the subgenus Microsaurus Dejean, 1833, of the genus Quedius Stephens, 1829, based on specimens from northeastern North America (Canada: Ontario, Quebec, New Brunswick; USA: New Hampshire).