A new species of Aegidium Arrow (Coleoptera: Scarabaeidae: Orphninae) from Colombia.

In the Neotropical Region, Orphninae (Coleoptera: Scarabaeidae) are represented by the endemic tribe Aegidiini, which comprises five genera and 49 species (Paulian 1948; Colby 2009; Frolov Vaz-de-Mello 2015; Frolov et al. 2017a, 2017b, 2017c, 2019). Aegidium Westwood is the largest genus of the tribe and it comprises 24 valid species known from the southern Mexico in the north to Central Bolivia in the south (Frolov et al. 2015; Rojkoff Frolov 2017; Frolov Akhmetova 2020).

Revision of the genus Athyreacarus (Acari: Athyreacaridae).

Mites of the genus Athyreacarus (Acari: Athyreacaridae) associated with bolboceratine beetles (Coleoptera: Geotrupidae: Bolboceratine) of New World are revised, a new generic concept provided, and the family concept modified. Nine new species are described: A. grandis sp. nov. on Neoathyreus lanuginosus in Brazil; A. magnificus sp. nov. on Athyreus tuberifer in Brazil; A. variabilis sp. nov. on Neoathyreus cf. anthracinus in Brazil; A. similis sp. nov. on Neoathyreus centromaculatus in Bolivia; A. vazdemelloi sp. nov. on Parathyreus rectus in Brazil; A. pusillus sp. nov. on Athyreus brasilicus in Brazil; A. latus sp. nov. on Athyreus cf. bifurcatus from unknown locality; A. angustus sp. nov. on Bolbelasmus horni in USA; and A. ovalis sp. nov. on Bolbelasmus variabilis in Mexico. Bolbapium striatopunctatum, B. minutum, and B. sculpturatum are recorded as new phoretic host beetles for Athyreacarus primitivus. A key to genera and species of the family Athyreacaridae is provided.

A new species of Formicomotes Sevastianov (Acari: Heterostigmata: Dolichocybidae) associated with termites (Isoptera: Termitidae) from Brazil, with redescription of Formicomotes octipes Sevastianov, 1980.

The new species Formicomotes brasiliensis sp. nov. (Acari: Heterostigmata: Dolichocybidae), phoretic on the termite genus Nasutitermes Dudley (Insecta: Isoptera) from Brazil, is described. The genus Formicomotes Sevastianov, 1980 is recorded from the Neotropical region for the first time. Formicomotes octipes Sevastianov, 1980 is redescribed based on type material collected on the ant species Lasius fuliginosus and new specimens from Crimea collected from forest litter.

A new species of the genus Madecorphnus (Coleoptera: Scarabaeidae: Orphninae) from Madagascar.

Madagascar has a unique and diverse Orphninae (Coleoptera: Scarabaeidae) fauna with four genera and 39 described species (Paulian 1977, Frolov et al. 2016). Half of these species belong to the genus Madecorphnus Paulian, 1992 (Paulian 1992, Frolov 2010a,b, 2012, 2014). The purpose of this paper is to describe a new species of Madecorphnus and provide a new record for M. dentatus Frolov, 2010.

Review of the Madagascan Orphninae (Coleoptera: Scarabaeidae) with a revision of the genus Triodontus Westwood.

The subfamily Orphninae (Coleoptera: Scarabaeidae) is reviewed from Madagascar. A total of four genera and 39 species were found, all being endemic to the island. The following five new species are described: Triodontus ankarafantsikae, Triodontus lemoulti, Triodontus viettei, Triodontus fairmairei, and Triodontus inexpectatus. The following new synonymies are proposed: Orphnus nigrita Brancsik, 1893 is synonym of Triodontus hova (Fairmaire, 1868); Triodontus occidentalis Paulian, 1977 and Orphnus obsoletus Brancsik, 1893 are synonyms of Triodontus nitidulus (Guérin-Méneville, 1844); Triodontus vadoni Paulian, 1977 and Triodontus perrotorum Paulian, 1977 are synonyms of Triodontus owas Westwood, 1852. Lectotypes are designated for the following names: Orphnus nitidulus Guérin-Méneville, 1844 and Orphnidius modestus Benderitter, 1914. Keys, descriptions, illustrations of habitus and male genitalia, and distributional records maps are given for all species.