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As a result of the integrative (morphology and DNA barcodes) revision of the Taiwanese species of the rove beetle genus Quedius belonging to the abnormalis group, in the subgenus Microsaurus, three valid hypogean species are reported for the fauna of this island: Quedius masuzoi Watanabe, 1989, Q. nishikawai Watanabe, 1991 and Q. adilus sp. nov. A new synonymy, Quedius masuzoi = Quedius chiangi Smetana, 1995 syn. nov., is established along with providing additional records, a larval description and bionomic information for this species. Finally, the biogeographic origin of the abnormalis group in Taiwan is discussed.
The Quedius mutilatus group, a very poorly known presumably monophyletic complex of wingless, possibly hypogean species confined to the Tien-Shan Mountains, is characterized as such for the first time. Newly available material clarified the identity of Q. mutilatus Eppelsheim, 1888 and Q. kalabi Smetana, 1995, each hitherto known from a handful of non-conspecific and vaguely georeferenced specimens only. Additional material is reported for Q. equus Smetana, 2014 and bionomics for all these four species of the group are summarized.