The subfamily Trigonurinae Reiche, 1866 is a monogeneric subfamily of the large family Staphylinidae with an Holarctic distribution. The genus was the subject of a revision (Blackwelder, 1941). Seven species are known from northern America (Blackwelder, 1941; Herman, 2001), two species from the western Palaearctic and two, recently described species from China (Schülke & Smetana, 2015; Kishimot...

The genus Leptophion Cameron, 1901, which belongs to the subfamily Ophioninae Shuckard, 1840, is recorded from Japan and the Palaearctic region for the first time based on two new species, L. parvus sp. nov. from Amamioshima Island and L. septentrionis sp. nov. from Yakushima and Amamioshima Island. A key to the Japanese and Taiwanese species is also provided.

The genus Margaiostus Stibick, 1978, previously known from North and South America, is recorded for the first time in the fauna of the Palaearctic region. M. sundukovi sp. nov. is described from the Far East of Russia. The position of this species within the genus and the distribution of Margaiostus are discussed.

Gamasiphis angaridis sp. n. is described from females and males collected from litter and soil in the North Asian part of Russia-Siberia and the Far East. This is the first species of the large genus Gamasiphis to be described from the northern Palaearctic Region. A key for the separation of females of the 11 recognisable species of Gamasiphis described in Eurasia is provided.

Two genera of Korean Orthocentrinae, Gnathochorisis and Symplecis, are reviewed, and keys to species of these genera are provided here. Two new species, Gnathochorisis fuscipes Humala & Lee, sp. n. and Gnathochorisis koreensis Humala & Lee, sp. n. are described from South Korea. The current state of the taxonomy of Eastern Palaearctic orthocentrines is briefly discussed.

The genera Foersteria Szépligeti, 1896 and Polydegmon Foerster, 1862 (Hymenoptera, Braconidae, Brachistinae) are recorded for the first time from China. A new species, Foersteria xinjiangensis Yan & Chen, sp. nov., is described and illustrated. A key to the Palaearctic species of Foersteria is given. In addition, Polydegmon sinuatus Foerster, 1862 is illustrated in detail for the first time.

Holarctic species Platypsyllus castoris Ritsema, 1869 previously noted in Palaearctic only Europe and European part of Russia is found Siberia (Russia, Altai Krai) for the first time. This was collected on Eurasian beaver (Castor fiber Linnaeus, 1758).

The dark-red spider mite, Tetranychus ludeni Zacher (Acari: Tetranychidae), is a highly polyphagous species and an important pest of economic plants belonging to the families Cucurbitaceae, Malvaceae, Fabaceae Solanaceae, growing in tropical subtropical regions. In Western Palaearctic, its distribution reports have recently come mostly from Mediterranean Basin, i.e. Portugal, Spain, Italy Israe...