A new species Arctoseius wisniewskii sp. nov. (Acari: Ascidae) is described and illustrated. It was found in litter and soil from rock cracks in the Góry Stołowe National Park in Poland.
Antennoseius (Vitzthumia) ventrianalis sp. nov. is the second species of Antennoseius described from Australia (Acari: Ascidae). It is described from non-phoretic specimens collected from the soil surface. The new species is unique in having three pairs of ventral setae on the ventri-anal shield; the maximum observed in other species is two pairs. It is sexually dimorphic in the degree of fusion of the podonotal and opisthonotal shields and some other minor characters.