Two new East Palearctic Agabus species of the adpressus- and confinis-groups (Coleoptera, Dytiscidae)

The Agabus adpressus-group is defined and Agabus udege sp. n. is described from the Sikhote-Alin mountain range in easternmost Russia. It is the sisterspecies of A. adpressus Aube, 1837. Some East Palearctic specimens previously assigned to Agabus discolor (Harris, 1828), A. clypealis (Thomson, 1867), and A. levanderi Hellen, 1929, in the literature are described as Agabus angusi sp. n. The new species is known from the Lake Baikal region and eastwards to NE Mongolia and northernmost China