Boreostiba Lohse in Lohse et al., 1990: 190 (type species: Homalota sibirica Mäklin, 1880, by original designation).
Diagnosis. See Lohse et al. (1990).
Discussion. Lohse et al. (1990) included in the genus Boreostiba five species. Two of them, Boreostiba sibirica (Mäklin, 1880) (the type species) and Boreostiba frigida (J. Sahlberg, 1880) (see Discussion for that species), have a long, completely fused and tubelike bridge of the median lobe and enlarged condilites of the parameres. Two other species included in Boreostiba by Lohse (Lohse et al. 1990), Boreostiba hudsonica Lohse, 1990 (a junior synonym of Atheta parvipennis Bernhauer, 1907; see above) and Boreostiba campbelliana Lohse, 1990 lack these features of the aedeagus and are very similar to a species (Dimetrota smetanai Lohse, 1990) placed by Lohse in a different genus. The males of Boreostiba lagunae Lohse, 1990 are unknown but this species is more similar to Boreostiba campbelliana than to Boreostiba sibirica. Until a generic revision of Athetini is completed, Boreostiba hudsonica, Boreostiba campbelliana and Boreostiba lagunae are placed in Atheta.