Somatochlora metallica abocanica Belyshev, 1955, a new member of the European dragonfly fauna (Anisoptera: Corduliidae)

The Siberian S. m. abocanica is recorded for the first time in Europe, i.c. from SE Poland (Bieszczady Mts) and Finland (nr Raahe, Oulu Prov.). An identification key of the palearctic S. metallica group is presented, consisting of S. metallica with sspp. metallica, abocanica and exuberata, S.japonica and S.meridionalis. A tentative hypothesis on postglacial range expansion of S. m. metallica and abocanica is discussed, the latter being perhaps a Mongol-Kasakhian faunal clement. S. japonica is presumed a junior synonym of S. m. exuberata.