According to available data, a total of 104 butterfly species have been recorded from SE Fennoscandia. The zoogeographical composition of the butterfly fauna is typical of western taiga. The leading role belongs, just like elsewhere, to the species widespread in temperate latitudes. The bulk of the fauna is butterflies of the boreal faunistic complex, most of which have a Euro_Siberian and Trans_Palaearctic distribution. The second most significant is the polyzonal complex, composed mainly of Trans_Holarctic and Trans_Palaearctic species. The Arctic and the Southern faunistic complexes are the poorest.