A systematic, zoogeographical and ecological survey of the composition
of the aphid faunas of Norway, Finland, Sweden and Denmark is given.
A total of 634 species have been recorded, most of them of western Pal
earctic origin. Some species have their borders of distribution here,
in several cases depending on the distribution of host plants. Some of
the species are boreo-alpine and some others have recently been intro
duced from other continents.