This volume treats part of the tribe Macrosiphini (family Aphididae, subfamily Aphidinae) with keys and descriptions of genera and species occuring in Scandinavia or expected to be found there in the future, with notes on distribution and biology and several drawings. An introduction to the tribe is given. The author does not agree with any proposed way to subdivide it into subtribes, but the sequence of genera is rather traditional, beginning with Anuraphis, Brachycaudus, Dysaphis, and supposed relatives. This volume also treats the Brevicoryne-group Coloradoa, Cavariella a.o., ending with some moss aphids. The Myzus- and Nasonovia-groups and part of the Macrosiphum-group will be treated in the fifth volume, the remaining part of the latter and the Megoura-group in the sixth volume together with the family Lachnidae. The book can be used for determination and gives a survey of the recent knowledge of taxonomy, biology and distribution. Like the other volumes it contains a catalogue showing occurrence of the species in Scandinavia, Britain and North Germany.