The taxa of the Aphis fabae group s.stu. are morphologically difficult
to separate or inseparable. Vertical starch gel electrophoresis of me
mbers of the Aphis fabae complex s.str. and s.l. was carried out to fi
nd specific isozymic characters. Analysis of the banding patterns of 1
7 genetic loci reveals that each of the 18 taxa investigated can be cl
early identified. A biochemical key is presented.