Twenty aphid species are recorded from Kenya and Tanzania. Eonaphis crotonis Quednau is new to East Africa; Aphis fabae subsp. solanella Theob. and Macrosiphum rosae L. are new to Tanzania. New host-plant records are added to some of the species. The male of Neophyllaphis grobleri Eastop is descriptionbed for the first time and measurements of other morphs of this species and of the little known Eonaphis crotonis, previously found only once, are given.