ABSTRACT.Analysis of host plant data for the seventy‐one species ofDiaphorinashows the genus to be unusually polyphagous, the species developing on eighteen families of dicotyledonous angiosperms. Apart from the common Asian citrus pest,Diaphorina citri, a second citrus‐feeding species is described and discussed. This species belongs to theamoenaspecies‐group which is defined and a key to nine of the ten included species is given. Seven new species are described:flavipennissp.n. andnigripennissp.n. from East Africa onStrychnos usambarensis; huilasp.n. from Angola onPtaeroxylon obliquum; turnedsp.n., from South Africa (host unknown);orantiminasp.n. from Madagascar (host unknown);aubertisp.n. from Comoro Islands on citrus trees; andbispinulatasp.n. from Madagascar (host unk