[Summary]. The external features of the heads of insects comprised in the superfamily Cicadelloidea are described and they are shown to be extremely unstable in comparison with those of insects in the other superfamilies of the Auchenorrhyncha. By using a series of weighted characters an attempt is made to assess the evolutionary levels, and periods of geological origin, of the species selected for illustration. Possible homologies of the sclerites, sutures, and clefts, of the heads of leafhoppers are discussed.
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J. W. Evans (1975) studied this question.