抄録
The chromosomes of two species of the Cicadidae and six species of the Cercopidae were studied in this investigation, with special regard to the morphology of the chromosomes and to the sex chromosomes.
The chromosomes of the Homoptera morphologically belong to the “Chromosoma pleuromiticum” after the nomenclature of Oguma (1942). The chromosomes arrange themselves on the metaphase plate in a circular manner which is usual throughout both. the Heteroptera and Homoptera. The sex chromosome is an X-O type in the Cicadidae, while in the Cercopidae the majority of species show an X-Y type.
The species herein studied and their chromosome numbers together with the sex chrosomes are listed in the appended table (Table 1).
