抄録
The green rice leafhopper, Nephotettix cincticeps UHLER, was found to harbour three types of microorganisms. Two of them lodged either in the mycetocytes of mycetomes or the mycetocytes of ovarial pedicels, in which they were confined to the cytoplasm. They were identical with the symbiotic bacteria classified as a- and t-symbiotes by MULLER (1949).Both of them had vegetative and infectious forms respectively. The other microorganisms looked like ricettsia. They lived in almost all the tissues, and were found most frequently in the nuclei, although they were present in the cytoplasm as well. This type of micororganism was found also in sperms and oocytes, suggesting the transmission of the microorganisms from both parents to their progenies. These three types of microorganisms were apparently not pathogenic to their host, but their role in the host is still unknown.
