In the determination of the agro-entomological region according to the resemblance of outbreak type of a species, the author devised to adopt the climatological indorsment in order to establish the more rational division. In this paper the author made some consideration on the rice-plant borer (Chilo simplex Butler) and rice-plant leafhoppers (Nilaparvata lugens Stal and Sogata furcifera Horvath) in southern Japan, and found the high correlation between the common-ratio of outbreak years of the species and the resemblance of variation type, not mean value, of the important meteorological element for the species respectively. From these results the author emphasizes the dynamic climatic zone has important significance for establishment of the agro-entomological region mentioned above.
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