Distribution of Ceratina bees was surveyed at various localities in Ishikawa prefecture from 1974 to 1977. Five species, C. japonica. C. flavipes. C. megastigmata, C. esakii and C. iwatai were obtained. C. japonica is distributed from the coastal zone up to 1500 m alt., C. flavipes and C. iwatai from the coastal zone up to 500 m alt. whereas C. megastigmata and C. esakii from 500 m to 1500 m altitude. In Mt. Iozen, three species, C. japonica, C. megastigmata and C. esakii, showed segregation in the use of nesting substrates according to body size, as already found among C. japonica, C. flavipes and C. iwatai on the campus of Kanazawa University. The interspecific relation among five species seems to be governed, to some degree, by this differential use of substrates linked with body size, nesting period, and altitudinal segregation between two medium species (megastigmata and flavipes), as well between two small species (esakii and iwatai).
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