Abstract
Flower-visiting habits of 6 species of the genus Megachile were examined during from April to October in 1952-1959. Two common species, M. tsurugensis and M. nipponica, have 2 or 3 generations a year. These bees have already developed ovaries at the time of emergence, and make flower-visiting in the complete form of request (request type A or B). The flowers of Leguminosae and Compositae were visited predominantly by M. tsurugensis and M. nipponica. Moreover, both species preferred such flowers as follows: Trifolium repens, Astragalus sinicus, Vicia unijuga, Lespedeza cyrtobotrya, Cirsium japonica, Aster sp., Erigeron annuus. The tube renting habits of M. tsurugensis and M. nipponica seem to be favorable for practical use as pollinators, because it is possible to protect and multiply these bees by means of artificial providing of their nesting sites.
