抄録
This experiment was planned to determine what kinds of bees contributed to the production of the seeds of red clover cultivated in the cage. The cage was covered with cheese cloth, and it was placed over the pair of isolated plants previous to their blooming. Five to ten individuals of bees were confined to each cage. Bombus wustneii chinganensis 〓, ♀, Eucera sociabilis Smith 〓, ♀ were the most effective pollinators in the cages. Andrena spp. and Apis indica japonica Radoszkowski were of little use in setting pods and seeds. The nectar sucking method of Bombus speciosus Smith 〓 was abnormal and it was least serviceable as the pollinator of red clover. Honey bees were observed gathering pollens, however, they sucked the nactar after beginning of the wilting of flowerheads. It was doubtless that B. muscorum L. 〓, B. jonellus Kirby 〓, B.diversus Smith ♀ and B. ignitus Smith ♀ were effective pollenizers of red clover.
