抄録
1. The production of diploid males in the parasitic wasp, Habrobracon pectinophorae Watanabe was studied by using two recessive mutant characters, white and curved.
2. The frequency varied according to the hereditary factor involved. Higher frequency was obtained in the case when white was used than in other cases.
3. The fertility of diploid males is very high in this species as compared with the American species, H. juglandis. Especially high fertility was found in the case of curved. Therefore, the fertility of diploid males also depends on the hereditary factor involved.
4. The daughters of the diploid males laid many eggs which, however, failed to hatch, though embryos were formed within.
5. The chromosome complexes of all the types of males and females were studied. The diploidy of biparental males and triploidy of their daughters have been confirmed definitely. In the triploid females, haploid, diploid and triploid chromosomes seem to be mixed in the oögonial cells.
6. A gynandromorph with diploid male parts and a haplo-diploid mosaic male are described.
I wish to express my heartfelt gratitude to Prof. Dr. T. Komai for his suggestions and kind guidance during the course of this work. I am also indebted to Messrs. T. Hama, K. lyatomi, J. Sonan and M. Nakayama for their kindness in supplying me with the material.
