1990 年 55 巻 4 号 p. 543-546
Testicular cells of grasshopper, Poekilocerus pictus Fabr., were subjected to standard C-banding procedure. Number of bands per genome during pachytene, diplotene and diakinesis varied from 15-20. Chromosomes were well spread and countable at metaphase-I and anaphase-I; however, no C-bands were observed at these stages, which might be due to high condensation of chromosomes. The 2n number was found to be 19, (9II+X) and the sex determining mechanism to be of XO type. The mean chiasma frequency per cell was 16.40±0.41 at metaphase-I.