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The chromosomes of the Japanese weevil, Catapionus gracilicornis Roelofs have been investigated in Aomori Prefecture. Both hexaploid (6x=63) and decaploid (lOx=100) parthenogenetic races were found in Temma. The species is now known to have six parthenogenetic races, 2x, 3x, 4x, 5x, 6x, and lOx, as well as a diploid bisexual race. It was shown that pentaploid forms arose from hexaploid forms as I stated in 1980.doi:10.1266/jjg.58.613 fatcat:zjvtbbfiofeopo4fxuteifcgfq