Abstract
Results of Goldschmidt ('34) indicated that neutral races of Lymantria dispar had never produced female intersexes in crosses with other races. The present paper deals with the results of gonadal transplantations accomplished between the neutral and strong races.
The 5th instar larvae were used for experiments. Using the larvae of the Noh.-A strain (the strong race from Noheji, Aomori Pref.) as a donor of gonads, ovarian and testicular transplantations were performed with the larvae of the Mi.-A strain (the neutral race from Miyazaki, Kyûshû). The host without gonadectomy received a pair of ovaries or testes from the donor. As shown in Tables 1 and 2, 22.0 per cent of the ovary-transplanted larvae and 28.8 per cent of the testis-transplanted larvae changed into adults.
Close morphological examination revealed that any appreciable change which may be attributed to the effect of the grafted gonads has never observed in the external sex characters of hosts.
