ヤマトゴキブリに関する研究 (1)

概要

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For the purpose to know the differences of shape or size of the egg and sexual behaviors by the living condition of the cockroach, Periplaneta japonica, the females were separated in two groups, one group contained females only and another group contained both sexes. The results obtained by the observations on these two groups, Group A the former one and Group B the latter one, were as follows : 1. Prematuration period was about 11 days in these two groups. 2. Period of egg stage in the egg sheath of A was about 32 days and two days longer than B's under the temperature of 22.2 to 29.9℃. 3. Interval of ovulation of A was 6 days and also two days longer than B's under the condition of 23.1 to 29.1℃. 4. Average number of eggs ovulated by A was a half of those of B but no difference of the size of egg sheath was observed. 5. More number of abnormal shape of egg sheath were observed in A and these egg sheath only were eaten by the roaches.
1964-10-31