Abstract
1. A number of generations of Dysdercus howardi, Ballou, bred in the laboratory between 1932 and 1934 are compared with a similar number of generations bred from 1940 to 1941.2. There is found to be no significant difference in the length of the life-cycle in the two periods.3. There is a significantly greater number of adult female insects in the earlier generations of D. howardi (eleven generations).4. In the later generations there is a higher percentage of infertile eggs. The difference between the two groups of insects is highly significant.5. There is no significant difference in the percentages of nymphs becoming adult in the two periods.6. The differences in the numbers of adult insects and in the sex ratios obtained in 1932–34 and 1940–41 are found to be non-significant (twelve generations).
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