Abstract
In the fourth generation of a pedigree stock selected for the absence of a black shield on the thorax, a few individuals appeared having dark specks on the sides of the thorax below the base of the wings. Thirty-two individuals with specks appeared to 167 without specks. Again from one set of the latter a new brood was obtained that gave 19 present to 286 absent, or 1 to 15. Isolated, the new type bred true. These were mass results, and might have been due to a few individuals in the culture transmitting the specks on the wings, while the majority of the individuals might not transmit this character. Isolated females, not virgins, gave the following proportions:
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