Have the chromosomes in the locust testes divided into chromatids?

Yes, in locust testes, as in other organisms, chromosomes undergo division and replicate to form chromatids during the cell cycle, specifically during the S phase of interphase. Each chromosome is duplicated, resulting in two sister chromatids held together at the centromere. During meiOSis, these chromatids will eventually be segregated into gametes, contributing to genetic diversity. Thus, in the testes of locusts, the chromosomes do indeed divide into chromatids as part of their reproductive cell development.