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You can check the last segment under the abdomen to determine sex; in females, it's a single uniform shape, while in males it's broken into 2 smaller segments. I believe this applies to all roaches and works well for hissers without obvious pronotum horns :)

I keep: G. portentosa E. javanica G. caffrorum G. centurio P. nigra P. pennsylvanica S. lampyridiformis D. punctata P. septeptrionalis B. notulata E. posticus B. fusca "Dusky Cave" T. bernhardti E. pacifica C. schwarzi P. horaianus N. cf. propinqua L. verrucosa S. conserfarium P. americana...