Abstract
Development of the testes and ovaries of the German cockroach, Blattella germanica (L.), was studied by dissection and micro technique using 1-day-old nymphs to 9-day-old adults. Spermatogonial divisions first occurred in the 4th-instar nymphs with motile sperm present in late 4th-instar nymphs. Spemlatogenesis continued throughout the 5th in star and was observed in the adult testes, although it was not so prevalent. Oogonial divisions were observed in 5th-instar nymphs, with the 1st egg chambers being formed late in this in star. Mature ova were not observed until after the final molt. Rapid growth of oocytes occurred from time of 1st formation until maturation.
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