Abstract
Cryptocercus punctulatus Scudder has 43 chromosomes in males, 44 in females (Mountain Lake Biological Station, Virginia), or 37 chromosomes in males, 38 in females (Highlands, N.C.). The difference appears to be due to a series of Robertsonian changes (centric fusions). Male meiotic cells have 18 or 21 bivalents and an unpaired heterochromatic X chromosome. C. punctulatus , a presocial cockroach presumably similar to the evolutionary ancestors of termites, thus does not have the multiple sex-chromosome system characteristic of many of the lower termites, but does share with them a tendency toward centric fusions and chromosomal polymorphism within species.
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