Abstract
1. The possible connexion between multiple sex-chromosome mechanisms and polyploidy in Forficulina,Gryllotalpa spp., Pentatomidae and Mantidae is discussed. 2. Forficula smyrnensis Serv. (2n = 21) has an X1X2Y mechanism and thus belongs to the group of Forficulina which combine tetraploidy with a multiple sex mechanism. 3. It is shown that an X1X2Y mechanism might arise as the direct result of a single paracentric inversion in the tetraploid (XX, YY) male germ-line.
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