Notes on the chromosomes of Brachytrupes portentosus (Gryllinae, Gryllidae)

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It has been found that the chromosomes of Brachytrupes portentosus, the large brown cricket, vary in the number and form according to individuals. Tateishi ('31) found the following three chromosomal variations in this species; (a) 4V's+10 rods+ X, (b) 5V's+8 rods+X, and (c) 6V's+6 rods+X. While three other types, quite different from those of Tateishi ('31), were reported by Ohmachi ('35) in the same species, such as (a) 6V's+7 rods+X, (b) 19 rods+X and (c) 4V's+10 rods+X. In the three different individuals of the same species recently obtained in Taiwan, the present author observed two different chromosome complexes, one of which consists of 5V's+2J's+7 rods+X (Figs. 1-2; 5-6) and the other contains 5V's+2J's+7 rods +2m-chroms.+X (Figs. 3-4; 7-8).
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