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The karyotype of male N. lugens has previously been reported as 2n=29 (1411+ X) giving an X O, X Y sex determining mechanism. However, this investigation revealed the alleged single X chromosome in the male consists of two elements of unequal length which separate reductionally in the first meiotic division and equa tionally in the second. From this, and by comparison with other X O species it was determined that N. lugens has an X Y sex determining system with a chromosome number of 2n=30(1411+XY) in the male.

The chromosomes of Nilaparvata lugens Stal. and some other Auchenorrhyncha.