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The  Lygaeidae (Heteroptera) are a large and diverse family in which the  male diploid chromosomal complement ranges from 10 to 30. Diploid  numbers of 14 and 16 are taken as two modal numbers of the family. The  Rhyparochrominae, one of the largest subfamilies of the Lygaeidae, are  known to be heterogeneous both cytologically and morphologically.  Available data on the tribe Rhyparochromini reveal that all species are  characterized by the presence of a pair of microchromosomes  (m-chromosomes) and have an XY/XX (♂/♀) sex chromosome determining  system. Dieuches coloratus (Distant, 1909) and D. insignis (Distant, 1918) belonging to Rhyparochromini, have 2n=14=10A+2m+XY and 2n=12=8A+2m+XY  respectively. Both the species are similar inone pair of  distinctly large autosomes in their chromosome complements. The  metaphase plate arrangement of autosomes, sex chromosomes and  m-chromosomes in D. coloratus is similar to the common condition observed in the tribe Rhyparochromini. In D. insignis, however, the arrangement is different. Here, metaphase I is  usual in showing peripheral position of autosomes and central position  of sex chromosomes and m-chromosomes. At metaphase II, however,  autosomes, sex chromosomes and m-chromosomes are peripherally placed, an  arrangement, which is not reported earlier in the tribe  Rhyparochromini

Chromosomes and their meiotic behaviour in two species of Dieuches Dohrn, 1860 (Heteroptera: Lygaeidae: Rhyparochromini)