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1. The male of Scaptocoris castaneus Perty (Hemiptera-Cydnidae) has spermatogonia with 26 chromosomes and primary spermatocytes with 12 autosomal tetrads plus an XY-complex.2. From diakinesis up to metaphase the tetrads consist of four distinctly separated chromatids, the two at each side being connected with one another by a thin thread.3. The sex chromosomes (X and Y), from leptotene onward, appear fused to one another in a plasmosome. They first separate at anaphase or a little earlier for going to opposite poles. Since we can sometimes disclose several chromatin corpuscles within the plasmosome, the genesis of the sexcomplex remains an obscure affair.4. Discussing the facts reported in this paper the author reinforces his conviction concerning the localized condition of hemipteran chromosomes.

Contribution of <i>Scaptocoris castaneus</i> to the Kinetochore Problem in Hemiptera