The chromosome complement of the Horsfield's shrew, Crocidura horsfieldi (Soricidae--Insectivora) was studied and the diploid number established to be 2n = 38. Comparisons were made with other species of the genera.

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SummaryThe structural polymorphism in the karyotype of the acridid, Gastrimargus africanus orientalis is presented and the C-banding pattern of this species is compared with Acrida turrita and Aiolopus sp. 2 along with the percentage of heterochromatin in each species.

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The behavior of the sex chromosomes during meiosis in the house shrew, Suncus murinus, shows some interesting features. Both X- and Y-chromosomes are large and biarmed and have huge segments of C-band material in noncentromeric areas. A distinct chiasma is formed between the short arms of the X and Y chromosomes and the heterochromatic regions in the bivalents show desynapsis in the form of a bulge.