Abstract
1. In Drosophila bifasciata, a wild species distributed widely in “transpalaearctic” regions, the correspondence between the karyotype and nine elements in the salivary gland chromosomes is discussed.2. A composite map of the standard gene arrangement of the salivary chromosomes is drawn.3. Descriptions of eleven different inversions detected in the salivary cells of geographic strains are given.4. Qualitative variations of the gene arrangements from different geographical regions are preliminary investigated.We wish to express our thanks to Drs. Jean and Katsuma Dan for reading the manuscript.
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