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Summary Chromosomal analysis of 4 Egyptian species of family Buthidae (Androctonus australis, Androctonus bicolor, Androctonus amoreuxi and Androctonus crassicauda) have been studied. The 4 buthid scorpions species have the same diploid chromosome number of 2nϭ24. These species have a unique combination of cytogenetic features including holocentric chromosomes. Multivalent chromosomes of regular and irregular form were observed during the first meiotic division. To the best of the authors knowledge, these results are reported for the first time in Egypt.

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