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SUMMARY
The chromosome numbers and meioformulas of ten species and subspecies belonging to Tenebrionidae (Coleoptera) are presented. Nine species have 2n = 20 and 9 + Xyp meioformula. These chromosomal data agree with the modal number for the approximately 200 species of Tenebrionidae currently studied. The case of Blaps bedeli tones-salai Español is an outstanding exception since it presents 15 autosomal bivalents and a multiple sex-chromosome system. Such a departure from normality is discussed within a phylogenetic framework.