Abstract
1. 1. The amount of C-banded heterochromatin has been compared with various DNA fractions, determined by means of reassociation kinetics, in four lacertid species. 2. 2. A clear correlation was found between the amount of constitutive heterochromatin and that of highly repetitive and foldback DNA. 3. 3. There is evidence for the presence of “satellite”-like repetitive DNA in the C-bands of the species studied. 4. 4. There appeared to be a relationship between the variations in repetitive DNA and in heterochromatin and the phylogenesis of lacertids. 5. 5. The most ancient species showed less heterochromatin and a more heterogeneous DNA, while the more recent species had more heterochromatin and a greater amount of highly repetitive DNA.
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