Abstract
1. CHAMPY'S mitochondrial fixative after original formula has yielded most favourable results for chromosomes of Hemidactylus bowringii, and FLEMMING'S strong solution containing no acetic acid for those of Gekko japonicus.
2. Hemidactylus bowringii has 46 telomitic chromosomes intergrading from a long rod to a small dot, and Gekko japonicas 38 chromosomes, 4 large V-shaped and 34 telomitic ones of various sizes.
3. Concerning the original chromosome complex of the family Gekkonidae we have no decisive evidence as yet; however, between the chromosome complex of Gekko japonicus and that of Tarentola mauretanica, there seems to be such relationship that a V-shaped chromosome of the former corresponds with two non-homologous rodlike chromosomes of the latter.
4. The sex-chromosomes of the males of those geckos are two short rod-like ones of the homomorphic type. They are distributed equally into each spermatid through the meiotic divisions.
