G-banded karyotypes of four species of the genus Acomys from different loca
lities are described: Acomys cahirinus from Egypt, A. cineraceus from the S
udan, A. dimidiatus from Israel and A. minous from Crete. Diploid chromosom
e numbers vary considerably among these species, ranging from 2n = 36 to 2n
= 50. The variation is due to Robertsonian fusions and/or fissions. We con
structed a maximum parsimony tree using the common Robertsonian metacentric
s as characters.